Study of the oxygen-deficient double perovskite PrBaCo2O5.75

J.L. GARCÍA MUÑOZ; C. FRONTERA; A. LLOBET; A E. CARRILLO; A. CANEIRO; M. A. G. ARANDA; C. RITTER; E DOORYEE

PHYSICA B - CONDENSED MATTER

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2004 vol. 350 p. 277 - 279

0921-4526

The oxygen-deficient perovskite PrBaCo2O5.75 was prepared by solid-state reaction followed by well-definedannealing and cooling conditions. The oxygen content was measured by thermogravimetric analyses and neutrondiffraction. The structural and magnetic properties of this cobaltite that formally corresponds to Co4+/Co3+=1:3 havebeen investigated. Although neutron data are consistent with a tetragonal ap
ap
2ap cell, synchrotron measurementsrevealan orthorhombic symmetry and the doubling of the b-axis owing to the ordering of oxygen vacancies along a.PrBaCo2O5.75 presents antiferromagnetic order below TNE140 K. From neutron diffraction, using a single moment Gtypemodel, the ordered moment at 2K is found to be 1.14(6)mB/Co ion.