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By means of high-resolution neutron diffraction, a structural phase transition in MACROBUTTONSr 2-x Ca x FeMoO 6 series as a function of x and/or temperature is reported. When this transition is thermally induced, a broad region with phase coexistence is found. (Fe,Mo)-O bond-distances remain almost constant in the series but, at low T, mean Fe-O (Mo-O) bond lengths...
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