Phase transitions and thermotropic phase boundaries in MnO2-doped (K0.5Na0.5)NbO3-0.05LiNbO3 single crystals: Raman scattering evidence at elevated temperatures

L. P. Xu; K. Jiang; J. Z. Zhang; G. S. Xu; Z. G. Hu; J. H. Chu

doi:10.1063/1.4916226

Phase transitions and thermotropic phase boundaries in MnO₂-doped (K_0.5Na_0.5)NbO₃-0.05LiNbO₃ single crystals: Raman scattering evidence at elevated temperatures

L. P. Xu
, K. Jiang
, J. Z. Zhang
, G. S. Xu
, Z. G. Hu^*
, J. H. Chu

^*Corresponding author for this work

School of Physics and Electronic Science

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

Raman scattering of (K_0.5Na_0.5)NbO₃-0.05LiNbO₃-yMnO₂ (y = 0% and 1.0%) single crystals have been reported in the temperature range from 300 to 800 K. The spectra exhibit a competition between a soft mode and a relaxation mode upon heating across the diverse transitions. The progressive change in the conflicting displacive mechanism (soft mode) and order-disorder (relaxation mode) can explain the origin of the successive orthorhombic-tetragonal-cubic phase transitions. Moreover, the polymorphic phase transition between orthorhombic and tetragonal structures can be confirmed through the observation of thermotropic phase boundaries for MnO₂-doped (K_0.5Na_0.5)NbO₃-0.05LiNbO₃ single crystals.

Original language	English
Article number	122901
Journal	Applied Physics Letters
Volume	106
Issue number	12
DOIs	https://doi.org/10.1063/1.4916226
State	Published - 23 Mar 2015

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title = "Phase transitions and thermotropic phase boundaries in MnO2-doped (K0.5Na0.5)NbO3-0.05LiNbO3 single crystals: Raman scattering evidence at elevated temperatures",

abstract = "Raman scattering of (K0.5Na0.5)NbO3-0.05LiNbO3-yMnO2 (y = 0\% and 1.0\%) single crystals have been reported in the temperature range from 300 to 800 K. The spectra exhibit a competition between a soft mode and a relaxation mode upon heating across the diverse transitions. The progressive change in the conflicting displacive mechanism (soft mode) and order-disorder (relaxation mode) can explain the origin of the successive orthorhombic-tetragonal-cubic phase transitions. Moreover, the polymorphic phase transition between orthorhombic and tetragonal structures can be confirmed through the observation of thermotropic phase boundaries for MnO2-doped (K0.5Na0.5)NbO3-0.05LiNbO3 single crystals.",

author = "Xu, \{L. P.\} and K. Jiang and Zhang, \{J. Z.\} and Xu, \{G. S.\} and Hu, \{Z. G.\} and Chu, \{J. H.\}",

note = "Publisher Copyright: {\textcopyright} 2015 AIP Publishing LLC.",

year = "2015",

month = mar,

day = "23",

doi = "10.1063/1.4916226",

language = "英语",

volume = "106",

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TY - JOUR

T1 - Phase transitions and thermotropic phase boundaries in MnO2-doped (K0.5Na0.5)NbO3-0.05LiNbO3 single crystals

T2 - Raman scattering evidence at elevated temperatures

AU - Xu, L. P.

AU - Jiang, K.

AU - Zhang, J. Z.

AU - Xu, G. S.

AU - Hu, Z. G.

AU - Chu, J. H.

PY - 2015/3/23

Y1 - 2015/3/23

N2 - Raman scattering of (K0.5Na0.5)NbO3-0.05LiNbO3-yMnO2 (y = 0% and 1.0%) single crystals have been reported in the temperature range from 300 to 800 K. The spectra exhibit a competition between a soft mode and a relaxation mode upon heating across the diverse transitions. The progressive change in the conflicting displacive mechanism (soft mode) and order-disorder (relaxation mode) can explain the origin of the successive orthorhombic-tetragonal-cubic phase transitions. Moreover, the polymorphic phase transition between orthorhombic and tetragonal structures can be confirmed through the observation of thermotropic phase boundaries for MnO2-doped (K0.5Na0.5)NbO3-0.05LiNbO3 single crystals.

AB - Raman scattering of (K0.5Na0.5)NbO3-0.05LiNbO3-yMnO2 (y = 0% and 1.0%) single crystals have been reported in the temperature range from 300 to 800 K. The spectra exhibit a competition between a soft mode and a relaxation mode upon heating across the diverse transitions. The progressive change in the conflicting displacive mechanism (soft mode) and order-disorder (relaxation mode) can explain the origin of the successive orthorhombic-tetragonal-cubic phase transitions. Moreover, the polymorphic phase transition between orthorhombic and tetragonal structures can be confirmed through the observation of thermotropic phase boundaries for MnO2-doped (K0.5Na0.5)NbO3-0.05LiNbO3 single crystals.

UR - https://www.scopus.com/pages/publications/84925823323

U2 - 10.1063/1.4916226

DO - 10.1063/1.4916226

M3 - 文章

AN - SCOPUS:84925823323

SN - 0003-6951

VL - 106

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 12

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ER -

Phase transitions and thermotropic phase boundaries in MnO₂-doped (K_0.5Na_0.5)NbO₃-0.05LiNbO₃ single crystals: Raman scattering evidence at elevated temperatures

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