PZT Powders Synthesized by Hydrothermal Method

doi:10.3724/SP.J.1077.2012.00507

Abstract

Abstract:

Lead zirconate titanate (PZT) powders with single-phase, cubic morphology and average size of 1 μm were synthesized using hydrothermal methods. Effects of KOH concentration, hydrothermal treatment time and Pb excess were investigated. The results show that KOH concentration has an important influence on the solid solubility of Pb ion in A-site of PZT perovskite structure. The concentration of Pb²⁺ vacancies increased with the increase of OH^-concentration. However, this kind of deficiency could be compensated by adding more Pb ions in the raw materials, and more Pb ions were needed to add with higher alkaline concentration in the starting solution. But excessive compensation of Pb ions would result in the appearance of the second phase.

Key words: PZT powder, hydrothermal syntheses, Pb excess

CLC Number:

TF125

ZHU Kong-Jun, ZHU Ren-Qiang, DONG Na-Na, GU Hong-Hui, QIU Jin-Hao, JI Hong-Li. PZT Powders Synthesized by Hydrothermal Method[J]. Journal of Inorganic Materials, 2012, 27(5): 507-512.

Figures/Tables 11

Fig. 1 XRD patterns of PZT powders prepared with different KOH concentrations Condition: 200℃, 4 h

Table 1 Crystal cell parameters of PZT powders prepared with different KOH concentrations

Series	Lattice constant /nm		c/a ratio
Series	a	c	c/a ratio
0.5 mol/L	0.399	0.412	1.033
1 mol/L	0.403	0.410	1.017

Table 2 ICP results of PZT powders prepared with different KOH concentrations

Series	KOH /(mol·L^-1)	X	Y
A	0.5	0.542	0.90
B	1	0.544	0.75
C	2	0.493	0.68

Fig. 2 SEM images of PZT powders prepared with different KOH concentrations Condition: 200℃, 4 h

Fig. 3 XRD patterns of PZT powders prepared with 1 mol/L KOH Condition: 200℃,1 mol/L KOH

Fig. 4 SEM images of PZT powders prepared for different hydrothermal treatment time Condition: 200℃, 1 mol/L KOH

Fig. 5 XRD patterns of PZT powders prepared for with different Pb excesses Condition: 200℃, 4 h, 0.5 mol/L KOH

Table 3 ICP results of PZT powders obtained at 200℃ for 4 h with different experimental parameters

Series	KOH /(mol·L^-1)	Pb excess /mol%	X	Y
A	0.5	0	0.542	0.90
B	0.5	20	0.513	1.05
C	1	0	0.544	0.75
D	1	40	0.514	1.03
E	1	60	0.514	1.03
F	2	0	0.493	0.68
G	2	60	0.512	0.97

Fig. 6 SEM images of PZT powders prepared with different Pb excesses Condition: 200℃, 4 h, 0.5 mol/L KOH

Fig. 7 XRD patterns of PZT powders prepared with different Pb excesses Condition: 200℃, 2 mol/L KOH, 4 h

Fig. 8 SEM photographs of PZT powders prepared with different Pb excess Condition: 200℃, 2 mol/L KOH, 4 h

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