The magnetoelectric perovskite Sr{sub 2}CoMoO{sub 6}: An insight from neutron powder diffraction

• Published in: Materials research bulletin Vol. 40; no. 5
• Main Authors: Ivanov, S.A., Eriksson, S.-G., Tellgren, R., Rundloef, H., Tseggai, M.
• Format: Journal Article
• Language: English
• Published: United States 18.05.2005
• Subjects: ANTIFERROMAGNETISM; CERAMICS; CRYSTALLOGRAPHY; DATA ANALYSIS; ELECTRICAL PROPERTIES; FCC LATTICES; FERROELECTRIC MATERIALS; MAGNETIC FIELDS; MATERIALS SCIENCE; NEUTRON DIFFRACTION; PEROVSKITE; PHASE TRANSFORMATIONS; POLYCRYSTALS; SPACE GROUPS; TEMPERATURE DEPENDENCE; TETRAGONAL LATTICES
• DOI: 10.1016/j.materresbull.2005.01.012
• ISSN: 0025-5408

A study of the crystallographic and magnetic structure of the double perovskite Sr{sub 2}CoMoO{sub 6} (SCMO) has been carried out on a polycrystalline sample using neutron powder diffraction (NPD) data between 10 and 700 K. An analysis of the NPD patterns at room temperature has shown that this compound crystallises in the tetragonal space group I4/m with a = 5.5616(1) A and c 7.9470(2) A and has a 1:1 ordered arrangement of Co and Mo at the B-sites. This compound undergoes a I4/m {yields} Fm3m improper ferroelectric phase transition near 560 K. A low-temperature antiferromagnetic ordering (below T {sub N} = 36 K) has been followed from sequential NPD data analysis. The antiferromagnetic structure is defined by the propagation vector k = (1/2, 0, 1/2). In addition to the obtained experimental results on magnetic and electric properties some aspects of magnetoelectricity in this perovskite are also discussed.