Hoffmann, Kristin, Murshed, M. Mangir, Fischer, Reinhard X., Schneider, Hartmut and Gesing, Thorsten M. ORCID: 0000-0002-4119-2219 (2014). Synthesis and characterization of mullite-type (Al1-xGax)(4)B2O9. Z. Krist.-Cryst. Mater., 229 (10). S. 699 - 709. BERLIN: WALTER DE GRUYTER GMBH. ISSN 2196-7105

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Abstract

Mullite-type (Al1-xGax)(4)B2O9 compounds were synthesized using the glycerine method. The end members Al4B2O9 and Ga4B2O9 were produced at different temperatures. Starting from the Ga4B2O9 composition the incorporation limit of Ga ranges between 60 and 70 mol-%, while starting from Ga4B2O9 the Al incorporation limit is 70 mol-% in the Ga4B2O9 structure. The crystal structures were refined from the X-ray powder diffraction data and analyzed by the Rietveld method. The positions of B atoms were determined by distance least squares modeling. The temperature-dependent investigations demonstrate that the stability of a given member is a function of Al/Ga ratio in the structure. The incorporation of Ga in the Al4B2O9 structures leads to a successive decrease of the decomposition temperatures. Pure Al4B2O9 decomposes above 1323 K, whereas pure Ga4B2O9 is stable up to 1073 K. The thermal expansions of the lattice parameters were fit using extended Gruneisen first-order approximation for the zero-pressure equation of state. Changes of the internal energy of the crystal were calculated by the Debye-Einstein-Anharmonicity model. The thermal stability of each member has been explained in terms of the obtained Debye temperature.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Hoffmann, KristinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Murshed, M. MangirUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fischer, Reinhard X.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schneider, HartmutUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gesing, Thorsten M.UNSPECIFIEDorcid.org/0000-0002-4119-2219UNSPECIFIED
URN: urn:nbn:de:hbz:38-452815
DOI: 10.1515/zkri-2014-1785
Journal or Publication Title: Z. Krist.-Cryst. Mater.
Volume: 229
Number: 10
Page Range: S. 699 - 709
Date: 2014
Publisher: WALTER DE GRUYTER GMBH
Place of Publication: BERLIN
ISSN: 2196-7105
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
THERMAL-EXPANSION; NEUTRON-DIFFRACTION; CRYSTAL-STRUCTUREMultiple languages
CrystallographyMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/45281

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