TY - JOUR
T1 - Crystallization of lanthanum-modified lead zirconate titanate (Plzt) using coprecipitated gels
AU - Lee, Yao Jung
AU - Yen, Fu Su
AU - Wu, Jong Ping
AU - Hsiang, Hsing I.
PY - 1995/8
Y1 - 1995/8
N2 - Powders of lanthanum-modified lead zirconate titanate (Pb0.91La0.09)(Zr0.65Ti0.35)0.98O3 (PLZT 9/65/35) were obtained by calcination of various precursors via chemical coprecipitation methods. The precursors included the coprecipitated gel with the stoichiometric PLZT composition, PbO (powdered chemical reagent)+LZT coprecipitated gel, and mixture of Pb, La, Zr, and Ti individually precipitated gels. Crystallization behaviors of these precursors were examined over the temperature range of 400°-900°C using X-ray diffraction (XRD), transmission electron microscopy (TEM) and differential thermal analysis/thermal gravimetric analysis (DTA/TGA) techniques. For coprecipitated PLZT gels, perovskite PLZT accompanied by pyrochlore crystallized at 500°C; further heating promoted the development of PLZT, and single-phase PLZT was achieved at 700°C. For PbO + LZT coprecipitated gels, PLZT began to form at 550°C. The formation reaction was complete at 800°C and only a limited amount of pyrochlore intermediate was detected by XRD. For the mixture of Pb, La, Zr, and Ti gels, PLZT crystallized at 900°C, litharge, massicot, PbTiO3(PT), and PbZrO3(PZ) were formed as the intermediate phase instead of pyrochlore.
AB - Powders of lanthanum-modified lead zirconate titanate (Pb0.91La0.09)(Zr0.65Ti0.35)0.98O3 (PLZT 9/65/35) were obtained by calcination of various precursors via chemical coprecipitation methods. The precursors included the coprecipitated gel with the stoichiometric PLZT composition, PbO (powdered chemical reagent)+LZT coprecipitated gel, and mixture of Pb, La, Zr, and Ti individually precipitated gels. Crystallization behaviors of these precursors were examined over the temperature range of 400°-900°C using X-ray diffraction (XRD), transmission electron microscopy (TEM) and differential thermal analysis/thermal gravimetric analysis (DTA/TGA) techniques. For coprecipitated PLZT gels, perovskite PLZT accompanied by pyrochlore crystallized at 500°C; further heating promoted the development of PLZT, and single-phase PLZT was achieved at 700°C. For PbO + LZT coprecipitated gels, PLZT began to form at 550°C. The formation reaction was complete at 800°C and only a limited amount of pyrochlore intermediate was detected by XRD. For the mixture of Pb, La, Zr, and Ti gels, PLZT crystallized at 900°C, litharge, massicot, PbTiO3(PT), and PbZrO3(PZ) were formed as the intermediate phase instead of pyrochlore.
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U2 - 10.1143/JJAP.34.4137
DO - 10.1143/JJAP.34.4137
M3 - Article
AN - SCOPUS:0029352516
VL - 34
SP - 4137
EP - 4142
JO - Japanese Journal of Applied Physics
JF - Japanese Journal of Applied Physics
SN - 0021-4922
IS - 8 R
ER -