Analysis of Ca-PZT powder obtained by the Pechini and partial oxalate methods

Cerâmica

R. S. Nasar²  M. Cerqueira²  E. Longo¹  J. A. Varela¹ 

[1] ,UFRN Departamento de Química Natal RN

关键词: echini method;    Ca-PZT;    powder sintering;    método Pechini;    Ca-PZT;    sinterização de pós;   

DOI  :  10.1590/S0366-69132008000100006

来源: SciELO

【 摘 要 】

Ca-Pb(Zr,Ti)O3 (Ca-PZT) powders were prepared by a combined method, Pechini technique for the intermediate ZrTiO4 (ZT) particles and oxalate route for the final powder. The intermediate and final products were characterized by X-ray diffraction and BET for phase identification and granulometric analysis, respectively. The surface area of ZT powder reduced remarkably from 70 to 7.4 m²/g when the calcining temperature increased from 600 to 800 °C. Incremental pore volume and average pore diameters of the powder calcined at 700 °C for 3 h were 0.026 cm³/g and 70 Å, respectively. Ca-PZT powder calcined at 800 ºC for 3 h, with agglomeration factor (AF) 2.8, showed no hysteresis in BET analysis, which indicate small agglomeration without micropores among particles. The powder calcined at 750 ºC for 3 h, however, exhibited small AF and high sinterability.

【 授权许可】

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