Optical crystallographic study of piezoelectric KxNa 1-xNbO3 (x = 0.4, 0.5 and 0.6) single crystals using linear birefringence

Shashaank Gupta; Steven Huband; Dean S. Keeble; David Walker; Pam Thomas; Dwight Viehland; Shashank Priya

doi:10.1039/c3ce40627j

Optical crystallographic study of piezoelectric K_xNa _1-xNbO₃ (x = 0.4, 0.5 and 0.6) single crystals using linear birefringence

Shashaank Gupta, Steven Huband, Dean S. Keeble, David Walker, Pam Thomas, Dwight Viehland, Shashank Priya

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

17 Scopus citations

Abstract

In this study, we report an optical crystallographic study of K _xNa_1-xNbO₃ (x = 0.4, 0.5 and 0.6) single crystals in the temperature range of 30-600°C. At room temperature, these three compositions were found to exhibit monoclinic M_C, monoclinic M_A/M_B and orthorhombic symmetries respectively. All the compositions showed a transformation to tetragonal and to cubic symmetries around 200°C and 400°C respectively. In the tetragonal phase field (200-400°C), coexistence of a lower symmetry phase was also evident. In the paraelectric regime (400-600°C), all crystals exhibited non-zero birefringence, suggestive of deviation from ideal cubic symmetry m3m. Furthermore, crystals of the morphotropic phase boundary composition (x = 0.5) were found to have very small and organized domains, as compared to the other two compositions.

Original language	English (US)
Pages (from-to)	6790-6799
Number of pages	10
Journal	CrystEngComm
Volume	15
Issue number	34
DOIs	https://doi.org/10.1039/c3ce40627j
State	Published - Sep 14 2013

All Science Journal Classification (ASJC) codes

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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title = "Optical crystallographic study of piezoelectric KxNa 1-xNbO3 (x = 0.4, 0.5 and 0.6) single crystals using linear birefringence",

abstract = "In this study, we report an optical crystallographic study of K xNa1-xNbO3 (x = 0.4, 0.5 and 0.6) single crystals in the temperature range of 30-600°C. At room temperature, these three compositions were found to exhibit monoclinic MC, monoclinic MA/MB and orthorhombic symmetries respectively. All the compositions showed a transformation to tetragonal and to cubic symmetries around 200°C and 400°C respectively. In the tetragonal phase field (200-400°C), coexistence of a lower symmetry phase was also evident. In the paraelectric regime (400-600°C), all crystals exhibited non-zero birefringence, suggestive of deviation from ideal cubic symmetry m3m. Furthermore, crystals of the morphotropic phase boundary composition (x = 0.5) were found to have very small and organized domains, as compared to the other two compositions.",

author = "Shashaank Gupta and Steven Huband and Keeble, {Dean S.} and David Walker and Pam Thomas and Dwight Viehland and Shashank Priya",

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T1 - Optical crystallographic study of piezoelectric KxNa 1-xNbO3 (x = 0.4, 0.5 and 0.6) single crystals using linear birefringence

AU - Gupta, Shashaank

AU - Huband, Steven

AU - Keeble, Dean S.

AU - Walker, David

AU - Thomas, Pam

AU - Viehland, Dwight

AU - Priya, Shashank

PY - 2013/9/14

Y1 - 2013/9/14

N2 - In this study, we report an optical crystallographic study of K xNa1-xNbO3 (x = 0.4, 0.5 and 0.6) single crystals in the temperature range of 30-600°C. At room temperature, these three compositions were found to exhibit monoclinic MC, monoclinic MA/MB and orthorhombic symmetries respectively. All the compositions showed a transformation to tetragonal and to cubic symmetries around 200°C and 400°C respectively. In the tetragonal phase field (200-400°C), coexistence of a lower symmetry phase was also evident. In the paraelectric regime (400-600°C), all crystals exhibited non-zero birefringence, suggestive of deviation from ideal cubic symmetry m3m. Furthermore, crystals of the morphotropic phase boundary composition (x = 0.5) were found to have very small and organized domains, as compared to the other two compositions.

AB - In this study, we report an optical crystallographic study of K xNa1-xNbO3 (x = 0.4, 0.5 and 0.6) single crystals in the temperature range of 30-600°C. At room temperature, these three compositions were found to exhibit monoclinic MC, monoclinic MA/MB and orthorhombic symmetries respectively. All the compositions showed a transformation to tetragonal and to cubic symmetries around 200°C and 400°C respectively. In the tetragonal phase field (200-400°C), coexistence of a lower symmetry phase was also evident. In the paraelectric regime (400-600°C), all crystals exhibited non-zero birefringence, suggestive of deviation from ideal cubic symmetry m3m. Furthermore, crystals of the morphotropic phase boundary composition (x = 0.5) were found to have very small and organized domains, as compared to the other two compositions.

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DO - 10.1039/c3ce40627j

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Optical crystallographic study of piezoelectric K_xNa _1-xNbO₃ (x = 0.4, 0.5 and 0.6) single crystals using linear birefringence

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