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Synthesis and Rietveld refinements of new ceramics Sr2CaFe2WO9 and Sr2PbFe2TeO9 perovskites.
- Source :
- Powder Diffraction; Jun2018, Vol. 33 Issue 2, p134-140, 7p
- Publication Year :
- 2018
-
Abstract
- Ceramics of Sr<subscript>2</subscript>CaFe<subscript>2</subscript>WO<subscript>9</subscript> and Sr<subscript>2</subscript>PbFe<subscript>2</subscript>TeO<subscript>9</subscript> double perovskites have been prepared in polycrystalline form by solid-state technique, in the air. The crystalline structure was analyzed using X-ray powder diffraction (XRPD) at room temperature. Rietveld analysis of XRPD patterns show that both compounds adopt a tetragonal structure with space group <italic>I</italic>4/<italic>m</italic>, with unit cell parameters <italic>a</italic> = 5.5453(1) Å, <italic>c</italic> = 7.8389(1) Å for Sr<subscript>2</subscript>CaFe<subscript>2</subscript>WO<subscript>9</subscript>, and <italic>a</italic> = 5.5994(15) Å, <italic>c</italic> = 7.8979(30) Å for Sr<subscript>2</subscript>PbFe<subscript>2</subscript>TeO<subscript>9</subscript>. A certain degree of anti-site disordering of W and/or Te and Fe on the B –sites have been detected, indicating the presence of a partial amount of W and/or Te at Fe positions and vice versa. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 08857156
- Volume :
- 33
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Powder Diffraction
- Publication Type :
- Academic Journal
- Accession number :
- 130439952
- Full Text :
- https://doi.org/10.1017/S0885715618000222