This article is cited in 14 papers

Ferroelectricity

Phase transitions in lead hafnate PbHfO$_{3}$ under high pressure

M. A. Kniazeva^a, D. A. Andronikova^ab, G. A. Lityagin^a, Yu. A. Bronvald^ab, P. Parisiades^c, A. Majchrowski^d, K. Roleder^e, A. V. Filimonov^a, R. G. Burkovsky<sup>a

a</sup> Peter the Great St. Petersburg Polytechnic University
^b Ioffe Institute, St. Petersburg
^c European Synchrotron Radiation Facility (ESRF), Grenoble, France
^d Institute of Applied Physics, Military University of Technology, Warszawa, Poland
^e Institute of Physics, University of Silesia, Chorzów, Poland

Abstract: he effect of hydrostatic pressure on phase transitions in lead hafnate (PbHfO$_{3}$) has been studied by the methods of X-ray diffraction and X-ray diffuse scattering. The measurements were performed in the temperature range of 182 $<T<$ 316$^\circ$C and the pressure range of 1.6 $<P<$ 2.6 GPa. Four regions characterized by different X-ray diffraction patterns and corresponding to an antiferroelectric phase, phases with a long-wavelength modulation of the lead sublattice, and phases with different distortions of the oxygen sublattice are identified. In the temperature region immediately above the region of phases with a long-wavelength modulation, a temperature-dependent maximum in the distribution of diffuse scattering was detected, which means that such a modulation is formed due to condensation of an incommensurate soft mode.

Keywords: antiferroelectricity, lead hafnate, high pressure, order parameters, diffuse scattering.

Received: 14.03.2019
Revised: 24.04.2019
Accepted: 14.05.2019

DOI: 10.21883/FTT.2019.10.48252.421

 English version: Physics of the Solid State, 2019, 61:10, 1759–1765

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