查看“︁四硒代钨酸铵”︁的源代码

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| Name = 四硒代钨酸铵
| NameEn = Ammonium tetraselenotungstate
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| CASNo = 22474-80-2
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|Section3={{Chembox Properties
| Formula = (NH<sub>4</sub>)<sub>2</sub>WSe<sub>4</sub>
| MolarMass = 535.771
| Appearance = 绿色晶体
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'''四硒代钨酸铵'''是一种无机化合物，化学式为(NH<sub>4</sub>)<sub>2</sub>WSe<sub>4</sub>。可用于制备硒化钨薄膜。<ref>R.D. Engelken. Growth of tungsten selenide films through pyrolytic conversion and anodic electrooxidation of ammonium selenotungstate ((NH<sub>4</sub>)<sub>2</sub>WSe<sub>4</sub>). Materials Research Bulletin, 1985. 20 (10): 1173-1179. doi: 10.1016/0025-5408(85)90091-1</ref>
==制备==
将过量的[[三氧化钨]]加入至氨水中，反应后过滤得到[[钨酸铵]]溶液，反应体系用氮气充满后，通入[[硒化氢]]至饱和，发生放热反应，溶液变成暗棕色，冷却后析出绿色晶体(NH<sub>4</sub>)<sub>2</sub>WSe<sub>4</sub>。（注：如果反应不完全，析出的是红色晶体(NH<sub>4</sub>)<sub>2</sub>WSe<sub>2</sub>O<sub>2</sub>。）<ref>V Lenher, A G Fruehan. Seleno Compounds of Tungsten. ''J. Am. Chem. Soc.'', 1927. 49 (12): 3076–3080. DOI: 10.1021/ja01411a013</ref>
==化学性质==
和其它铵盐一样，四硒代钨酸铵受热会分解。在减压（11mmHg N<sub>2</sub>）下按下式分解：<ref>T Prasad, A Müller. Thermal decompositions of (NH<sub>4</sub>)<sub>2</sub>WSe<sub>4</sub> and (NH<sub>4</sub>)<sub>3</sub>VS<sub>4</sub> under normal and reduced nitrogen pressures. Journal of Thermal Analysis and Calorimetry, 1976. 10(3): 369-373. DOI: 10.1007/BF01909888</ref>
: <chem>(NH4)2WSe4 -> 2 NH3 ^ + H2Se ^ + WSe3</chem>
分解温度为230℃。产物[[三硒化钨]]在230~305℃分解为[[二硒化钨]]和[[硒]]，305~470℃时[[二硒化钨]]分解为单质。

在常压氮气中按下式分解，分解分为两步：
:<chem>(NH4)2WSe4 -> 2 NH3 ^ + H2Se ^ + WSe3</chem>
:<chem>H2Se <=> H2 ^ + Se</chem>
:<chem> WSe3 <=> Se2 + Se</chem>
==参考文献==
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{{铵盐}}
[[category:铵盐]]
[[category:钨化合物]]
[[category:硒化合物]]
[[Category:取代酸盐]]