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Solubility of lanthanum in strontium titanate in oxygen-rich atmospheres

Title data

Moos, Ralf ; Bischoff, Tilman ; Menesklou, Wolfgang ; Härdtl, Karl Heinz:
Solubility of lanthanum in strontium titanate in oxygen-rich atmospheres.
In: Journal of Materials Science. Vol. 32 (1997) Issue 16 . - pp. 4247-4252.
ISSN 1573-4803
DOI: https://doi.org/10.1023/A:1018647117607

Official URL: Volltext

Abstract in another language

Perovskite (ABO3)-type lanthanum substituted strontium titanate ceramics (lanthanum content x), which had been sintered in pure oxygen at 1400 °C, were investigated from x = 0 up to x = 0.6 by light optical and scanning electron microscopic means in conjunction with X-ray analysis, X-ray diffraction, and pyconometry in order to determine the mechanism being responsible for the compensation of the electronic excess charge resulting from the "donor" lanthanum. A pure strontium vacancy compensation mechanism was observed for lanthanum contents up to x = 0.3. Above x = 0.4 titanium vacancies occur additionally but their concentration remains negligible compared to the predominating strontium vacancies. No indication of a solubility limit of lanthanum at x = 0.4, as stated in former works was observed. At x = 0.5 and 0.6 the lattice structure was found to be slightly distorted, tetragonally and orthorhombically, respectively. The lattice parameter obeys Vegard’s law up to the end member La2/3□1/3TiO3 (□: vacant site). These results were completely confirmed by pycnometry data.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Result of work at the UBT: No
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 03 Feb 2015 09:28
Last Modified: 04 Apr 2016 07:36
URI: https://eref.uni-bayreuth.de/id/eprint/6174