The extent of BiInO 3 substitution in the perovskite system x BiInO 3 –(1 - x )PbTiO 3 and the corresponding raise in the Curie temperature were investigated using thermal analysis, dielectric measurements, x-ray diffraction, and electron microscopy. Maximum tetragonal perovskite distortion ( c / a = 1.082) was obtained for x = 0.20, with a corresponding Curie temperature of 582 °C. Phase-pure tetragonal perovskite was obtained for x ⩽ 0.25. Compound formation after calcining mixed oxide powders resulted in agglomerated cube-shaped tetragonal perovskite particles, which could be fired to 94.7% of theoretical density (TD). Sol-gel fabrication resulted in nano-sized tetragonal or pseudo-cubic perovskite particles, which after two-step firing, resulted in a tetragonal perovskite microstructure at as high as ( x = 0.20) 98.1% of TD.
[1]
Howard F. McMurdie,et al.
Phase diagrams for ceramists
,
1964
.
[2]
Thomas R. Shrout,et al.
New High Temperature Morphotropic Phase Boundary Piezoelectrics Based on Bi(Me)O3–PbTiO3 Ceramics
,
2001
.
[3]
B. Cullity,et al.
Elements of X-ray diffraction
,
1957
.
[4]
N. Setter,et al.
Piezoelectric materials in devices
,
2002
.
[5]
R. Newnham,et al.
Materials for high temperature acoustic and vibration sensors: A review
,
1994
.