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。从LA（III）-CR（VI）溶液电沉积的前体膜中的异常价CR CR CR CR的形成条件。 LACRO_4的热稳定区域确定为温度，加热时间和氧部分压力的功能。 LACRO_4在500°C以下稳定，独立于氧部分压，并且在室温下不会在真空中分解。2。 LACRO_4膜的电导率随温度高于150℃的指数增长，表明与半导体相似。电导率高于由同一过程形成的钙钛矿型LACRO_3膜的电导率，但位点的价值控制对电导率没有影响3。混合价钼氧化物膜是通过硫酸铵和硫酸镁的溶液中的阴极沉积来形成的（MGSO_4）。发现MGSO_4是从均匀和粘合剂膜的解决方案中的必要组成部分。4。混合的价钼氧化物氧化膜是无定形的，并且在200°C的加热12小时内没有结晶。在4-10 MUM的IR区域，膜在100°C处的分光光度发射率约为30-50％，并且在比10 MM的较长波长中，它增加到90％以上。膜显示出有或没有干燥的电导率。这些特征表明，这些膜对于许多目的而言是有用的材料，例如远红外散热器，传感器，IR检测器等。5。已经发现，混合价稀有型元素（例如CE（III）-CE（IV））的凝胶状氧氧化物膜可以通过阴极极化在稀有地球元素的硝酸盐溶液中形成。