Thulium(III) selenate is an inorganic compound, with the chemical formula Tm2(SeO4)3. It can be obtained by reacting a thulium(III) oxide and selenic acid solution and crystallizing it. It crystallises with ammonium selenate in an aqueous solution to obtain NH4Tm(SeO4)2·3H2O.
Thulium(III) selenate decomposes at high temperatures and passes through Tm2(SeO3)3 to finally obtain the oxide Tm2O3.
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