Sequence of phase transitions in PbHfO{sub 3}

The temperature changes in the PbHfO{sub 3} structure in the temperature range of 20 < t < 400 Degree-Sign C have been studied by X-ray powder diffraction. The sequence of phase changes with an increase in temperature was found to be as follows: orthorhombic phase Pbam (O1), orthorhombic phase...

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Bibliographic Details
Published in:Crystallography reports 2012-03, Vol.57 (2)
Main Authors: Kupriyanov, M. F., Petrovich, E. V., Dutova, E. V., Kabirov, Yu. V.
Format: Article
Language:English
Subjects:
BARIUM COMPOUNDS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CUBIC LATTICES
FERROELECTRIC MATERIALS
HAFNIUM COMPOUNDS
LEAD COMPOUNDS
NIOBATES
ORTHORHOMBIC LATTICES
OXIDES
PHASE TRANSFORMATIONS
POTASSIUM COMPOUNDS
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TETRAGONAL LATTICES
TITANATES
X-RAY DIFFRACTION
ZIRCONATES
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Summary:The temperature changes in the PbHfO{sub 3} structure in the temperature range of 20 < t < 400 Degree-Sign C have been studied by X-ray powder diffraction. The sequence of phase changes with an increase in temperature was found to be as follows: orthorhombic phase Pbam (O1), orthorhombic phase C2mm (O2), tetragonal phase P4mm (T), and cubic phase Pm3m (C). The C2mm and P4mm phases are ferroelectric, which is confirmed by measuring the dependences {epsilon}(t). The similarity of the transition pattern obtained with the known transition sequences for ferroelectric (barium titanate, potassium niobate, and lead titanate) and antiferroelectric (lead zirconate) oxides is analyzed.
ISSN:1063-7745
1562-689X
DOI:10.1134/S1063774512020125