ZrO/W (100) Surface Formation Process Investigated by Means of XPS and LEED

Hideki SATOH; Shigeyuki TAHARA; Satoru KAWATA; Hideaki NAKANE; Hiroshi ADACHI

doi:10.1380/jsssj.17.393

XPSおよびLEEDによるZrO/W(100)表面形成過程の検討

佐藤英樹, 田原茂之, 河田覚, 中根英章, 安達洋

著者情報

ジャーナルフリー

1996 年 17 巻 7 号 p. 393-400

DOI https://doi.org/10.1380/jsssj.17.393

詳細

発行日: 1996/07/10 受付日: 1996/02/21 J-STAGE公開日: 2009/08/07 受理日: 1996/04/10 早期公開日: - 改訂日: -
訂正情報
訂正日: 2009/08/07 訂正理由: - 訂正箇所: 論文抄録訂正内容: Wrong : The chemical composition and structure of ZrO/W (100) surface were examined by means of X-ray photoelectron spectroscopy (XPS) and low energy electron diffraction (LEED) in order to understand the lowering mechanism of work function on the surface. Deposition of several monolayers of zirconium onto a clean W (100) surface and following heating in oxygen ambience caused a decrease in work function and oxidation of zirconium, which was accompanied by change of the LEED, pattern. After the heating in oxygen, the crystal was flash-heated under a UHV condition at an elevated temperature. This treatment caused a chemical change from ZrO₂ to Zr-O complex. The concentration of Zr-0 complex increased as the flashing temperature was raised, and at the same time, the LEED pattern changed from p (2×1) to c (4×2) pattern. The formation of Zr-O complex and the emergence of the c (4×2) pattern accompanied the lowering of work function to 2.7 eV. Stability of the Zr-O layer at a high temperature of 1800 K was also confirmed by XPS analysis at the temperature.
Right : The chemical composition and structure of ZrO/W (100) surface were examined by means of X-ray photoelectron spectroscopy (XPS) and low energy electron diffraction (LEED) in order to understand the lowering mechanism of work function on the surface. Deposition of several monolayers of zirconium onto a clean W (100) surface and following heating in oxygen ambience caused a decrease in work function and oxidation of zirconium, which was accompanied by change of the LEED, pattern. After the heating in oxygen, the crystal was flash-heated under a UHV condition at an elevated temperature. This treatment caused a chemical change from ZrO₂ to Zr-O complex. The concentration of Zr-0 complex increased as the flashing temperature was raised, and at the same time, the LEED pattern changed from p (2×1) to c (4×2) pattern. The formation of Zr-O complex and the emergence of the c (4×2) pattern accompanied the lowering of work function to 2.7 eV. Stability of the Zr-O layer at a high temperature of 1800 K was also confirmed by XPS analysis at the temperature.

抄録

The chemical composition and structure of ZrO/W (100) surface were examined by means of X-ray photoelectron spectroscopy (XPS) and low energy electron diffraction (LEED) in order to understand the lowering mechanism of work function on the surface. Deposition of several monolayers of zirconium onto a clean W (100) surface and following heating in oxygen ambience caused a decrease in work function and oxidation of zirconium, which was accompanied by change of the LEED, pattern. After the heating in oxygen, the crystal was flash-heated under a UHV condition at an elevated temperature. This treatment caused a chemical change from ZrO₂ to Zr-O complex. The concentration of Zr-0 complex increased as the flashing temperature was raised, and at the same time, the LEED pattern changed from p (2×1) to c (4×2) pattern. The formation of Zr-O complex and the emergence of the c (4×2) pattern accompanied the lowering of work function to 2.7 eV. Stability of the Zr-O layer at a high temperature of 1800 K was also confirmed by XPS analysis at the temperature.

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