Work

Elastic anomalies associated with the antiferroelectric phase transitions of PbHfO3 single crystals

Year: 2014

Type: article

Abstract: The temperature dependence of the elastic properties of antiferroelectric PbHfO 3 was investigated by using Brillouin scattering. The two structural phase transitions of antiferroelectricantiferroelectric-paraelectric phases were clearly identified from the discontinuous changes in the acoustic mode frequencies and the hypersonic damping. The substantial softening of the mode frequency, along with the remarkable increase in the acoustic damping observed in the paraelectric phase, indicated the formation of precursor noncentrosymmetric (polar) clusters and their coupling to the acoustic waves. This was corroborated by the observation of quasi-elastic central peaks, the intensity of which grew upon cooling toward the Curie point. The obtained relaxation time exhibited a slowing-down behavior, suggesting that the dynamics of the precursor clusters became more sluggish on approaching the phase transition temperature.

Source: Journal of the Korean Physical Society

DOI: 10.3938/jkps.64.1169

Authors: Jae-Hyeon Ko, Krystian Roleder, Andrzej Majchrowski, Annette Bussmann-Holder

Institutions: Hallym University, University of Silesia in Katowice, Military University of Technology in Warsaw, Max Planck Institute for Solid State Research

Language: English

Topic: Ferroelectric and Piezoelectric Materials

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: National Research Foundation of Korea, Ministry of Education, Science and Technology

Awards: G1055830439, G2051599103