Dielectric relaxation induced internal electric field and its effect on magnetoelectric state in Co4Nb2O9. Issue 6 (8th January 2018)

• Record Type: Journal Article
• Authors: Xie, Yuanmiao; Zang, Hao; Ceng, Wen‐Dan; Wang, Shuting; Wang, Chunchang
• Is Part Of: Journal of the American Ceramic Society. Volume 101:Issue 6(2018)
• Page Start: 2347
• Page End: 2352
• Publication Date: 2018-01-08
• Subjects: dielectric relaxation -- magnetoelectrics -- pyroelectricity; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.15400
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: Pyrocurrent and dielectric properties of magnetoelectric antiferromagnet Co4 Nb2 O9 have been investigated. The sample shows 2 thermally activated dielectric relaxations in the temperature range far above Néel temperature with the low‐ and high‐temperature ones being a dipolar and Maxwell‐Wagner relaxations, respectively. Two types of dipoles: relaxing dipoles and magnetic‐field‐induced dipoles were found in the sample. An internal electric field is formed due to the ordering of relaxing dipoles. Three current peaks were observed. The 2 higher temperature current peaks correspond to the dielectric relaxations. The lowest temperature current peak contains a positive tip and negative dip. The tip and dip are related to the depolarization of ferroelectricity induced by external and internal fields, respectively.