Effect of increasing Sr content on structural and physical properties of K2NiF4-type phase GdSrFeO4
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- 作者：Suram Singh ; Devinder Singh ; drdssambyal@rediffmail.com
- 关键词：Ceramic method ; Rietveld analysis ; Magnetic properties ; Transport properties
- 刊名：Ceramics International
- 出版年：2017
- 出版时间：15 February 2017
- 年：2017
- 卷：43
- 期：3
- 页码：3369-3376
- 全文大小：1586 K
- 卷排序：43
文摘
The structural, magnetic and electrical properties of Gd1−xSr1+xFeO4 (0≤ x≤0.4) have been discussed in terms of the mixed valence state of Fe (Fe3+/Fe4+). The Rietveld refinements of powder X-ray diffraction data reveal that all the phases crystallizes with tetragonal unit cell in the space group I4/mmm. The lattice constant a decreases while there is increase in c parameter with increase in x. All the phases are antiferromagnetic and the increase in Weiss constant (θp) with Sr2+ content could be attributed to the generation of the Fe4+ ions which introduces the ferromagnetic double-exchange Fe3+−O2-−Fe4+ interactions. The materials show semiconducting behavior and the electronic conduction in these materials is obtained via hopping of electrons from the occupied sites, Fe3+ ions, to the unoccupied sites, Fe4+ ions.