The Thermal Expansion of Iron Ditelluride

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Abstract
The variation with temperature of the unit cell dimensions of two samples of orthorhombic iron ditelluride FeTe2 00 and FeTe2 10, has been measured between 17°C and 550°C using the x-ray powder method. It is found that Gruneisen's relation between the volume expansion coefficient and specific heat is adequate for FeTe2 00, but Gruneisen and Goens' theory of the linear expansion coefficients is not satisfactory. A comparison between the expansion rates of FeTe2 00 and FeSb2 lends weight to the proposed existence of additional metalloid-metalloid bonds in the latter compound. The difference between the expansion curves of FeTe2 00 and FeTe2 10 cannot be explained in terms of additional covalent bonds and must be attributed to an increase in the ionic character of the bonds, which is associated with the vacancies present at the Te-rich composition.

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