Phase relationships and structural investigations in TmSe and alloys

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Abstract
The valence of Tm can be controlled in TmSe between + 2.71 and + 3.0 by adjusting the non-stoichiometry between 1.04 ⩾ x ⩾ 0.91 (x = mole Tm/mole Se). Variation of the Tm valence between + 2.9 and + 2.0 is achieved in the mixed crystal system TmSe1-x Tex by varying x in the range of 0 ⩽ x ⩽ 1 ; pressure induced phase transitions show lattice instabilities in the 0.2 ⩽ x ⩽ 0.5 range. In both TmSe and TmSe1-xTex lattice instabilities are accompanied by strong increase of the vacancies (up to 10 %). The phase diagram of Tm-Se was investigated up to 2 300 °C and the heat of reaction of TmSe with HCl has been studied as a function of the stoechiometry

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