Electron paramagnetic resonance study of an Al-associated oxygen hole center in kTiOPO4:Al crystals

Jiang Tsu Yu; Chung Hsien Lee; Kuo Tung Liu; Chen Ling Liu; Yutung Huang; D. A. Payne; Kwang Hwa Lii

doi:10.1016/0022-3697(94)00170-7

Electron paramagnetic resonance study of an Al-associated oxygen hole center in kTiOPO₄:Al crystals

Jiang Tsu Yu^*, Chung Hsien Lee, Kuo Tung Liu, Chen Ling Liu, Yutung Huang, D. A. Payne, Kwang Hwa Lii

^*Corresponding author for this work

Department of Physics

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

11 Citations (Scopus)

Abstract

Electron paramagnetic resonance (EPR) has been used to study an oxygen hole centre (O^-) produced in Al-doped KTiOPO₄ crystals γ-irradiated at 300 K. The EPR spectrum exhibited by this point defect can be observed at temperatures between 300 and 100 K. A six-line hyperfine splitting which is ascribed to one ²⁷Al nucleus and a doublet splitting which is ascribed to one ³¹P nucleus have been observed at 150 K. At 150 K, the principal g values are 2.0027, 2.0157 and 2.0464, the principal values of the ²⁷Al hyperfine splitting are 6.3, 7.4 and 7.5 G and the principal values of the ³¹P hyperfine splitting are 0.6, 2.5 and 2.6 G. The hole is trapped at one of the titanyl oxygens and locally associated with an Al³⁺ impurity located at or near a Ti⁴⁺ site. The Al impurity stabilizes the oxygen hole center, which would not be stable at room temperature in undoped crystals.

Original language	English
Pages (from-to)	233-240
Number of pages	8
Journal	Journal of Physics and Chemistry of Solids
Volume	56
Issue number	2
DOIs	https://doi.org/10.1016/0022-3697(94)00170-7
Publication status	Published - 1995 Feb

Keywords

A. optical materials
D. defects
D. electron paramagnetic resonance (EPR)

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

Access to Document

10.1016/0022-3697(94)00170-7

Cite this

@article{185a0acadcc24eb7bed154c05f2d2475,

title = "Electron paramagnetic resonance study of an Al-associated oxygen hole center in kTiOPO4:Al crystals",

abstract = "Electron paramagnetic resonance (EPR) has been used to study an oxygen hole centre (O-) produced in Al-doped KTiOPO4 crystals γ-irradiated at 300 K. The EPR spectrum exhibited by this point defect can be observed at temperatures between 300 and 100 K. A six-line hyperfine splitting which is ascribed to one 27Al nucleus and a doublet splitting which is ascribed to one 31P nucleus have been observed at 150 K. At 150 K, the principal g values are 2.0027, 2.0157 and 2.0464, the principal values of the 27Al hyperfine splitting are 6.3, 7.4 and 7.5 G and the principal values of the 31P hyperfine splitting are 0.6, 2.5 and 2.6 G. The hole is trapped at one of the titanyl oxygens and locally associated with an Al3+ impurity located at or near a Ti4+ site. The Al impurity stabilizes the oxygen hole center, which would not be stable at room temperature in undoped crystals.",

keywords = "A. optical materials, D. defects, D. electron paramagnetic resonance (EPR)",

author = "Yu, {Jiang Tsu} and Lee, {Chung Hsien} and Liu, {Kuo Tung} and Liu, {Chen Ling} and Yutung Huang and Payne, {D. A.} and Lii, {Kwang Hwa}",

year = "1995",

month = feb,

doi = "10.1016/0022-3697(94)00170-7",

language = "English",

volume = "56",

pages = "233--240",

journal = "Journal of Physics and Chemistry of Solids",

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TY - JOUR

T1 - Electron paramagnetic resonance study of an Al-associated oxygen hole center in kTiOPO4:Al crystals

AU - Yu, Jiang Tsu

AU - Lee, Chung Hsien

AU - Liu, Kuo Tung

AU - Liu, Chen Ling

AU - Huang, Yutung

AU - Payne, D. A.

AU - Lii, Kwang Hwa

PY - 1995/2

Y1 - 1995/2

N2 - Electron paramagnetic resonance (EPR) has been used to study an oxygen hole centre (O-) produced in Al-doped KTiOPO4 crystals γ-irradiated at 300 K. The EPR spectrum exhibited by this point defect can be observed at temperatures between 300 and 100 K. A six-line hyperfine splitting which is ascribed to one 27Al nucleus and a doublet splitting which is ascribed to one 31P nucleus have been observed at 150 K. At 150 K, the principal g values are 2.0027, 2.0157 and 2.0464, the principal values of the 27Al hyperfine splitting are 6.3, 7.4 and 7.5 G and the principal values of the 31P hyperfine splitting are 0.6, 2.5 and 2.6 G. The hole is trapped at one of the titanyl oxygens and locally associated with an Al3+ impurity located at or near a Ti4+ site. The Al impurity stabilizes the oxygen hole center, which would not be stable at room temperature in undoped crystals.

AB - Electron paramagnetic resonance (EPR) has been used to study an oxygen hole centre (O-) produced in Al-doped KTiOPO4 crystals γ-irradiated at 300 K. The EPR spectrum exhibited by this point defect can be observed at temperatures between 300 and 100 K. A six-line hyperfine splitting which is ascribed to one 27Al nucleus and a doublet splitting which is ascribed to one 31P nucleus have been observed at 150 K. At 150 K, the principal g values are 2.0027, 2.0157 and 2.0464, the principal values of the 27Al hyperfine splitting are 6.3, 7.4 and 7.5 G and the principal values of the 31P hyperfine splitting are 0.6, 2.5 and 2.6 G. The hole is trapped at one of the titanyl oxygens and locally associated with an Al3+ impurity located at or near a Ti4+ site. The Al impurity stabilizes the oxygen hole center, which would not be stable at room temperature in undoped crystals.

KW - A. optical materials

KW - D. defects

KW - D. electron paramagnetic resonance (EPR)

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