XPS Studies of 80 K-Phase Bi-Sr-Ca-Cu-O Single Crystals

Abstract

The XPS (X-ray photoelectron spectroscopy) measurements of the 80 K-phase Bi-Sr-Ca-Cu-O single crystals were carried out on surfaces obtained by cleaving in vacuum, by cleaving in air and heating in vacuum, and by Ar+-sputter etching of the air-cleaved-and-heated surface. The chemical bond natures of all the constituent elements from the air-cleaved-and-heated surface are approximately equal to those from the vacuum-cleaved surface. Sr and Ca from the sputtered surface are more oxidized than those from the vacuum-cleaved surface.

Moisture-induced degradation and its mechanism of (Sr,Ca)AlSiN3:Eu2+, a red-color-converter for solid state lighting

“…It was reported that the XPS peak positions of Sr 3d shifted to the higher-energy side upon oxidation. 25,26,28 This is due to the greater electronegativity of oxygen. So in our case, Sr 3d 3/2 can be further deconvoluted into Sr-O (3d 3/2 ) and Sr-N (3d 3/2 ) at B136.12 and B135.13 eV, respectively, and Sr 3d 5/2 into Sr-O (3d 5/2 ) and Sr-N (3d 5/2 ) at B134.32 and B133.31 eV, respectively.…”