硫酸ストロンチウム 化学特性,用途語,生産方法
外観
白色～ほとんど白色, 粉末
溶解性
水, 希塩酸, 希硝酸に微溶。エタノールに不溶。水にほとんど溶けない。エタノールに不溶。塩酸に溶け、水及びエタノールにほとんど溶けない。
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+SrCl2?SrSO4+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+H2SO4?SrSO4+H2O
SrCO3+H2SO4?SrSO4+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, △H
f, 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.
化学的特性
Milky white powder
使用
Strontium Sulfate combined with Bi-2212 creates a superconductor.
定義
strontium sulphate: A white solid,SrSO
4; 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.
硫酸ストロンチウム 上流と下流の製品情報
原材料
準備製品