Graetsch, Heribert A., Pandey, Chandra Shehkar, Schreuer, Juergen ORCID: 0000-0002-8611-6842, Burianek, Manfred and Muehlberg, Manfred (2014). Incommensurate modulations of relaxor ferroelectric Ca0.24Ba0.76Nb2O6 (CBN24) and Ca0.31Ba0.69Nb2O6 (CBN31). Acta Crystallogr. Sect. B-Struct. Sci.Cryst. Eng. Mat., 70. S. 743 - 750. CHESTER: INT UNION CRYSTALLOGRAPHY. ISSN 2052-5206

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Abstract

CBN crystals show a one- and a two-dimensionally modulated modification. The former is isotypic with orthorhombic Ba4Na2Nb10O30 and the latter with the tetragonal tungsten bronze type of crystal structure. The orthorhombic form irreversibly transforms to the tetragonal polymorph at the ferroelectric phase transition near 603 K. Orthorhombic and tetragonal CBN24 slightly differ in the distribution of the Ba and Ca atoms over the incompletely filled Me1 and Me2 sites. The tetragonal symmetry is further broken in orthorhombic CBN24 by different amplitudes of the positional modulations of O atoms which are symmetrically equivalent in the TTB structure. A similar orthorhombic phase of CBN31 could be obtained by quenching from 1473 K.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Graetsch, Heribert A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pandey, Chandra ShehkarUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schreuer, JuergenUNSPECIFIEDorcid.org/0000-0002-8611-6842UNSPECIFIED
Burianek, ManfredUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Muehlberg, ManfredUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-432326
DOI: 10.1107/S2052520614011676
Journal or Publication Title: Acta Crystallogr. Sect. B-Struct. Sci.Cryst. Eng. Mat.
Volume: 70
Page Range: S. 743 - 750
Date: 2014
Publisher: INT UNION CRYSTALLOGRAPHY
Place of Publication: CHESTER
ISSN: 2052-5206
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
STRONTIUM BARIUM NIOBATE; SBN SINGLE-CRYSTALS; COMPOSITION RANGE; TEMPERATURE; SRXBA1-XNB2O6; GROWTHMultiple languages
Chemistry, Multidisciplinary; CrystallographyMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/43232

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