Barium Sulfide - Leucabarium

BaS (169.39). It is obtained by passing an equimolar mixture of hydrogen sulfide and hydrogen through barium carbonate heated to about 1000 °C. Colorless cubic crystal. Density 4.25 g cm ^-3 (15 °C). Melting point 2200 °C. It is oxidized in air to produce barium thiosulfate. It also absorbs water and carbon dioxide to produce hydrogen sulfide. When water is added, it is hydrolyzed to produce barium hydrogen sulfide and barium hydroxide. It dissolves in acid to produce hydrogen sulfide. It is insoluble in ethanol. It is used to manufacture the white pigment lithopone. It is also used in fluorescent paints because it fluoresces when it contains traces of other heavy metals. Other polysulfides include barium trisulfide BaS ₃ [CAS 12231-01-5] (yellow crystals, decomposes at 400 °C, easily soluble in water) and barium tetrasulfide (light red, orthorhombic columnar crystals, decomposes at 200 °C, easily soluble in water). A mixture of these (called barium sulfide flower) is used as an insecticide and a depilatory for leather. Toxic. [CAS 21109-95-5]

Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition

BaS(169.39)．約1000 ℃ に熱した炭酸バリウムに硫化水素と水素との等モル混合気体を通じると得られる．無色の立方晶系結晶．密度4.25 g cm^－3(15 ℃)．融点2200 ℃．空気中では酸化されてチオ硫酸バリウムを生じる．また，水分と二酸化炭素を吸収して硫化水素を発生する．水を加えると加水分解して硫化水素バリウムと水酸化バリウムを生じる．酸に溶けて硫化水素を発生する．エタノールに不溶．白色顔料リトポンの製造に用いられる．また，微量のほかの重金属を含むと蛍光を発するので，蛍光塗料にも用いられる．ほかに多硫化物として三硫化バリウムBaS₃[CAS 12231-01-5](黄色の結晶，400 ℃ で分解，水に易溶)，四硫化バリウム(淡赤色，斜方晶系柱状晶，200 ℃ で分解，水に易溶)があり，これらの混合物(硫化バリウム華という)は殺虫剤，皮革の脱毛剤として用いられる．有毒．[CAS 21109-95-5]

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