TY - JOUR
T1 - Pyrochlore-free Pb(Mg1/3Nb2/3)O3 prepared by a combination of the partial oxalate and the polymerized complex methods
AU - Camargo, Emerson R.
AU - Kakihana, Masato
AU - Longo, Elson
AU - Leite, Edson R.
N1 - Funding Information:
The authors acknowledge CNPq, CAPES, FAPESP, PADCT/FINEP (Brazilian R&D fostering bodies), MONBUSHO-Ministry of Education, Science and Culture of Japan, Nippon Sheet Glass Foundation for Materials Science and Engineering and CBMM-Companhia Brasileira de Metalurgia e Mineração.
PY - 2001/1/16
Y1 - 2001/1/16
N2 - Pyrochlore-free Pb(Mg1/3Nb2/3)O3 (PMN) powders were successfully synthesized by the partial oxalate (PO) method using a high reactive MgNb2O6 (MN) precursor powder synthesized by the polymerized complex (PC) method. Raman spectroscopy, X-ray diffraction and nitrogen gas adsorption/desorption isotherms were used to characterize the MN precursor. No evidence of impurities in the MN precursor was found. Lead oxalate synthesized in situ was precipitated onto the surface of MN nanoparticles. The material was filtered, washed and calcined at different temperatures, from 700 to 1000 °C, in air for 2 h to obtain the PMN phase. Thermal analysis, X-ray diffraction and nitrogen adsorption/desorption hysteresis were used to investigate the PMN perovskite phase evolution and the presence of the pyrochlore phase. PMN formation is a function of the time and temperature conditions of the precipitate calcination, and an optimum condition for the thermal decomposition of the precipitate was determined to avoid the formation of the pyrochlore phase.
AB - Pyrochlore-free Pb(Mg1/3Nb2/3)O3 (PMN) powders were successfully synthesized by the partial oxalate (PO) method using a high reactive MgNb2O6 (MN) precursor powder synthesized by the polymerized complex (PC) method. Raman spectroscopy, X-ray diffraction and nitrogen gas adsorption/desorption isotherms were used to characterize the MN precursor. No evidence of impurities in the MN precursor was found. Lead oxalate synthesized in situ was precipitated onto the surface of MN nanoparticles. The material was filtered, washed and calcined at different temperatures, from 700 to 1000 °C, in air for 2 h to obtain the PMN phase. Thermal analysis, X-ray diffraction and nitrogen adsorption/desorption hysteresis were used to investigate the PMN perovskite phase evolution and the presence of the pyrochlore phase. PMN formation is a function of the time and temperature conditions of the precipitate calcination, and an optimum condition for the thermal decomposition of the precipitate was determined to avoid the formation of the pyrochlore phase.
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U2 - 10.1016/S0925-8388(00)01220-2
DO - 10.1016/S0925-8388(00)01220-2
M3 - Article
AN - SCOPUS:0035124404
VL - 314
SP - 140
EP - 146
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
IS - 1-2
ER -