Microstructure and phase composition of hypoeutectic Te–Bi alloy as evaporation source for photoelectric cathode

Bao-guang Wang; Wen-hui Yang; Hong-ye Gao; Wen-huai Tian

doi:10.1007/s12613-018-1605-8

Volume 25 Issue 5

May 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(5): 584-590

Bao-guang Wang, Wen-hui Yang, Hong-ye Gao, and Wen-huai Tian, Microstructure and phase composition of hypoeutectic Te–Bi alloy as evaporation source for photoelectric cathode, Int. J. Miner. Metall. Mater., 25(2018), No. 5, pp. 584-590. https://doi.org/10.1007/s12613-018-1605-8

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Bao-guang Wang, Wen-hui Yang, Hong-ye Gao, and Wen-huai Tian, Microstructure and phase composition of hypoeutectic Te–Bi alloy as evaporation source for photoelectric cathode, Int. J. Miner. Metall. Mater., 25(2018), No. 5, pp. 584-590. https://doi.org/10.1007/s12613-018-1605-8

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Research Article

Microstructure and phase composition of hypoeutectic Te–Bi alloy as evaporation source for photoelectric cathode

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Corresponding authors:
Hong-ye Gao E-mail: qgaohongye@msn.com

Wen-huai Tian E-mail: wenhuaitian@ustb.edu.cn
Received: 13 December 2017; Revised: 2 February 2018; Accepted: 13 February 2018

Abstract

Abstract

A hypoeutectic 60Te–40Bi alloy in mass percent was designed as a tellurium atom evaporation source instead of pure tellurium for an ultraviolet detection photocathode. The alloy was prepared by slow solidification at about 10^-2 K·s^-1. The microstructure, crystal structure, chemical composition, and crystallographic orientation of each phase in the as-prepared alloy were investigated by optical microscopy, scanning electron microscopy, X-ray diffraction, electron backscatter diffraction, and transmission electron microscopy. The experimental results suggest that the as-prepared 60Te–40Bi alloy consists of primary Bi₂Te₃ and eutectic Bi₂Te₃/Te phases. The primary Bi₂Te₃ phase has the characteristics of faceted growth. The eutectic Bi₂Te₃ phase is encased by the eutectic Te phase in the eutectic structure. The purity of the eutectic Te phase reaches 100wt% owing to the slow solidification. In the eutectic phases, the crystallographic orientation relationship between Bi₂Te₃ and Te is confirmed as [0001]_Bi₂Te₃//[1213]_Te and the direction of Te phase parallel to [1120]_Bi₂Te₃ is deviated by 18° from N(2111)_Te.
- Te-Bi alloy;
- microstructure;
- orientation;
- misfit

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