Lihong Xue

Huazhong University of Science and Technology, Wu-han-shih, Hubei, China

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Publications (39)70.63 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Nanocrystalline TiO2 catalysts with different anatase/rutile ratios have been successfully prepared using a single-step solution combustion synthesis (SCS). The synthesized powders were characterized using XRD, Raman, XPS, FT-IR, SEM, TEM, BET and UV-Vis DRS. The effects of urea-to-nitrate molar ratio on the phase structure, morphology and photocatalytic activity of the TiO2 powders were investigated. Results show that the urea contents play an important role in controlling the crystal structure of the samples. Specifically, well-dispersed anatase/rutile TiO2 nanocomposites (anatase 66.2%, rutile 33.8%) with excellent photocatalytic activity can be obtained when the molar ratio of urea-to-nitrate is 0.50. The synergistic effect between the anatase and rutile is responsible for the enhanced performance of this material. Moreover, a thermodynamic calculation was performed to interpret the phase transformation mechanism during the combustion process.
    Ceramics International 06/2015; DOI:10.1016/j.ceramint.2015.05.161 · 2.09 Impact Factor
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    ABSTRACT: Well-crystallized α-Al2O3/TiC composite coating was synthesized on the surface of steel substrate by a facile laser-assisted combustion synthesis technique without subsequent calcination. The effect of laser cladding speed on formation and microstructure of the coatings was studied. At 6 mm/s, α-Al2O3/TiC coating with good quality was obtained without pores and cracks and was well bonded with the steel substrate. By adjusting the precoating thickness, the coating thickness was easily controlled. As a simple, environmentally friendly and energy-saving technique, laser-assisted combustion synthesis is expected to find applications in ceramic coating fabrication as tritium permeation barrier or wear- and corrosion-resistance coatings.
    International Journal of Applied Ceramic Technology 04/2015; DOI:10.1111/ijac.12398 · 1.22 Impact Factor
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    ABSTRACT: Lithium titanate (Li2TiO3) ceramic pebbles were successfully fabricated by using hydrothermal and improved dry-rolling method. In the present work, ultra-fine Li2TiO3 powder of high reactivity was prepared via hydrothermal reaction, using anatase titania and lithium hydroxide as raw materials. The as-synthesized Li2TiO3 powder exhibits an average crystalline size as small as 100 nm. Improved dry-rolling method was employed to fabricate Li2TiO3 pebbles. The green pebbles can be well-sintered (81% T.D.) at a temperature as low as 850 °C for 3 hours. The pebbles have good sphericity (1.08) and narrow diameter distribution (1.0-1.2 mm) with a crush load of 35 N. Scanning electron microscope (SEM) observations of pebbles showed that the ceramic grain size was below 1 μm and atomic emission spectrometer fitted with inductively coupled plasma (ICP-AES) results confirmed that atomic ratio of Li to Ti in the fabricated pebbles was 1.97.
    Journal of Nuclear Materials 01/2015; DOI:10.1016/j.jnucmat.2015.01.044 · 2.02 Impact Factor
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    ABSTRACT: Nano-crystalline Li2TiO3 powder was prepared by a microwave-induced solution combustion synthesis (MSCS) route using urea as fuel. It is observed that combustion reaction, which did not occur by conventional heating, happened when microwave heating was induced. The as-synthesized Li2TiO3 powder exhibits a narrow size distribution. In MSCS, the total metal ion concentration (Cm) in the starting solution plays an important role. By changing Cm values in starting solution, SCS process including ignition time, combustion period and reaction rate can be controlled. The as-prepared powder could be sintered up to 92.6% of the theoretical density at 1223 K.
    Journal of Nuclear Materials 12/2014; 455(s 1–3):101–105. DOI:10.1016/j.jnucmat.2014.05.019 · 2.02 Impact Factor
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    ABSTRACT: A facile hydrothermal approach has been developed to synthesize the nanostructured dual phase Li4Ti5O12/TiO2 composite. The fabrication process simply involves the hydrothermal treatment of tetrabutyl titanate with LiOH in glycerol-water solution and a subsequent calcination procedure. The calcination treatment at 500 °C leads to the phase evolution from Li1.81H0.19Ti2O5•nH2O to Li4Ti5O12/TiO2 composite with a particle size of about 30 nm. It is found that glycerol as chelating agent plays an important role in the formation of TiO2. The Li4Ti5O12 and anatase TiO2 nano-composite exhibits rich hierarchical pores and a specific surface area of 91.88 m2 g−1, delivers ultrahigh rate performance of over 150 mA h g−1 at 20 C, as well as superior capacity retention of 151.4 mAh g−1 after 100 cycles at 1 C. It is therefore concluded that Li4Ti5O12/TiO2 nano-composite is a promising candidate for applications in high rate lithium ion batteries.
  • Heping Li, Lihong Xue, Youwei Yan
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    ABSTRACT: Co/BaTiO3 nanofibers with diameter of 100 nm have been successfully prepared using the novel electrospinning technique followed by subsequent reductive annealing treatment. The synthesized Co/BaTiO3 nanofibers were demonstrated to be polycrystalline with a double-phase heterostructure, containing both Co metal phase and BaTiO3 tetragonal phase by TEM, XPS and Raman spectroscopy analysis. Magnetization measurements revealed that the electrospun nanofibers had unique temperature-dependent magnetic properties. The simplicity and effectiveness of electrospinning make it a competitive approach to get one-dimensional heterogeneous nanostructure. The achievements shown here may also help to find new multiferroic materials.
    Journal of Alloys and Compounds 10/2014; 611:38–42. DOI:10.1016/j.jallcom.2014.05.080 · 2.73 Impact Factor
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    ABSTRACT: Eu-doped (Bi0.5Na0.5)(0.94)Ba0.06TiO3 (BNBT6-xEu, x=0.00-2.00 at%) lead-free piezoelectric ceramics have been synthesized by the solution combustion method. The effect of Eu doping concentration on the phase structure, microstructure and electrical properties of BNBT6 ceramics has been investigated. The XRD analysis confirms that the europium additive incorporates into the BNBT6 lattice and results in a phase transition from the coexistence of rhombohedral and tetragonal phases to a more symmetric pseudocubic phase. The SEM images indicate that the europium additive has little effect on the ceramic microstructure and the average grain size is about 2.0 mu m. The electrical properties of BNBT6 ceramics can be improved by appropriate Eu doping. The 0.25 at% Eu doped BNBT6 ceramic presents excellent electrical properties: piezoelectric constant d(33)=149 pC/N, remnant polarization P-r=40.27 mu C/cm(2), coercive field E-c=2.95 kV/mm, dielectric constant epsilon(r)=1658 and dissipation factor tan delta=0.0557 (10 kHz).
    Ceramics International 06/2014; 40(5):7007-7013. DOI:10.1016/j.ceramint.2013.12.028 · 2.09 Impact Factor
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    ABSTRACT: A single phase Li2TiO3 powder has been fabricated through a facile solution combustion process, using citric acid as the fuel and corresponding nitrates as oxidants. The effect of fuel-to-oxidizer ratio (0.5–1.5) on the combustion process, the phase and microstructure of the products was investigated. By using different combinations of citric acid fuel and metal nitrates, the combustion mode could be controlled. When the fuel-to-oxidizer ratio is 0.75, an eruption combustion mode is realized. Thermodynamic analysis of the combustion reaction shows that as the fuel-to-oxidizer ratio increases, the adiabatic flame temperature during combustion also increases, but the measured maximum temperature decreases. The crystallite size of Li2TiO3 powders was calculated to be 18–36 nm at different combustion modes. The as-prepared Li2TiO3 powders exhibit excellent sinterability and can be sintered to 90.7% of the theoretical density at 800 °C. The grain size of the Li2TiO3 ceramics is around 800 nm.
    Journal of the European Ceramic Society 03/2014; 34(3):801–807. DOI:10.1016/j.jeurceramsoc.2013.10.004 · 2.31 Impact Factor
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    ABSTRACT: Nanostructured Na0.5Bi0.5TiO3 particles have been synthesized by a hydrothermal synthesis method using a layered titanate H1.07Ti1.73O4 center dot nH(2)O as a Ti precursor. The obtained Na0.5Bi0.5TiO3 particles showed different morphologies including plate-like, wire-like, and cubic-like structures in different hydrothermal conditions. The effect of the NaOH concentration on the growth and morphology evolution of hydrothermally derived Na0.5Bi0.5TiO3 powders were investigated. It was found that alkaline concentration had a great effect on the phase and morphology of the resultant powders. The dissolution-recrystallization and in situ topotactic transformation mechanisms were suggested in different alkaline concentrations according to the evolution process.
    Journal of Materials Science 10/2013; 48(20):1-7. DOI:10.1007/s10853-013-7491-6 · 2.31 Impact Factor
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    ABSTRACT: Pure Bi0.5Na0.5TiO3 powders have been successfully synthesized by a single-step solution combustion technology using urea as fuel and metal (Bi and Na) nitrates as reactants. The phase structure and morphology of the as-prepared product were examined by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Effects of reaction parameters including fuel to oxidizers ratio and ignition temperature on the phase formation and morphology evolution were investigated. XRD shows that a single perovskite BNT phase is formed at the ignition temperature of 600 degrees C with fuel to oxidizers ratio of 2.0. Well-dispersed powders with the average particle size of 200 nm are obtained after milling for 24 h. BNT ceramics can be well densified at 1140 degrees C for 2 h with average grain size about 2 mu m and show evidence of relaxor ferroelectric behaviors with diffuse phase transition and frequency dispersion.
    Ceramics International 09/2013; 39(7-7):8147-8152. DOI:10.1016/j.ceramint.2013.03.088 · 2.09 Impact Factor
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    ABSTRACT: A lepidocrocite-like potassium lithium titanate K0.80Ti1.733Li0.267O4 (KLTO) with layered structure was synthesized by an auto-igniting solution combustion method using glycine and metal (Ti, K and Li) nitrate as reactants. The crystalline structure and morphology of the as-prepared product were examined using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and transmission electron microscopy. Effects of reaction parameters such as ignition temperature and oxidizers to fuel ratio on the phase formation and morphology evolution are investigated in this paper. A pure phase of KTLO was obtained at a low temperature (650 degrees C) within several minutes. Excessive glycine added into the aqueous precursor solution facilitated the synthesis of a pure and well-crystallized product. As-prepared particles exhibited plate-like shape with a length of 5-20 mu m and a thickness of about 2 mu m. No residual organic compound existed in the product. After the as-prepared product was post solution combustion heat-treated (1100 degrees C for 2 h), the particles became uniform in size with smooth surface and well-defined crystalline structure. The product exhibited excellent ion-exchange, intercalation, and exfoliation properties. The exfoliated titania nanosheets are characterized by high two-dimensional anisotropy with a thickness of about 20 nm and a lateral size ranging from sub-micrometers to several tens of micrometers.
    Journal of Materials Science 02/2013; 48(4-4):1533-1542. DOI:10.1007/s10853-012-6908-y · 2.31 Impact Factor
  • Mifang Yan, Lihong Xue, Youwei Yan
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    ABSTRACT: A series of Ca1.95P2O7: 0.05Eu(3+), B3+, M+ (M=Li, Na, K) phosphors were prepared by combustion synthesis method using boric acid as flux agent and M+ as charge compensator. The crystal structure and luminescent properties were investigated. The emission spectra show that the most intensive emission peak is located at 612nm, corresponding to the D-5(0)-F-7(2) transition of Eu3+. The phosphors can be efficiently excited by 394nm and 464nm light, which are matched well with the emission wavelength of near UV and blue light-emitting chips, respectively. The results show that boric acid is effective in improving the luminescence intensity, and the optimum molar ratio of boric acid to the pyrophosphate is 0.09. The relative emission intensities of Eu3+ (D-5(0)-F-7(2)) in Ca2P2O7:Eu3+ phosphors with M+ (M=Li, Na, K) introduced as charge compensator are significantly enhanced, and the phosphor added with Na+ show the strongest emission.
    2nd International Conference on Chemical, Material and Metallurgical; 01/2013
  • Source
    Mifang YAN, Lihong XUE, Youwei YAN
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    ABSTRACT: Red phosphors M1.95P2O7:0.05Eu3+ (M = Ba, Sr, Ca) were synthesized with urea as a fuel by a combustion-assisted method. The phase composition and luminescence properties were investigated by X-ray diffraction and fluorescence spectroscopy, respectively. The result shows that the samples prepared appear pure hexagonal Ba2P2O7, orthorhombic Sr2P2O7 and tetragonal Ca2P2O7, respectively. The excitation and emission peaks of the M1.95P2O7:0.05Eu3+ (M = Ba, Sr, Ca) phosphors were located at the same points. The M1.95P2O7:0.05Eu3+ (M = Ba, Ca) emitted mainly a red light, and the intensity of the emission peaks located at 612 nm due to 5D0→7F2 electric-dipole transition of Eu3+ was greater than that located at 588 and 593 nm due to 5D0→7F2 electric-dipole transition. It indicated that Eu3+ lied in non-centrosysmetrical sites. On the contrary, the Sr1.95P2O7:0.05Eu3+ phosphor emitted mainly an orange-red light, and Eu3+ lied in centrosymmetry sites, The CIE chromaticity diagram coordinate of M1.95P2O7:0.05Eu3+ (M = Ba, Sr, Ca) phosphors were calculated as (0.35, 0.21), (0.24, 0.15) and (0.35, 0.21), respectively. All the three phosphors could be excited by a near UV light at 394 nm and a blue light at 464 nm, emitting a red or an orange-red light.
    Kuei Suan Jen Hsueh Pao/ Journal of the Chinese Ceramic Society 01/2013; 41(3). DOI:10.7521/j.issn.0454–5648.2013.03.11
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    ABSTRACT: Bulk dense composites of Al–Fe alloys containing 2.5–10 at% Fe were fabricated by mechanical alloying (MA) and spark plasma sintering (SPS). Supersaturated Al(Fe) solid solutions were obtained by MA for 80 h. The sintered samples are composed of nano and ultrafine needle-like Al13Fe4 phase and angular-shaped Al13Fe4 phase with a size range of 1–2 μm uniformly distributed in the Al matrix. Needle-like Al13Fe4 phase originates from the precipitation of supersaturated Al(Fe) solid solutions, and angular-shaped Al13Fe4 phase originates from the reaction of undissolved Fe particles and the Al melt. The hardness of the alloys varied from 1.44 to 1.97 GPa and Al–10%Fe exhibited highest specific yield strength of 391.1 kN m/kg. The yield strength varied from 657 to 1130 MPa, depending on the Fe content. Excellent plastic strain (>14.5%) were achieved in the alloys containing 2.5–5%Fe, but the Al–10%Fe exhibited elastic behavior only, failing without any macroscopic yielding or plastic strain. The lack of plastic performance of Al–10%Fe is attributed to large amount of undissolved Fe particles reacted with the Al melt to form angular-shaped Al13Fe4, leading to the absence of soft α-Al phase.
    Materials Science and Engineering A 12/2012; 558:684–691. DOI:10.1016/j.msea.2012.08.076 · 2.41 Impact Factor
  • Shanshan Yao, Lihong Xue, Youwei Yan
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    ABSTRACT: A blue emitting phosphor of the triclinic BaCa2Si3O9:Eu2+ was prepared by the combustion-assisted synthesis method and an efficient blue emission ranging from the ultraviolet to visible was observed. The luminescence and crystallinity were investigated using luminescence spectrometry and X-ray diffractometry (XRD), respectively. The emission spectrum shows a single intensive band centered at 445 nm, which corresponds to the 4f65d1→4f7 transition of Eu2+. The excitation spectrum is a broad extending from 260 to 450 nm, which matches the emission of ultraviolet light-emitting diodes (UV-LEDs). The critical quenching concentration of Eu2+ in BaCa2Si3O9:Eu2+ phosphor is about 0.05 mol. The corresponding concentration quenching mechanism is verified to be a dipole–dipole interaction. The CIE of the optimized sample Ba0.95Ca2Si3O9:Eu0.052+ was (x, y)=(0.164, 0.111). The result indicates that BaCa2Si3O9:Eu2+ can be potentially useful as a UV radiation-converting phosphor for white light-emitting diodes (LEDs).
    Optics & Laser Technology 10/2011; 43(7):1282-1285. DOI:10.1016/j.optlastec.2011.03.024 · 1.65 Impact Factor
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    ABSTRACT: A1.95ZnSi2O7:Eu0.053+ (A=Ca, Sr, Ba) red phosphors were prepared by combustion-assisted synthesis method and their efficient red emission under near ultraviolet (UV) were observed. The luminescence and crystallinity were investigated using luminescence spectrometry and X-ray diffractometer, respectively. The emission spectrum shows that the most intense peak is located at 614 nm, which corresponds to the 5D0→7F2 transition of Eu3+. These phosphors have two main excitation peaks located at 394 and 465 nm, which match the emission of UV and blue light-emitting diodes, respectively. Thus, these phosphors could be used as red components for white light-emitting diodes.
    Journal of the American Ceramic Society 01/2011; 94(5):1477 - 1482. DOI:10.1111/j.1551-2916.2010.04261.x · 2.43 Impact Factor
  • Shanshan YAO, Lihong XUE, Youwei YAN
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    ABSTRACT: The hardystonite phosphors of Eu2+ activated M2ZnSi2O7 (M=Sr, Ba) were synthesized by combustion-assisted method. They were systematically characterized by photoluminescence excitation and emission spectra. The emission spectra of these two phosphors showed that the main emission peaks are at 475 and 503 nm due to 4f65d1→4f7 transition of Eu2+. Both phosphors could be efficiently excited in the wavelength range of 250-425 nm where the near ultraviolet light-emitting diode was well matched. The (x, y) color coordinates were determined with the emission values (x, y)=(0.41, 0.21) and (0.16, 0.45) for the M2ZnSi2O7: Eu2+ (M=Sr, Ba) phosphors.
    Journal of Rare Earths 12/2010; 28:265–268. DOI:10.1016/S1002-0721(10)60325-0 · 1.34 Impact Factor
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    ABSTRACT: Ba2−xMg1−yZnySi2O7:Eux2+ blue–green phosphor particles were prepared by combustion-assisted synthesis method as the fluorescent material for ultraviolet light-emitting diodes (UV-LEDs), performing as a light source. The luminescent properties were investigated by changing the postannealing temperature, the concentration of the activator, and the ratio of Zn to Mg. The crystallinity and luminescence were investigated by using an X-ray diffractometer and a luminescence spectrometer. The pure monoclinic Ba2MgSi2O7 and Ba2ZnSi2O7 phases were formed when the posttreatment temperature was 1000°C. It was found that the introduction of Zn2+ into Ba2MgSi2O7:Eu2+ effectively increased its emission. The emission spectra presented an emission position red shift of up to 5 nm from Ba2Mg Si2O7:Eu2+ to Ba2ZnSi2O7:Eu2+, which is correlated with the effect of Zn2+ substituting for Mg2+ sites. The excitation spectrum of Ba2ZnSi2O7:Eu2+ was a broad-band extending from 260 to 465 nm, which matches the emission of UV-LEDs.
    Journal of the American Ceramic Society 11/2010; 93(11):3793 - 3797. DOI:10.1111/j.1551-2916.2010.03929.x · 2.43 Impact Factor
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    Lihong Xue, Youwei Yan
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    ABSTRACT: Highly oriented barium titanate (BaTiO3) thin films on Pt substrate were fabricated by combination of elec-trophoretic deposition with hydrothermal treatment. The structure and morphology of thin films were characterized by X-ray diffraction and field-emission scanning electron microscopy. It is found that the titania precursor film, Ba(OH)2 concentration and hydrothermal temperature play crucial roles in the film morphology and orientation. The BaTiO3 thin films with highly (110) preferred orientation can be formed on polycrystalline Pt substrate by appropriate adjustment of the reaction conditions. The orientation parameter f of highly oriented BaTiO3 films was up to 1.00. The films exhibited a smooth and crack-free surface and remained in the layered structure. In situ topotactic transformation and dissolution-crystallization mechanisms were proposed to explain the morphology and orientation of BaTiO3 films during hydrothermal treatment.
    Journal of Materials Science and Technology -Shenyang- 11/2010; 26(11):996-1000. DOI:10.1016/S1005-0302(10)60163-6 · 1.61 Impact Factor
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    ABSTRACT: A blue–green emitting phosphor of the monoclinic Ba2MgSi2O7:Eu2+ was prepared by the combustion-assisted synthesis method and an efficient bluish-green emission under from ultraviolet to visible light was observed. The luminescence, crystallinity and particle sizes were investigated by using luminescence spectrometry, X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The emission spectrum shows a single intensive band centered at 498 nm, which corresponds to the 4f65d1 → 4f7 transition of Eu2+. The excitation spectrum is a broad extending from 260 to 465 nm, which matches the emission of ultraviolet light-emitting diodes (UV-LEDs). The critical quenching concentration of Eu2+ in Ba2MgSi2O7:Eu2+ phosphor is about 0.05 mol. The corresponding concentration quenching mechanism is verified to be a dipole–dipole interaction. The result indicates that Ba2MgSi2O7:Eu2+ can be potentially useful as a UV radiation-converting phosphor for white light-emitting diodes (LEDs).
    Physica Status Solidi (A) Applications and Materials 09/2010; 207(9):2164 - 2169. DOI:10.1002/pssa.200925524 · 1.53 Impact Factor

Publication Stats

163 Citations
70.63 Total Impact Points

Institutions

  • 2009–2015
    • Huazhong University of Science and Technology
      • State Key Laboratory of Material Processing and Die & Mould Technology
      Wu-han-shih, Hubei, China
  • 2008
    • Kochi University
      • Research Laboratory of Hydrothermal Chemistry
      Kôti, Kōchi, Japan
  • 2005–2007
    • Tsinghua University
      • Department of Chemistry
      Beijing, Beijing Shi, China