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Thallous selenate, Tl2SeO4

Thallous selenate, Tl2SeO4, may be prepared by neutralising selenic acid with thallous hydroxide or carbonate. It crystallises from water, in which it is not very soluble, in orthorhombic prisms (a:b:c = 0.5551:1:0.7243) of density 6.875 at 20°, and is therefore isomorphous with potassium selenate (a:b:c = 0.5731:1:0.7319). The mean refractive index, 1.9575 for the D-line, is very high, the value for potassium selenate being 1.5396. The salt is insoluble in alcohol and ether; it melts above 400°.

Of the double selenates that thallous selenate may be anticipated to form with the selenates of the bivalent metals, only the zinc salt, thallous zinc selenate, Tl2SeO4.ZnSeO4.6H2O, has been described. It forms monoclinic crystals (a:b:c = 0.7479:1: 0.5022; β = 105°54') isomorphous with the corresponding double sulphates and with potassium zinc selenate (a:b:c = 0.7458:1:0.5073; β = 104°12').

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