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ELECTROCHEMICAL FORMATION AND CHARACTERIZATION OF MIXED VALENCE AND ABNORMAL VALENCE OXIDE FILMS

混合价态和异常价态氧化膜的电化学形成及表征

基本信息

批准号：
06452330
负责人：
KONNO Hidetaka
金额：
$ 4.86万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452330/
关键词：
Electrodeposition Compounds of abnormal valence Compounds of mixed valence Oxide film Cr (V) compound Mo (V) -Mo (VI) compounds

项目摘要

1. Formation conditions of abnormal valence Cr compound LaCrO_4 from the precursor films electrodeposited from La (III) -Cr (VI) solutions were established. Thermally stable regions of LaCrO_4 were determined as functions of temperature, heating time and oxygen partial pressure. LaCrO_4 is stable below 500ﾟC independent of oxygen partial pressure and does not decompose in a vacuo at room temperature.2. Electric conductivity of LaCrO_4 film increased exponentially with temperature above 150ﾟC,indicating a similar property to semiconductors. The conductivity was higher than that of perovskite type LaCrO_3 film formed by the same process, but the valency control of A site showed no effect on the conductivity.3. Mixed valence molybdenum oxyhydroxide films were formed by cathodic deposition from solutions of ammonium molybdate and magnesium sulfate (MgSO_4). MgSO_4 was found to be a necessary component in the solution to from uniform and adhesive films.4. The mixed valence molybdenum oxyhydroxide films were amorphous and didn't crystallize by heating at 200ﾟC for 12 hours. Spectrophotometric emissivity of the films at 100ﾟC was about 30-50% in the IR region of 4-10 mum and it increased to more than 90% for longer wave length than 10 mum. The films showed electric conductivity with or without drying. These characteristics suggest that the films are potentially useful material for many purposes such as a far IR radiator, sensors, IR detectors, and so on.5. It was found that gel-like oxyhydroxide films of mixed valence rare-earch elements, such as Ce (III) -Ce (IV), can be formed by cathodic polarization in nitrate solutions of rare-earth elements.

1.建立了La(III)-Cr(VI)溶液电沉积前驱体薄膜中异常价态Cr化合物LaCrO_4的形成条件。 LaCrO_4 的热稳定区域被确定为温度、加热时间和氧分压的函数。 LaCrO_4在500℃以下稳定，与氧分压无关，在室温真空中不分解。2． LaCrO_4薄膜的电导率随着温度高于150℃呈指数增加,表现出与半导体相似的性质。其电导率高于相同工艺形成的钙钛矿型LaCrO_3薄膜，但A位价态控制对电导率没有影响。 3．通过阴极沉积钼酸铵和硫酸镁(MgSO_4)溶液形成混合价羟基氧化钼薄膜。发现MgSO_4是溶液中形成均匀、粘性薄膜的必要成分。 4．混合价羟基氧化钼薄膜为非晶态，在200℃加热12小时不结晶。 100℃时薄膜的分光光度发射率在4-10μm的红外区域约为30-50%，对于超过10μm的较长波长，其增加到90%以上。无论干燥或不干燥，薄膜均表现出导电性。这些特性表明这些薄膜是具有多种用途的潜在有用材料，例如远红外辐射器、传感器、红外探测器等。5。研究发现，在稀土元素的硝酸盐溶液中，通过阴极极化可以形成Ce(III)-Ce(IV)等混价稀土元素的凝胶状羟基氧化物薄膜。