at Google ScholarTitle 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
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 |