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Title: Pressure-induced ferroelectric to antiferroelectric phase transition in Pb{sub 0.99}(Zr{sub 0.95}Ti{sub 0.05}){sub 0.08}Nb{sub 0.2}O{sub 3}

Abstract

Zr-rich, Nb-doped lead zirconate titanate ceramic and powder samples with composition near Pb{sub 0.99}(Zr{sub 0.95}Ti{sub 0.05}){sub 0.98}Nb{sub 0.02}O{sub 3} [PZT95/5(2Nb)] have been studied in the range of hydrostatic pressure 0-6.2 kbar and temperature 12-295 K by time-of-flight neutron powder diffraction and dielectric measurements. The combination of the two techniques has led to further insights into the properties and pressure-induced ferroelectric rhombohedral R3c (F{sub R(LT)}) to antiferroelectric orthorhombic Pbam (A{sub O}) phase transition in this material, and the diffraction results have provided a detailed view of the ionic displacements induced by changes in pressure and temperature as well as the displacements accompanying the transition. At 295 K the diffraction results revealed a sharp transition at 2.1 kbar; at 200 K this transition occurs at 1.1 kbar. The transformation is incomplete: after the initial sharp drop in the F{sub R(LT)} content at the transition, 20 wt % of the sample remains in the low-pressure F{sub R(LT)} phase. Above the transition, the fraction of F{sub R(LT)}, which exists as a minority phase in the high-pressure A{sub O} phase, continues to decrease, but even at our highest pressure of 6.2 kbar, {approx}8 wt % of the sample remains in the F{sub R(LT)} phase. Themore » volume contraction at the F{sub R(LT)}-to-A{sub O} transition unexpectedly results in the retained minority F{sub R(LT)} being anisotropically ''clamped,'' with its a axis slightly expanded and c axis contracted at the transition. On pressure release to 1 bar at 295 K, only 26% of the F{sub R(LT)} phase is recovered, and this remains in the clamped state because of the surrounding majority A{sub O} phase. Heating the sample above 350 K at 1 bar followed by cooling to room temperature results in full recovery of the F{sub R(LT)} phase. The spontaneous polarization (P{sub S}) of the F{sub R(LT)} phase and its pressure and temperature dependences were determined from the ionic displacements. At 295 K, P{sub S}=38 {mu}C/cm{sup 2}--a value greater than the 31-32 {mu}C/cm{sup 2} commonly observed on ceramic PZT95/5(2Nb) samples. The difference is undoubtedly related to residual porosity in ceramic samples as well as the inability of the poling electric field to align all the polar domains. P{sub S} increases monotonically with decreasing temperature, reaching a value of {approx}44 {mu}C/cm{sup 2} at 12 K.« less

Authors:
; ; ; ; ; ;  [1];  [2]
  1. Argonne National Laboratory, Argonne, Illinois 60636 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
20787893
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 73; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevB.73.064105; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROELECTRIC MATERIALS; CERAMICS; DOPED MATERIALS; ELECTRIC FIELDS; FERROELECTRIC MATERIALS; HEAT TREATMENTS; NEUTRON DIFFRACTION; NIOBIUM; ORTHORHOMBIC LATTICES; PHASE TRANSFORMATIONS; POLARIZATION; POROSITY; POWDERS; PRESSURE DEPENDENCE; PRESSURE RELEASE; PZT; TEMPERATURE DEPENDENCE; TIME-OF-FLIGHT METHOD; TRIGONAL LATTICES

Citation Formats

Avdeev, Maxim, Jorgensen, James D., Short, Simine, Samara, George A., Venturini, Eugene L., Yang, Pin, Morosin, Bruno, and Sandia National Laboratories, Albuquerque, New Mexico 87185. Pressure-induced ferroelectric to antiferroelectric phase transition in Pb{sub 0.99}(Zr{sub 0.95}Ti{sub 0.05}){sub 0.08}Nb{sub 0.2}O{sub 3}. United States: N. p., 2006. Web. doi:10.1103/PHYSREVB.73.0.
Avdeev, Maxim, Jorgensen, James D., Short, Simine, Samara, George A., Venturini, Eugene L., Yang, Pin, Morosin, Bruno, & Sandia National Laboratories, Albuquerque, New Mexico 87185. Pressure-induced ferroelectric to antiferroelectric phase transition in Pb{sub 0.99}(Zr{sub 0.95}Ti{sub 0.05}){sub 0.08}Nb{sub 0.2}O{sub 3}. United States. doi:10.1103/PHYSREVB.73.0.
Avdeev, Maxim, Jorgensen, James D., Short, Simine, Samara, George A., Venturini, Eugene L., Yang, Pin, Morosin, Bruno, and Sandia National Laboratories, Albuquerque, New Mexico 87185. Wed . "Pressure-induced ferroelectric to antiferroelectric phase transition in Pb{sub 0.99}(Zr{sub 0.95}Ti{sub 0.05}){sub 0.08}Nb{sub 0.2}O{sub 3}". United States. doi:10.1103/PHYSREVB.73.0.
@article{osti_20787893,
title = {Pressure-induced ferroelectric to antiferroelectric phase transition in Pb{sub 0.99}(Zr{sub 0.95}Ti{sub 0.05}){sub 0.08}Nb{sub 0.2}O{sub 3}},
author = {Avdeev, Maxim and Jorgensen, James D. and Short, Simine and Samara, George A. and Venturini, Eugene L. and Yang, Pin and Morosin, Bruno and Sandia National Laboratories, Albuquerque, New Mexico 87185},
abstractNote = {Zr-rich, Nb-doped lead zirconate titanate ceramic and powder samples with composition near Pb{sub 0.99}(Zr{sub 0.95}Ti{sub 0.05}){sub 0.98}Nb{sub 0.02}O{sub 3} [PZT95/5(2Nb)] have been studied in the range of hydrostatic pressure 0-6.2 kbar and temperature 12-295 K by time-of-flight neutron powder diffraction and dielectric measurements. The combination of the two techniques has led to further insights into the properties and pressure-induced ferroelectric rhombohedral R3c (F{sub R(LT)}) to antiferroelectric orthorhombic Pbam (A{sub O}) phase transition in this material, and the diffraction results have provided a detailed view of the ionic displacements induced by changes in pressure and temperature as well as the displacements accompanying the transition. At 295 K the diffraction results revealed a sharp transition at 2.1 kbar; at 200 K this transition occurs at 1.1 kbar. The transformation is incomplete: after the initial sharp drop in the F{sub R(LT)} content at the transition, 20 wt % of the sample remains in the low-pressure F{sub R(LT)} phase. Above the transition, the fraction of F{sub R(LT)}, which exists as a minority phase in the high-pressure A{sub O} phase, continues to decrease, but even at our highest pressure of 6.2 kbar, {approx}8 wt % of the sample remains in the F{sub R(LT)} phase. The volume contraction at the F{sub R(LT)}-to-A{sub O} transition unexpectedly results in the retained minority F{sub R(LT)} being anisotropically ''clamped,'' with its a axis slightly expanded and c axis contracted at the transition. On pressure release to 1 bar at 295 K, only 26% of the F{sub R(LT)} phase is recovered, and this remains in the clamped state because of the surrounding majority A{sub O} phase. Heating the sample above 350 K at 1 bar followed by cooling to room temperature results in full recovery of the F{sub R(LT)} phase. The spontaneous polarization (P{sub S}) of the F{sub R(LT)} phase and its pressure and temperature dependences were determined from the ionic displacements. At 295 K, P{sub S}=38 {mu}C/cm{sup 2}--a value greater than the 31-32 {mu}C/cm{sup 2} commonly observed on ceramic PZT95/5(2Nb) samples. The difference is undoubtedly related to residual porosity in ceramic samples as well as the inability of the poling electric field to align all the polar domains. P{sub S} increases monotonically with decreasing temperature, reaching a value of {approx}44 {mu}C/cm{sup 2} at 12 K.},
doi = {10.1103/PHYSREVB.73.0},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 6,
volume = 73,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2006},
month = {Wed Feb 01 00:00:00 EST 2006}
}