Synthesis structural analysis and dielectric properties of the double layer Aurivillius compound_ceramics international

Wendari, T P, Arief, Syukri, Mufti, Nandang, Suendo, Veinardi, Prasetyo, Anton, Ismunandar, Ismunandar, Baas, Jacob, Blake, G R and Zulhadjri, Zulhadjri (2019) Synthesis structural analysis and dielectric properties of the double layer Aurivillius compound_ceramics international. Ceramics International, 45. pp. 17276-17282. ISSN 0272-8842

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Abstract

The double-layer Aurivillius phases Pb1- xBi1.5+2xLa0.5Nb2-xMnxO9 (x=0, 0.1, 0.3, and 0.5) were synthesized by a molten salt method using a mixture of K2SO4/Na2SO4. The effect of composition on the structure, morphology and dielectric properties was investigated. X-ray diffraction showed that single-phase samples with anon-polar, orthorhombic A21am structure were obtained for x=0, 0.1 and 0.3. The unit cell becomes more orthorhombic with increasing x as the degree of distortion of the BO6 octahedra in the perovskite layer increases. Raman spectroscopy showed the typical modes of the orthorhombic double-layer Aurivillius structure and indicated that the La3+ ions prefer to occupy the perovskite A-site, Mn3+ occupies the B-site, and the Pb2+ ions are found in the Bi2O2 layer. The morphology of the samples was probed by scanning electron microscopy, which showed anisotropic, plate-like crystallites that increased in size with increasing x. The dielectric constant significantly increased with x, and the ferroelectric properties became more relaxor-like.

Item Type:	Journal Article
Keywords:	double-layer aurivillius phase; molten salt method; dielectric properties; anisotropic morphology; relaxor ferroelectric; raman analysis
Subjects:	03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030206 Solid State Chemistry 03 CHEMICAL SCIENCES > 0306 Physical Chemistry (incl. Structural) > 030606 Structural Chemistry and Spectroscopy
Divisions:	Faculty of Mathematics and Sciences > Department of Chemistry
Depositing User:	Dr Anton Prasetyo
Date Deposited:	27 Oct 2020 11:10

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