caa a22 4500 388022450 CHVBK 20180307124928.0 cr unu---uuuuu 161130e199808 xx s 000 0 eng 10.1557/JMR.1998.0303 doi S0884291400045398 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0303 Kinetics of formation of the pyrochlore and perovskite phases in sol-gel derived lead zirconate titanate powder [Elektronische Daten] Lead zirconate titanate (PZT) powder is prepared by the sol-gel method. The formation of pyrochlore and perovskite phases is investigated by high temperature x-ray diffraction (XRD) and thermal analysis techniques. The pyrochlore phase first appears in x-ray amorphous form, and then gets converted to crystalline state on annealing in air. We show that vacuum annealing of the pyrolyzed amorphous PZT gel suppresses the formation of the crystalline pyrochlore phase. This, in turn, enhances the kinetics of conversion of pyrochlore to perovskite, such that a pyrochlore-free perovskite phase can be obtained by annealing at about 500 °C. On the other hand, if annealing is carried out in air, a crystalline pyrochlore phase is formed, which requires annealing temperatures higher than 600 °C for transformation to the perovskite phase. These observations are explained tentatively in terms of the oxygen stoichiometry of the two phases. Copyright © Materials Research Society 1998 Tiwari V. S. Crystal Growth Laboratory, Centre for Advanced Technology, Indore-452013, India Kumar Arun Crystal Growth Laboratory, Centre for Advanced Technology, Indore-452013, India Wadhawan V. K. Crystal Growth Laboratory, Centre for Advanced Technology, Indore-452013, India Pandey Dhananjai Department of Physics, Banaras Hindu University, Varanasi-221005, India Journal of Materials Research Cambridge University Press 13/8(1998-08), 2170-2173 0884-2914 13:8<2170 1998 13 JMR https://doi.org/10.1557/JMR.1998.0303 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0303 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tiwari V. S. Crystal Growth Laboratory, Centre for Advanced Technology, Indore-452013, India NATIONALLICENCE 700 1- Kumar Arun Crystal Growth Laboratory, Centre for Advanced Technology, Indore-452013, India NATIONALLICENCE 700 1- Wadhawan V. K. Crystal Growth Laboratory, Centre for Advanced Technology, Indore-452013, India NATIONALLICENCE 700 1- Pandey Dhananjai Department of Physics, Banaras Hindu University, Varanasi-221005, India NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/8(1998-08), 2170-2173 0884-2914 13:8<2170 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge