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The thermal expansion and heat capacity of FeSb2 at ambient pressure agreeswith a picture of a temperature induced spin state transition within the Fet_{2g} multiplet. However, high pressure powder diffraction data show no signof a structural phase transition up to 7GPa. A bulk modulus B=84(3)GPa has beenextracted and the temperature dependence of the Gruneisen parameter has beendetermined. We discuss here the relevance of a Kondo insulator description forthis material.Comment: Physical Review B in press (2005

Kondo insulator description of spin state transition in FeSb2