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Title: Pressure-induced ferroelectric to paraelectric transition in LiTaO 3 and (Li,Mg)TaO 3

Abstract

X-ray powder diffraction and Raman scattering of LiTaO 3 (LT) and (Li,Mg)TaO 3 (LMT) have been measured under pressure up to 46 GPa. Above 30 GPa, the ferroelectric rhombohedral phase (R3c, Z – 6) of LiTaO 3 transforms to a paraelectric orthorhombic phase (Pnma with Z – 4) with a large hysteresis. Rietveld profile fitting analysis shows that the Li-O bond is compressed and approaches that of Ta-O with pressure. The cation distribution analysis of the orthorhombic perovskite structure shows that Li and Ta are located in the octahedral 8-fold coordination sites. Difference Fourier |F obs(hkl)| - |F cal(hkl)| maps of LiTaO 3 and (Li,Mg)TaO 3 indicate polarization in the c axis direction and a more distinct electron density distribution around the Ta position for (Li,Mg)TaO 3 compared to LiTaO 3. The observed effective charges indicate that for (Li,Mg)TaO 3 without vacancies Ta 5+ becomes less ionized as a function of Mg substitution. Considering both site occupancy and effective charge analysis, Ta 5+ is reduced to Ta 4.13+. Mg 2+ and O 2- change to Mg 1.643+ and O 1.732 -, respectively. The space- and time-averaged structures of the dynamical vibration of atoms can be elucidated from the electron densitymore » analysis by difference Fourier and temperature factors T(hkl) in the structure refinement. The refinement of the temperature factor is consistent with the cation distribution assuming full stoichiometry. The residual electron density induced from the excess electron in (Li,Mg)TaO 3 indicates more electrons around the Ta site, as confirmed by the effective charge analysis. Raman spectra of LiTaO 3 and (Li,Mg)TaO 3 show notable changes over the measured pressure range. Raman peaks centered at 250 cm –1 and 350 cm –1 at ambient pressure merge above 8 GPa, which we associate with the diminishing of difference in distances between Li-O and Ta-O bonds with pressure in both materials. Finally, Raman spectra show significant changes at 28 GPa and 33 GPa for LT and LMT, respectively, due to the structural transition from R3c to Pnma consistent with the x-ray diffraction results.« less

Authors:
 [1];  [2];  [2];  [1];  [3];  [1]
  1. Carnegie Institution of Washington, Washington, DC (United States)
  2. Osaka Univ., Osaka (Japan)
  3. Carnegie Institution of Washington, Washington, DC (United States); Center for High Pressure Science and Technology, Shanghai (China)
Publication Date:
Research Org.:
Carnegie Inst. of Washington, Washington, DC (United States); Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1338347
Alternate Identifier(s):
OSTI ID: 1238078
Grant/Contract Number:  
NA0002006; AC02-06CH11357; FG02-99ER45775; NA-0002006; NA0001974; SC-0001057
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 119; Journal Issue: 7; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Yamanaka, Takamitsu, Nakamoto, Yuki, Takei, Fumihiko, Ahart, Muhtar, Mao, Ho-kwang, and Hemley, Russell J. Pressure-induced ferroelectric to paraelectric transition in LiTaO3 and (Li,Mg)TaO3. United States: N. p., 2016. Web. doi:10.1063/1.4941383.
Yamanaka, Takamitsu, Nakamoto, Yuki, Takei, Fumihiko, Ahart, Muhtar, Mao, Ho-kwang, & Hemley, Russell J. Pressure-induced ferroelectric to paraelectric transition in LiTaO3 and (Li,Mg)TaO3. United States. doi:10.1063/1.4941383.
Yamanaka, Takamitsu, Nakamoto, Yuki, Takei, Fumihiko, Ahart, Muhtar, Mao, Ho-kwang, and Hemley, Russell J. Tue . "Pressure-induced ferroelectric to paraelectric transition in LiTaO3 and (Li,Mg)TaO3". United States. doi:10.1063/1.4941383. https://www.osti.gov/servlets/purl/1338347.
@article{osti_1338347,
title = {Pressure-induced ferroelectric to paraelectric transition in LiTaO3 and (Li,Mg)TaO3},
author = {Yamanaka, Takamitsu and Nakamoto, Yuki and Takei, Fumihiko and Ahart, Muhtar and Mao, Ho-kwang and Hemley, Russell J.},
abstractNote = {X-ray powder diffraction and Raman scattering of LiTaO3 (LT) and (Li,Mg)TaO3 (LMT) have been measured under pressure up to 46 GPa. Above 30 GPa, the ferroelectric rhombohedral phase (R3c, Z – 6) of LiTaO3 transforms to a paraelectric orthorhombic phase (Pnma with Z – 4) with a large hysteresis. Rietveld profile fitting analysis shows that the Li-O bond is compressed and approaches that of Ta-O with pressure. The cation distribution analysis of the orthorhombic perovskite structure shows that Li and Ta are located in the octahedral 8-fold coordination sites. Difference Fourier |Fobs(hkl)| - |Fcal(hkl)| maps of LiTaO3 and (Li,Mg)TaO3 indicate polarization in the c axis direction and a more distinct electron density distribution around the Ta position for (Li,Mg)TaO3 compared to LiTaO3. The observed effective charges indicate that for (Li,Mg)TaO3 without vacancies Ta5+ becomes less ionized as a function of Mg substitution. Considering both site occupancy and effective charge analysis, Ta5+ is reduced to Ta4.13+. Mg2+ and O2- change to Mg1.643+ and O1.732 -, respectively. The space- and time-averaged structures of the dynamical vibration of atoms can be elucidated from the electron density analysis by difference Fourier and temperature factors T(hkl) in the structure refinement. The refinement of the temperature factor is consistent with the cation distribution assuming full stoichiometry. The residual electron density induced from the excess electron in (Li,Mg)TaO3 indicates more electrons around the Ta site, as confirmed by the effective charge analysis. Raman spectra of LiTaO3 and (Li,Mg)TaO3 show notable changes over the measured pressure range. Raman peaks centered at 250 cm–1 and 350 cm–1 at ambient pressure merge above 8 GPa, which we associate with the diminishing of difference in distances between Li-O and Ta-O bonds with pressure in both materials. Finally, Raman spectra show significant changes at 28 GPa and 33 GPa for LT and LMT, respectively, due to the structural transition from R3c to Pnma consistent with the x-ray diffraction results.},
doi = {10.1063/1.4941383},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 7,
volume = 119,
place = {United States},
year = {2016},
month = {2}
}

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