Experimental and ab initio study of the hyperfine parameters of ZnFe2O4 whit defects

J. J. MELO QUINTERO; K. L. SALCEDO RODRÍGUEZ; G. A. PASQUEVICH; P. MENDOZA ZELIS; S. STEWART; C. E. RODRÍGUES TORRES; L. A ERRICO

HYPERFINE INTERACTIONS

springer

Lugar: Amsterdam; Año: 2016 vol. 237 p. 63 - 63

0304-3843

Pagina inicial: 63-1. Pagina final: 63-7.We present a combined Mossbauer and ab initio study on the influence ofoxygen-vacancies on the hyperfine and magnetic properties of the ZnFe2O4 spinel ferrite. Samples with different degree of oxygen-vacancies were obtained from zinc ferrite powder that was thermally treated at different temperatures up to 650 ◦C under vacuum. Theoretical calculations of the hyperfine parameters, magnetic moments and magnetic alignment have been carried out considering different defects such as oxygen vacancies and cation inversion. We show how theoretical and experimental approaches are complementary to characterize the local structure around Fe atoms and interpret the observed changes in the hyperfine parameters as the level of defects increases.