Thin films of cobalt oxides obtained by a reaction during vacuum deposition

被引：4
|
作者：
Rashkova, V
Kitova, S
Litynska, L
Vitanov, T
机构：
[1] BAS, Cent Lab Photoproc, Acad J Malinowski, Sofia 1113, Bulgaria
[2] PAS, Inst Met & Mat Sci, PL-30059 Krakow, Poland
[3] BAS, Cent Lab Electrochem Power Sources, Sofia 1113, Bulgaria
来源：
VACUUM | 2004年 / 76卷 / 2-3期
关键词：
cobalt oxides; thin films; vacuum evaporation; microscopy of thin films; thermal effects;
D O I：
10.1016/j.vacuum.2004.07.072
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The structure and the composition of thin films obtained by vacuum co-evaporation of Co and TeO2 are studied by scanning and transmission electron microscopy, X-ray photoelectron spectroscopy and energy dispersive spectroscopy. Carbon coated mica is used as a substrate. It is shown that during vacuum deposition a chemical reaction between both substances take place resulting in the formation of COO and Te phases, amorphous or nanocrystalline depending on the atomic ratio R-Co/Te. The reaction proceeds until the complete oxidation of Co to Co2+ in the films with R-Co/Te < 2 or until the complete reduction of TeO2 to elemental Te in the films with R-Co/Te > 2. Upon subsequent treatment at 400degreesC the reaction proceeds until complete consumption of excess TeO2 in the films with R-Co/Te < 2 or excess of Co in the films with R-Co/Te > 2 and the formation of nanocrystals of Co3O4, Co6Te5O16 and CoTe2. A partial evaporation of Te takes also place. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码：147 / 150
页数：4
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