Chemical elements
    Physical Properties
    Chemical Properties
      Strontium Hydride
      Strontium Fluoride
      Strontium Chloride
      Strontium Perchloride
      Strontium Bromide
      Strontium Perbromide
      Strontium Iodide
      Strontium Periodides
      Mixed Halides
      Strontium Oxychloride
      Strontium Hypochlorite
      Strontium Chlorite
      Strontium Chlorate
      Strontium Perchlorate
      Strontium Oxybromide
      Strontium Bromate
      Strontium Oxyiodide
      Strontium Iodate
      Strontium Periodate
      Strontium Manganite
      Strontium Manganate
      Strontium Permanganate
      Strontium Suboxide
      Strontium Oxide
      Strontium Hydroxide
      Strontium Peroxide
      Strontium Diperoxyhydrate
      Strontium Hydride
      Strontium Hydrosulphide
      Strontium Polysulphides
      Strontium Oxysulphide
      Strontium Thiosulphate
      Strontium Hyposulphite
      Strontium Sulphite
      Strontium Dithionate
      Strontium Tetrathionate
      Strontium Sulphate
      Acid Strontium Sulphate
      Strontium Pyrosulphate
      Strontium Selenide
      Strontium Selenite
      Strontium Selenate
      Strontium Telluride
      Strontium Tellurite
      Strontium Tellurate
      Strontium Chromate
      Strontium Dichromate
      Strontium Trichromate
      Strontium Chlorochromate
      Strontium Molybdate
      Complex Strontium Molybdates
      Strontium Tungstate
      Strontium Uranate
      Strontium Nitride
      Strontium Azide
      Strontium Ammonium
      Strontium Hexammoniate
      Strontium Amide
      Strontium Imide
      Strontium Imidosulphonate
      Strontium Hyponitrite
      Strontium Nitrohydroxylaminate
      Strontium Nitrite
      Strontium Nitrate
      Strontium Phosphide
      Strontium Dihydrohypophosphite
      Strontium Hydrophosphite
      Strontium Dihydrophosphite
      Strontium Orthophosphates
      Strontium Pyrophosphate
      Strontium Metaphosphate
      Basic Strontium Phosphate
      Strontium Arsenide
      Strontium Orthoarsenites
      Strontium Pyroarsenite
      Strontium Metarsenite
      Strontium Orthoarsenates
      Strontium Pyroarsenate
      Strontium Thioarsenites
      Strontium Thio-oxyarsenates
      Strontium Thioantimonite
      Strontium Antimonate
      Strontium Orthovanadate
      Strontium Metavanadate
      Strontium Pervanadate
      Strontium Carbide
      Strontium Carbonyl
      Strontium Formate
      Strontium Acetate
      Strontium Oxalate
      Strontium Carbonate
      Strontium Trithiocarbonate
      Strontium Perthiocarbonate
      Strontium Cyanide
      Strontium Cyanamide
      Strontium Thiocyanate
      Strontium Silicide
      Strontium Silicate
      Strontium Fluosilicate
      Strontium Stannate
      Strontium Orthoplumbate
      Strontium Titanate
      Strontium Zirconate
      Strontium Boride
      Strontium Borates
      Strontium Aluminates
      Strontium Ferrate
    PDB 1cs7-2spt
    PDB 2woh-4ds7

Strontium Oxide, SrO

Strontium Oxide, SrO, can be obtained by heating strongly the carbonate, hydroxide, or nitrate. The first of these requires a higher temperature for decomposition than calcium carbonate. It may also be formed by the direct combination of strontium and oxygen, the heat evolved being 139.64 Cal. Or 141.2 Cal. Commercially the chief source of the oxide is the sulphate, celestine. Various methods of treatment are possible. The sulphate may be calcined with carbon to form the sulphide and the latter transformed into the hydroxide by the action of a base and again calcined; or the sulphate may be heated in a current of water vapour and carbon monoxide; or, finally, it may be fused with sodium carbonate under pressure, and the resulting carbonate calcined. The oxide has also been prepared by heating the carbonate with the carbide.

As usually obtained, strontium oxide is a white amorphous solid of density varying from 3.93 to 4.61, depending upon the method of preparation. It forms cubical crystals, however, of density 4.75 when prepared by very slow calcination of the nitrate. The transparent liquid, obtained by fusion in the electric arc at about 3000° C., which is more easily accomplished than in the case of calcium oxide, forms on cooling a confused mass of crystals. A crystallised specimen may also be obtained by heating a mixture of strontium carbonate with lithium carbonate.

Sulphuretted hydrogen reacts with strontium oxide in the cold, forming water and sulphur with considerable heat evolution. Sulphur dioxide and carbon dioxide react with strontium oxide when heated, but not in the cold. In the case of carbon dioxide the reaction may become so vigorous that the product is incandescent, and a temperature of 1050° C. may be reached.

Strontium oxide dissolves in fused strontium chloride, one molecule of the former saturating three of the latter.

From a consideration of heat phenomena, de Forcrand concluded that the molecule of strontium oxide should be regarded as a condensed molecule with the formula (SrO)n.

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