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The thermal evolution of the crystal structure of PrSr 3 Co 1.5 Fe 1.5 O 10– d  , a member of the  n  = 3 family of Ruddlesden-Popper compounds, has been studied by means of variable temperature synchrotron X-ray powder diffraction combined with room temperature neutron diffraction studies. This structure takes the ideal tetragonal  I 4/ mmm  ( n °139) space group. The possibility of symmetry lowering to the  Pbca  ( n °61) space group by slight tilting and rotation of the oxygen atoms around the octahedral B site is discussed. The non linear thermal expansion of the compound in air is caused by a chemical expansion accompanying the loss of oxygen that comes in addition to normal thermal expansion. A mechanism describing the creation of oxygen vacancies is proposed.

Temperature dependant X-ray diffraction study of PrSr 3 Co 1.5 Fe 1.5 O 10– d ; n = 3 Ruddlesden-Popper phase