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PLZT Phases Near Lead Zirconate: 1. Determination by X‐Ray Diffraction
Author(s) -
Breval Else,
Wang Chiping,
Dougherty Joseph P.,
Gachigi Kamau wa
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00102.x
Subject(s) - orthorhombic crystal system , tetragonal crystal system , materials science , ferroelectricity , crystallography , zirconate , diffraction , phase (matter) , crystal structure , antiferroelectricity , lead zirconate titanate , anisotropy , trigonal crystal system , mineralogy , dielectric , titanate , chemistry , optics , metallurgy , ceramic , physics , optoelectronics , organic chemistry
The room temperature phase diagram of PLZT, (Pb,La)(Zr,Ti)O 3 , or L / Z / T for L <12 and T <10 was constructed using X‐ray diffraction patterns of sintered and crushed PLZT material. The orthorhombic antiferroelectric phase, a tetragonal phase, the rhombohedral (hexagonal) ferroelectric phases, and the mixed La‐rich zone were identified. Increasing substitution of La for Pb in the structure of orthorhombic PLZT leads to a change toward the cubic structure with less anisotropy in a direction corresponding to the cubic 200 direction. At La above ∼8 to 11 mol%, La 2 Zr 2 O 7 appears in the mixed zone. With increasing substitution of Ti for Zr, there is no change toward a cubic structure as the anisotropy is nearly unchanged. However, at a Ti substitution above ∼6 mol%, a rhombohedral and a tetragonal structure appear.