硫酸ストロンチウム

解説SrSO4(183.68)．天然には天青石として産出する．硫酸ストロンチウムは，可溶性ストロンチウム塩水溶液に，硫酸または硫酸アルカリを加えると得られる．無色の斜方晶系結晶．密度3.96 g cm－3．1156 ℃ で単斜晶系に転移する．融点1605 ℃．1130 ℃ から一部分解してSO3を生じる．水に難溶，エタノールに不溶，酸に微溶．濃硫酸と熱すると硫酸水素ストロンチウムを生じて溶ける．炭素で還元すれば硫化ストロンチウムが生成する．花火(赤色)，製紙工業，ガラス，陶磁器，セラミックス原料として用いられる．森北出版「化学辞典（第2版）

説明Strontium sulfate has the molecular formula of SrSO4 and the molecular weight of 183.6842 g/mol. It can be prepared by the reaction of sodium sulfate and strontium chloride: Na2SO4+SrCl2SrSO4+2NaCl Strontium sulfate occurs in nature as “celestite” and is mined from its natural deposits. Also, the sulfate can be made by reacting strontium oxide, hydroxide, or carbonate with dilute hydrochloric acid: SrO+H2SO4SrSO4+H2O SrCO3+H2SO4SrSO4+CO2+H2O No hydrates are known.Its hardness is 3.3 Mohs. It melts at 1608°C. Its solubility in water is 0.015 g/100 ml at 25°C and 0.014 g at 35°C. It is insoluble in ethanol and acetone, but slightly soluble in acids and alkalis. It is soluble in alkali chloride solutions. The heat of formation, △Hf, is –1453 kJ/mol with an entropy value, S0, of 117.0 J/mol K. Its Mohs Hardness is 3.0–3.5. A water solution has a pH of 7.5. Its specific gravity ranges from 3.8 to 4.0 g/cm3.Pure strontium sulfate precipitate consists of single crystals, about some tens of microns long, with distinctly visible growth steps. Crystals grown with polyvinyl sulfonate in stirred solutions show a striking change of habit: they are sponge-like structures, composed of minute crystallites, of size in the nanometer range. Crystallized strontium sulfate is utilized by a small group of protozoa as a main constituent of their skeleton. It is sometimes used to impart iridescence to glass and pottery glazes or used as a fining agent in crystal glass. There is very little demand for this salt in industry. It is available in limited quantities commercially.

使用Strontium Sulfate combined with Bi-2212 creates a superconductor.

定義strontium sulphate: A white solid,SrSO4; r.d. 3.96; m.p. 1605°C. It canbe made by dissolving strontiumoxide, hydroxide, or carbonate in sulphuricacid. It is used as a pigment inpaints and ceramic glazes and to providea red colour in fireworks.