Pressure-induced transformations of multiferroic relaxor PbFe0.5Nb0.5O3
- Carnegie Inst. of Washington, Washington, DC (United States)
- George Washington Univ., Washington, DC (United States)
- Howard Univ., Washington, DC (United States); Carnegie Inst. of Washington, Washington, DC (United States)
The effects of hydrostatic pressure at ambient temperature on the structural and dielectric properties of PbFe0.5Nb0.5O3 (PFN) were investigated using second harmonic generation (SHG) and powder x-ray diffraction measurements to 31 GPa. The results demonstrate that PFN undergoes a pressure-induced structural transition from the R3$$m$$ ferroelectric to the $$R$$$\bar{3}m$$ paraelectric phase. SHG measurements showed a continuous decrease in the signal with pressure and complete disappearance at 7.1 GPa. Effective nonlinear optical coefficients were determined from the SHG data, and their pressure behavior was used to infer the nature of the transition. The loss of the SHG signal is accompanied by drastic changes in line widths of Bragg reflections, but no discontinuous change in volume was observed. The pressure-volume data were fit to various equations of state, and a bulk modulus $$K_0$$ = 136 (±2) GPa, bulk modulus pressure derivative $$K_0$$' = 4.0 (±0.2), and initial volume $$V_0$$ = 64.5 (±0.1) Å3 were obtained.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree); Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); US Department of the Navy, Office of Naval Research (ONR)
- Grant/Contract Number:
- AC02-06CH11357; NA-0002006; SC0001057
- OSTI ID:
- 1427834
- Alternate ID(s):
- OSTI ID: 1422661
- Journal Information:
- Journal of Applied Physics, Vol. 123, Issue 8; ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
Web of Science
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