Lihong Xue

Tsinghua University, Beijing, Beijing Shi, China

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Publications (4)5.41 Total impact

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    ABSTRACT: The effect of variations of the Zr:Sn ratio on the microstructure and electric properties of lead lanthanum zirconate stannate titanate (PLZST) antiferroelectric ceramics were investigated. The precursor powders were synthesized by the modified coprecipitation method and all the samples were pure perovskite phase in the XRD patterns. The ceramics sintered at 1100 °C exhibited the highest relative density. With the increasing of Sn4+ content, the grain size of the ceramics was decreased in the SEM and the maximum dielectric constant and the corresponding temperature were decreased. The P–E hysteresis loops indicated that it is helpful to steady the antiferroelectric phase by increasing Sn4+ content.
    Journal of Physics and Chemistry of Solids 10/2007; 68(10):2008-2013. · 1.59 Impact Factor
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    ABSTRACT: Lead lanthanum zirconium titanium stannate (PLZST) has been synthesized by a modified coprecipitation in a polyvinyl alcohol (PVA) aqueous solution. X-ray diffraction (XRD) study shows single perovskite phase formation at 650°C for 2h. The average particle size of calcined powder was about 70nm. The green pellets have been sintered at 1000°C, 1050°C, 1100°C and 1150°C for 2h, respectively. Effect of sintering temperature on microstructure and dielectric properties has been investigated. Dense ceramics with average grain size about 2μm were obtained at the relatively low temperature of 1050°C for 2h and dielectric constant of 1633 at 1kHz has been observed. Also, a comparison of particle size and sintering process is made between the samples prepared by the modified coprecipitation and the conventional coprecipitation.
    Materials Science and Engineering B 08/2006; 132(3):253-257. · 2.12 Impact Factor
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    ABSTRACT: A lactate precursor route for synthesis of lanthanum-doped lead zirconate titanate stannate (PLZST) ceramic powders was developed, based on an aqueous solution of lactic acid and Pb2+, La3+, Zr4+, Ti4+, Sn4+ ions. The metal ions were brought in solution through complex formation with lactic acid. An amorphous precursor was prepared by dehydration of the soluble metal–ion–lactate complex solution. Heat treatment of the precursor at 650 °C for 2 h resulted in single phase perovskite PLZST powders. The effects of the ratio of lactic acid to mixed metal ions on the characteristics of PLZST powders were studied. The results showed that the powders prepared with the higher ratio (6:1) precursor consisted of finer particles with diameter of 45 nm and sintered readily to dense ceramics at the relatively low temperature of 1100 °C for 2 h. A typical antiferroelectric double polarization hysteresis loop was measured.
    Journal of the European Ceramic Society. 01/2006;
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    ABSTRACT: Lead lanthanum zirconate titanate stannate (PLZST) single crystals have been successfully grown by a flux method using KF as flux. Well-developed single crystals with sizes of 2.0mm×2.0mm×1.5mm were obtained for the first time. The crystal morphology was studied and related to a layer growth mechanism controlled by two-dimensional growth. Crystal structure measured by X-ray diffraction technique was single perovskite. The chemical composition of as-grown crystal was analyzed by an energy dispersive X-ray spectrometer and inductively coupled plasma atomic emission spectrometry. The maximum dielectric constant was determined to be 2400. The Curie temperature was found to be about 170°C, similar to the polycrystalline data.
    Journal of Crystal Growth 10/2005; 283(3):378-383. · 1.69 Impact Factor