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

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

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JOURNAL FREE ACCESS

1996 Volume 17 Issue 7 Pages 393-400

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

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Published: July 10, 1996 Received: February 21, 1996 Available on J-STAGE: August 07, 2009 Accepted: April 10, 1996 Advance online publication: - Revised: -
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Date of correction: August 07, 2009 Reason for correction: - Correction: ABSTRACT Details: 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.

Abstract

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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