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Title: High P-T Raman study of transitions in relaxor multiferroic Pb(Fe 0.5Nb 0.5)O 3

The vibrational and structural properties of Pb(Fe 0.5Nb 0.5)O 3 have been investigated using Raman spectroscopy up to 40 GPa at 300 K and from 300 to 415 K at selected pressures. The measurements reveal three phase transitions at 5.5, 8.7 and 24 GPa at room temperature. The temperature dependences of the spectra indicated transitions at 1.5 GPa, at 335 and 365 K. The results support the appearance of an intermediate tetragonal P4mm phase between ferroelectric R3m and paraelectric Pm-3m phases. Furthermore, a P-T phase diagram is proposed that allows further insight into the magnetoelectric coupling present in this material.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [4] ;  [2]
  1. Washington College, Chestertown, MD (United States); Carnegie Institution of Washington, Washington, D.C. (United States)
  2. Carnegie Institution of Washington, Washington, D.C. (United States)
  3. Univ. of Edinburgh, Edinburgh (United Kingdom)
  4. Chinese Academy of Sciences (CAS), Shanghai (China)
Publication Date:
Grant/Contract Number:
NA0002006
Type:
Accepted Manuscript
Journal Name:
Journal of Raman Spectroscopy
Additional Journal Information:
Journal Volume: 47; Journal Issue: 2; Journal ID: ISSN 0377-0486
Publisher:
Wiley
Research Org:
Carnegie Institution of Washington, Washington, D.C. (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; relaxor; multiferroric; high-pressure; two-phonon peak; phase transitions
OSTI Identifier:
1335156