Yongjae Lee

Yongjae Lee
Yonsei University · Department of Earth System Sciences

PhD

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221
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4,623
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Publications

Publications (221)
Article
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Synchrotron X-ray powder diffraction experiments were performed on natural pollucite to observe its transition into hexacelsian-like phase at high pressure and temperature conditions under water pressure medium. When heated to 100 °C at 1.3(1) GPa, the natural cubic pollucite, (Cs, Na)16Al16Si16O96 (Ia3¯\documentclass[12pt]{minimal} \usepackage{ams...
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Manganese oxides are ubiquitous marine minerals which are redox sensitive. As major components of manganese nodules found on the ocean floor, birnessite and buserite have been known to be two distinct water-containing minerals with manganese octahedral interlayer separations of ~7 Å and ~10 Å, respectively. We show here that buserite is a super-hyd...
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Water-rich planets exist in our Solar System (Uranus and Neptune) and are found to be common in the extrasolar systems (some of the sub-Neptunes). In conventional models of these planets a thick water-rich layer is underlain by a separate rocky interior. Here we report experimental results on two rock-forming minerals, olivine ((Mg,Fe)2SiO4) and fe...
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Probing of reactive materials such as H 2 O ices and fluids at the high pressures and temperatures of planetary interiors is limited by unwanted chemical reactions and confinement failure. Faster experiments can mitigate such issues, but the common approach of adiabatic compression limits the conditions achieved. This study demonstrates a fast expe...
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The ultrafast synthesis of ε-Fe3N1+x in a diamond-anvil cell (DAC) from Fe and N2 under pressure was observed using serial exposures of an X-ray free electron laser (XFEL). When the sample at 5 GPa was irradiated by a pulse train separated by 443 ns, the estimated sample temperature at the delay time was above 1400 K, confirmed by in situ transform...
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The blueschist to eclogite transition is one of the major geochemical–metamorphic processes typifying the subduction zone, which releases fluids triggering earthquakes and arc volcanism. Although glaucophane is an index hydrous mineral for the blueschist facies, its stability at mantle depths in diverse subduction regimes of contemporary and early...
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Albite is one of the major constituents in the crust. We report here that albite, when subjected to hydrous cold subduction conditions, undergoes hitherto unknown breakdown into hydrated smectite, moganite, and corundum, above 2.9 GPa and 290 °C or about 90 km depth conditions, followed by subsequent breakdown of smectite into jadeite above 4.3 GPa...
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Available online xxxx Editor: J. Brodholt Keywords: hydrous iron oxide lower mantle crystal structure hydrogen The amount of hydrogen stored in the Earth's interior is important for a range of issues, including the volatile incorporation during the Earth formation and the co-evolution of the atmosphere, the hydrosphere, and the interior. Recent exp...
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Plain Language Summary The heat stored in the Earth's deep interior has been the primary fuel for a range of global processes from mantle convection to surface tectonics, but quantitative estimation of the heat remains uncertain. The melting temperature of mantle materials is one of the key parameters to understanding the thermal evolution and pres...
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A novel strategy of using hydrostatic pressures to synthesize gold–carbon (Au–C) nanohybrid materials is explored. The stable face-centered-cubic (fcc) Au undergoes a structural phase transition to a mixture of primitive orthorhombic and cubic phases as the carbon phase acquires a highly ordered onion-like carbon (OLC) structure which encapsulates...
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The structural stability and guest occupation behavior of argon-loaded hydroquinone (Ar-HQ) clathrates after γ-irradiation were investigated through a suite of diffraction, spectroscopic, and thermogravimetric methods. Ar-HQ, synthesized via the gas-phase reaction method at 12 MPa for 10 days showed complete structural transformation from pure α-fo...
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Superconductivity near room-temperature in the sulfur-hydrogen system arises from a sequence of reactions at high pressures, with x-ray diffraction experiments playing a central role in understanding these chemical-structural transformations and the corresponding S:H stoichiometry. Here we document x-ray irradiation acting as both a probe and as a...
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Pressure-induced hydration of the clay mineral nacrite, Al2Si2O5(OH)4 is, in contrast to its polymorph kaolinite, partially irreversible. At ambient conditions after pressure release, a majority phase with composition Al2Si2O5(OH)4·2H2O with an intense (002) diffraction peak near d ~ 8.4 Å has been found. Both in-situ X-ray diffraction and simulati...
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The cover image is based on the Research Article Raman spectroscopic evidence of impurity‐induced structural distortion in SmB6 by Thi Huyen Nguyen et al., https://doi.org/10.1002/jrs.5709.
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Pressure can tailor the properties of a material by changing its atomistic arrangements and/or crystal morphology. We have investigated the changes in the adsorption properties of kaolin group minerals as a function of pressure treatment in the gigapascal range. External pressures have been applied using a large volume press (LVP) to kaolinite (Al2...
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We report the pressure-induced insertion (PII) of gases in a zeolitic imidazolate framework (ZIF) at high pressure. ZIF-8 crystals were compressed in the presence of non-polar CO2 and SF6 as well as polar CHClF2 (aka R22) up to 4.07, 0.81 and 2.06 GPa, respectively in a diamond anvil cell, and their X-ray powder diffraction data were analyzed by Ri...
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Impurity‐induced structural distortion in SmB6 is suggested by Raman spectroscopy study on impurity‐controlled samples. Significant differences in the Raman spectra of single crystals SmB6(6N), synthesized with 99.9999%‐pure boron, and SmB6(3N), synthesized with 99.9%‐pure boron, are detected. While no noticeable differences are detected in the X‐r...
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Many aspects of nanostructured materials at high pressures are still unexplored. We present here, high-pressure structural behavior of two Zn2SnO4 nanomaterials with inverse spinel type, one a particle with size of ∼7 nm [zero dimensional (0-D)] and the other with a chain-like [one dimensional (1-D)] morphology. We performed in situ micro-Raman and...
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In order to understand the role of serpentine minerals in the global carbon cycle, high-pressure X-ray diffraction (XRD) experiments were performed on chrysotile (Mg3Si2O5(OH)4) using carbon dioxide (CO2) as a pressure medium. Synchrotron XRD patterns revealed the formation of magnesite and high-pressure chrysotile after heating at 170 °C for 1 h a...
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Control and design of native defects in semiconductors are extremely important for industrial applications. Here, we investigated the effect of external hydrostatic pressure on the redistribution of native defects and their impact on structural phase transitions and photoconductivity in ZnO. We investigated morphologically distinct rod- (ZnO-R) and...
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In-situ high-pressure synchrotron X-ray powder diffraction studies up to 21 GPa of CVD-grown silicon 2D-nanosheets establish that the structural phase transitions depend on size and shape. For sizes between 9.3(7) nm and 15.2(8) nm we observe an irreversible phase transition sequence from I (cubic) → II (tetragonal) → V (hexagonal) during pressure...
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Pressure-dependent structural and morphological changes of two amphibole minerals, tremolite and actinolite, were investigated up to 7.0 GPa using synchrotron X-ray powder diffraction underthree different pressure transmission media (PTM): water (W), CO2 and silicone oil (SI). The elastic response of tremolite and actinolite are found to be depende...
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An effective combination of host and guest molecules in a framework type of architecture can enhance the structural stability and physical properties of clathrate compounds. We report here that an organic clathrate compound consisting of a fullerene (C60) guest and a hydroquinone (HQ) host framework shows enhanced hydrogen-storage capacity and good...
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It is reported in this paper that pressure can promote strong photoluminescence (PL) in MgO. The PL measurements of MgO powder indicate that it has no obvious luminescence at pressures lower than 13 GPa. PL starts to appear upon further compression and reaches a maximum intensity at about 35 GPa. The center of the emission band shows a red shift at...
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Although ion exclusion is a naturally occurring and commonly observed phenomenon in clathrate hydrates, an understanding for the effect of salt ions on the stability of clathrate hydrates is still unclear. Here we report the first observation of phase transformation of structure I and structure II clathrate hydrates using solid-state 13C, 19F, and...
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In situ high-pressure single-crystal X-ray diffraction studies of mesolite, an aluminosilicate composed of stacks of Na⁺ -containing natrolite and Ca²⁺-containing scolecite layers in the ratio of 1:2, showed two discrete steps of pressure-induced hydration (PIH): first H2O molecules are inserted into the natrolite layers between ∼0.5 and ∼1.5 GPa a...
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Ag-exchanged LSX, a large pore low silica analogue of faujasite, was prepared and post-synthetically modified using pressure and temperature in the presence of various pore-penetrating fluids. Using high-resolution synchrotron X-ray powder and single crystal diffraction we derive structural models of the as-prepared and post-synthetically modified...
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Water is the most abundant volatile component in the Earth. It continuously enters the mantle through subduction zones, where it reduces the melting temperature of rocks to generate magmas. The dehydration process in subduction zones, which determines whether water is released from the slab or transported into the deeper mantle, is an essential com...
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The skeletal tissue of modern bones is mostly composed of hydroxyapatite, which contains calcium and phosphate. During diagenesis, calcium, phosphorus and minerals of the hydroxyl group can be exchanged with other elements to form carbonate-fluorapatite. It is well-established that paleoenvironmental evolution and geological events have played a si...
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Rietveld refinements of natrolite analogs [M16Al16Si24O80·nH2O, M-NAT, M = Li, Na, Ag, K, NH4, Rb, and Cs, 14.0(1) < n <17.6(9)] at temperatures between 75 and 675 K using synchrotron X-ray powder diffraction reveal the impact H2O content and monovalent extra-framework cations (EFC) contained in the channels have on dehydration and thermal expansio...
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Understanding the stability of volatile species and their compounds under various surface and sub-surface conditions is of great importance in gaining insights into the formation and evolution of planetary and satellite bodies. We report the experimental results of the temperature- and pressure-dependent structural transformation of methane hydrate...
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Pressure-dependent structural and chemical changes of the zeolitic imidazolate framework compound ZIF-8 have been investigated using different pressure transmitting media (PTM) up to 4 GPa. The unit cell of ZIF-8 expands and con-tracts under hydrostatic pressure depending on the solvent molecules used as PTM. When pressurized in water up to 2.2(1)...
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Pressure-dependent structural and chemical changes of the metal-organic framework (MOF) compound MIL-47(V) have been investigated up to 3 GPa using different pore-penetrating liquids as pressure transmitting media (PTM). We find that at 0.3(1) GPa the terephthalic acid (TPA) template molecules located in the narrow channels of the as-synthesized MI...
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The high-pressure behaviour and the P-induced structural evolution of a synthetic zeolite Rb7NaGa8Si12O40·3H2O (with edingtonite-type structure) were investigated both by in situ synchrotron powder diffraction (with a diamond anvil cell and the methanol:ethanol:water = 16:3:1 mixture as pressure-transmitting fluid) up to 3.27 GPa and by ab initio f...
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Powder samples of natural lawsonite (Ca-lawsonite, CaAl_2Si_2O_7(OH)_2{\cdot}H_2O) was studied structurally up to 8 GPa at room temperature using monochromatic synchrotron X-ray powder diffraction and a diamond anvil cell (DAC) with a methanol : ethanol : water (16 : 3 : 1 by volume) mixture solution as a penetrating pressure transmitting medium (P...
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We report new insights in dissolution mechanisms of Ni in PtNi bimetallic nanoparticles (NPs) to develop active and durable oxygen reduction catalysts for fuel cells. Leaching out Ni by using acidic aqueous solution has been regarded as one of the most efficient chemical treatments to obtain a Pt-rich surface, which has shown both increased activit...
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The structural, infrared (IR) and Raman spectroscopic properties of alkali-metal exchanged (Na+, K+, Rb+, Cs+) zeolites with the stilbite (STI) framework have been studied by Rietveld analysis of high-resolution synchrotron X-ray powder diffraction data, micro-Raman and synchrotron IR spectroscopy at ambient conditions. Ordered arrangements of the...
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We report on high-pressure and high-temperature chemical transformations of Pb(2+)-exchanged natrolite (Pb-NAT, Pb8Al16Si24O80·16H2O) using a combination of in situ synchrotron X-ray powder diffraction and ex situ HAADF-STEM real space imaging. Three high-pressure polymorphs of natrolites (Pb-NAT-I, II, III) are observed via step-wise pressure-indu...
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Systematic studies of pressure-induced amorphization of natrolites (PIA) containing monovalent extra-framework cations (EFC) Li(+), Na(+), K(+), Rb(+), Cs(+) allow us to assess the role of two different EFC-H2O configurations within the pores of a zeolite: one arrangement has H2O molecules (NATI) and the other the EFC (NATII) in closer proximity to...
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Synchrotron X-ray powder diffraction experiments have been performed on dehydrated Cs- exchanged natrolite to systematically investigate successive transitions under high pressures and temperatures. At pressures above 0.5(1) GPa using H2O as a pressure-transmitting medium and after heating to 100 °C, dehydrated Cs16Al16Si24O80 (deh-Cs-NAT) transfor...
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In-situ high pressure X-ray powder diffraction studies of natrolite (NAT) containing the divalent extra-framework cations (EFC) Sr2+, Ca2+, Pb2+ and Cd2+ reveal that they can be super-hydrated in the presence of water. In the case of Ca-NAT, Sr-NAT and Pb-NAT pressure-induced hydration (PIH) inserts 40 H2O/unit cell into the zeolite compared to 32...
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In situ high-pressure synchrotron X-ray powder diffraction study of three tunnel manganese oxide minerals (hollandite with 2 × 2 MnO6 octahedra tunnels, romanechite with 2 × 3 tunnels, and todorokite with 3 × 3 tunnels) was performed using a diamond anvil cell and nominally penetrating alcohol and water mixture as a pressure-transmitting medium up...
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The optical glow of ceramics that becomes established during the constant state of flash, known as Stage III in flash sintering experiments, is investigated. The specimen temperature in this state is obtained from in situ experiments at the Pohang Light Source II. The measurements of the specimen temperature agree very well with the predictions fro...
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We report here a pressure-driven metathesis reaction where Ag-exchanged natrolite (Ag16Al16Si24O80·16H2O, Ag-NAT) is pressurized in an aqueous CsI solution, resulting in the exchange of Ag(+) by Cs(+) in the natrolite framework forming Cs16Al16Si24O80·16H2O (Cs-NAT-I) and, above 0.5 GPa, its high-pressure polymorph (Cs-NAT-II). During the initial c...
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The inter- and intralayer compression in germanane (GeH) were investigated at room temperature and pressures up to 10 GPa using a diamond-anvil cell (DAC) in combination with X-ray diffraction and micro-Raman spectroscopy. To examine the effect of the pressure-transmitting medium (PTM) on the interlayer compression leading to a possible insertion a...
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Pressure drastically alters the chemical and physical properties of materials and allows structural phase transitions and chemical reactions to occur that defy much of our understanding gained under ambient conditions. Particularly exciting is the high-pressure chemistry of xenon, which is known to react with hydrogen and ice at high pressures and...
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Invited for this month’s cover features the collaboration between four different research groups at Yonsei University, Jilin University, Geophysical Laboratory, and the NanoCentre of the University of South Carolina. The image shows the framework of the small pore zeolite natrolite made up of alternating SiO4 and AlO4 tetrahedral 4-rings and helica...
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The influence of growth temperature on the synthesis of BexZn1−xO alloy films, grown on highly-mismatched Al2O3(0001) substrates, was studied by synchrotron x-ray scattering, high-resolution transmission electron microscopy and photoluminescence measurements. A single-phase BexZn1−xO alloy with a Be concentration of x = 0.25, was obtained at the gr...
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This is a review of the elastic behaviour and pressure (P)-induced structural evolution of zeolites and presents a comparative analysis of the deformation mechanisms of the Si/Al-framework and the rearrangement of the extra-framework species in response to applied pressure. The interaction between P -transmitting fluids and zeolites, which can lead...
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We studied the early-stage growth structures of pentacene organic crystals grown on polymer brushes using real-time x-ray scattering techniques. In situ x-ray reflectivity and atomic force microscopy analyses revealed that at temperatures close to the glass transition temperature of polymer brush, the pentacene overlayer on a polymer brush film sho...
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In-situ Raman and X-ray diffraction experiments have been performed on mineral natrolite (Na-zeolite) to investigate the dehydration behavior under high temperature and high pressure-temperature conditions. XRD data show reversible dehydration up to whereas Raman data show irreversible change when the material is heated up to . The existence of pos...
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High-pressure synchrotron X-ray powder diffraction studies of a series of alkali-metal-exchanged natrolites, A16 Al16 Si24 O80 ⋅n H2 O (A=Li, K, Na, Rb, and Cs and n=14, 16, 22, 24, 32), in the presence of water, reveal structural changes that far exceed what can be achieved by varying temperature and chemical composition. The degree of volume expa...
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Alkali-metal-exchanged natrolites (A16Al16Si24O80⋅n H2O; A=Li, K, Na, Rb, and Cs) in the presence of water undergo unprecedented increases in volume when subjected to pressure, a change that is caused by hydration of the framework (pressure-induced hydration; PIH) and is inversely proportional to cation radius (NFC = non-framework cations). For mor...
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Pressure-induced hydration of Ag16Al16Si24O80 ·16H2O with water and CO2 as pressure-transmitting medium is studied by in situ synchrotron powder XRD.
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By combining X-ray diffraction with oxygen K-edge absorption spectroscopy we track changes occurring during the K+–Na+ cation exchange of Na-natrolite (Na-NAT) as tightly bonded Na+ cations and H2O molecules convert into a disordered K+–H2O substructure and the unit cell expands by ca. 10% after 50% cation exchange. The coordination of the confined...
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Structural phase transitions of N2-loaded and guest-free hydroquinone (HQ) clathrates have been investigated as a function of pressure using synchrotron X-ray diffraction and Raman spectroscopy. The N2-loaded β-form HQ clathrate reveals a structural transition to a new high pressure phase near 4 GPa, and exhibits gradual N2 release from the hydroge...
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CO2 insertion under pressure: In silver-exchanged natrolite, a low and technically achievable onset pressure-induced hydration has been established at 0.4 GPa accompanied by an approximately 5 % expansion in the unit-cell volume. This unique property has been utilized to trap CO2 under pressure in nominally non-penetrating natrolite pores.
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The high-pressure structures of AlPO4-5 (Al12P12O48•9.9H2O) and SSZ-24 (Si24O48) with the same AFI framework topology were studied using synchrotron X-ray powder diffraction and a pore-penetrating (at a mixture of 16:3:1 by volume of methanol:ethanol:water) pressure medium. An analysis of the diffraction profiles of the AlPO4-5 reveals that the a-a...