Structural variation and optical properties of ZnO-LiGaO 2 pseudo-binary system

Takahisa Omata; Masao Kita; Kosuke Tachibana; Shinya Otsuka-Yao-Matsuo

doi:10.1016/j.jssc.2012.01.053

Structural variation and optical properties of ZnO-LiGaO ₂ pseudo-binary system

Takahisa Omata, Masao Kita, Kosuke Tachibana, Shinya Otsuka-Yao-Matsuo

Center for Mineral Processing and Metallurgy (CMPM)

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

15 Citations (Scopus)

Abstract

The structural variation in the x(LiGaO ₂) _1/2(1-x)ZnO alloy system was studied by powder XRD, TEM-SAD and Raman spectroscopy. It was elucidated that the phase varied upon increasing the alloying level was the wurtzite-type for 0≤x<0.2, the Zn ₂LiGaO ₄-type for 0.2≤x≤0.5 and the β-LiGaO ₂-type for 0.8≤x≤1, and the 0.5<x<0.8 region was the immiscible region of ZnO with LiGaO ₂. The solubility limit of LiGaO ₂ in ZnO was explained by the c ₀/a ₀ ratio based on the fact that there is no binary wurtzite phase for a c ₀/a ₀ less than 1.6. The optical phonons of wurtzite and its derived phase were simply explained by the lattice shrinkage and reduced mass upon reduction the alloying of ZnO with LiGaO ₂. The bowing parameter of the optical band gap of y(Zn ₂LiGaO ₄) _1/4(1-y)ZnO was determined to be 0.67 eV. The value was very low, and it was related to the small lattice and chemical mismatches between the Zn ₂LiGaO ₄ and ZnO.

Original language	English
Pages (from-to)	92-99
Number of pages	8
Journal	Journal of Solid State Chemistry
Volume	188
DOIs	https://doi.org/10.1016/j.jssc.2012.01.053
Publication status	Published - 2012 Apr

Keywords

Energy band gap
IIIIV semiconductor
Lithium gallium oxide
Phase transformation
Wide band gap semiconductors
Zinc oxide

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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title = "Structural variation and optical properties of ZnO-LiGaO 2 pseudo-binary system",

abstract = "The structural variation in the x(LiGaO 2) 1/2(1-x)ZnO alloy system was studied by powder XRD, TEM-SAD and Raman spectroscopy. It was elucidated that the phase varied upon increasing the alloying level was the wurtzite-type for 0≤x<0.2, the Zn 2LiGaO 4-type for 0.2≤x≤0.5 and the β-LiGaO 2-type for 0.8≤x≤1, and the 0.52. The solubility limit of LiGaO 2 in ZnO was explained by the c 0/a 0 ratio based on the fact that there is no binary wurtzite phase for a c 0/a 0 less than 1.6. The optical phonons of wurtzite and its derived phase were simply explained by the lattice shrinkage and reduced mass upon reduction the alloying of ZnO with LiGaO 2. The bowing parameter of the optical band gap of y(Zn 2LiGaO 4) 1/4(1-y)ZnO was determined to be 0.67 eV. The value was very low, and it was related to the small lattice and chemical mismatches between the Zn 2LiGaO 4 and ZnO.",

keywords = "Energy band gap, IIIIV semiconductor, Lithium gallium oxide, Phase transformation, Wide band gap semiconductors, Zinc oxide",

author = "Takahisa Omata and Masao Kita and Kosuke Tachibana and Shinya Otsuka-Yao-Matsuo",

note = "Funding Information: This work was supported in part by a Grant-in-Aid for Scientific Research of Challenging Exploratory Research (Grant No. 23656402 ). ",

year = "2012",

month = apr,

doi = "10.1016/j.jssc.2012.01.053",

language = "English",

volume = "188",

pages = "92--99",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

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AU - Omata, Takahisa

AU - Kita, Masao

AU - Tachibana, Kosuke

AU - Otsuka-Yao-Matsuo, Shinya

N1 - Funding Information: This work was supported in part by a Grant-in-Aid for Scientific Research of Challenging Exploratory Research (Grant No. 23656402 ).

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N2 - The structural variation in the x(LiGaO 2) 1/2(1-x)ZnO alloy system was studied by powder XRD, TEM-SAD and Raman spectroscopy. It was elucidated that the phase varied upon increasing the alloying level was the wurtzite-type for 0≤x<0.2, the Zn 2LiGaO 4-type for 0.2≤x≤0.5 and the β-LiGaO 2-type for 0.8≤x≤1, and the 0.52. The solubility limit of LiGaO 2 in ZnO was explained by the c 0/a 0 ratio based on the fact that there is no binary wurtzite phase for a c 0/a 0 less than 1.6. The optical phonons of wurtzite and its derived phase were simply explained by the lattice shrinkage and reduced mass upon reduction the alloying of ZnO with LiGaO 2. The bowing parameter of the optical band gap of y(Zn 2LiGaO 4) 1/4(1-y)ZnO was determined to be 0.67 eV. The value was very low, and it was related to the small lattice and chemical mismatches between the Zn 2LiGaO 4 and ZnO.

AB - The structural variation in the x(LiGaO 2) 1/2(1-x)ZnO alloy system was studied by powder XRD, TEM-SAD and Raman spectroscopy. It was elucidated that the phase varied upon increasing the alloying level was the wurtzite-type for 0≤x<0.2, the Zn 2LiGaO 4-type for 0.2≤x≤0.5 and the β-LiGaO 2-type for 0.8≤x≤1, and the 0.52. The solubility limit of LiGaO 2 in ZnO was explained by the c 0/a 0 ratio based on the fact that there is no binary wurtzite phase for a c 0/a 0 less than 1.6. The optical phonons of wurtzite and its derived phase were simply explained by the lattice shrinkage and reduced mass upon reduction the alloying of ZnO with LiGaO 2. The bowing parameter of the optical band gap of y(Zn 2LiGaO 4) 1/4(1-y)ZnO was determined to be 0.67 eV. The value was very low, and it was related to the small lattice and chemical mismatches between the Zn 2LiGaO 4 and ZnO.

KW - Energy band gap

KW - IIIIV semiconductor

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KW - Phase transformation

KW - Wide band gap semiconductors

KW - Zinc oxide

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