Room-temperature zero thermal expansion in a cubic perovskite oxide SrCu_3Fe_(4-x)Mn_xO_(12)

摘要

A zero thermal expansion in a wide temperature range including room temperature has been achieved in a cubic perovskite oxide SrCu_3Fe_(4-x)Mn_xO_(12) for x= 1.5. Partial substitution of Mn for Fe in SrCu_3Fe_4O_(12) systematically changes the linear thermal expansion coefficient from negative [-6.4(2), -5.7(5), and -1.88(11) ppm/K for x = 0.5, 1, and 1.25, respectively] to almost zero [0.67(15) ppm/K for x = 1.5] to positive [2.97(17) ppm/K for x = 1.75] and the operational temperature window shifts to higher temperature ranges above room temperature. Crystal structure analysis and Moessbauer spectroscopy reveal that the zero thermal expansion for x =1.5 composition is induced by intermetallic charge transfer between Cu and (Fe,Mn) ions. These results display the high potential of SrCu_3Fe_(4-x)Mn_xO_(12) for the development of zero thermal expansion materials.