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 Hydride, SrH2

Winkler first obtained the Strontium Hydride, SrH2, in an impure state by heating equivalent quantities of strontium oxide and magnesium at a low red heat in an atmosphere of hydrogen. A slightly sintered, greyish-brown, readily oxidisable product was formed to which he gave the formula SrH.

Gautier prepared a white compound of composition SrH2 by heating a 45 per cent, alloy of strontium with cadmium, mixed with 7-8 per cent, of strontium oxide, in a nickel boat in an atmosphere of hydrogen, to incipient red heat. When absorption was complete, the cadmium could be completely volatilised by raising the temperature. By fusion, the hydride was made more compact, and so less easily affected by the atmosphere.

Reference has already been made to the formation of strontium hydride as an intermediate stage in the preparation of metallic strontium by Guntz and Roederer. The absorption of hydrogen by pure strontium begins at about 215° C., and proceeds vigorously at 260° C.

The heat of formation of the hydride from its elements is 38.4 Cal., calculated from the dissociation pressure at different temperatures, or 34.7 Cal., calculated from the heat of reaction with water and the heat of formation of strontium hydroxide solution from strontium.

Strontium hydride is a white hygroscopic body of melting-point above 650° C. It decomposes water very readily, with evolution of hydrogen and considerable rise of temperature. It reacts with chlorine when the temperature is slightly raised, and with bromine vapour at dull red heat, but not with liquid bromine even on boiling. It also reacts with the vapours of sulphur and iodine at red heat, and is attacked by nitrogen at about 600° C. At 70° C., and at a pressure greater than atmospheric, it reacts with sulphur dioxide, giving strontium hydrogen sulphite. In dry air it is very stable, and burns only slowly at red heat, but it reacts more vigorously in oxygen and with oxidising agents. It is a powerful reducing agent.

Gautier found that dissociation of strontium hydride begins at about 675° C., but, according to Ephraim and Michel, dissociation pressure measurements are difficult to carry out accurately, because there is absorption of hydrogen by the metal, or hydride, as well as combination, and also solution of the hydride in the metal. These investigators found the following dissociation pressures for a product containing 35 per cent, excess of strontium metal: -

Temperature, ° C.650692725754779803817
Pressure, mm. Hg200300400500600700760

Strontium hydride is less stable than calcium hydride and more so than the barium compound.

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