The influence of chromium substitution on crystal structure and shift of Néel transition in GdFe_1−xCr_xO₃ mixed oxides

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• 作者：Krzysztof Orlinski ; Ryszard Diduszko…
• 关键词：GdFe1−xCrxO3 ; Gadolinium ferrochromite ; GdFeO3 ; GdCrO3 ; Dilatometry ; Mössbauer spectroscopy ; Structure
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：127
• 期：1
• 页码：181-187
• 全文大小：825KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Physical Chemistry; Analytical Chemistry; Polymer Sciences; Inorganic Chemistry; Measurement Science and Instrumentation;
• 出版者：Springer Netherlands
• ISSN：1588-2926
• 卷排序：127

文摘

The gadolinium ferrochromite (GdFe_1−xCr_xO₃) was used as a case study of influence of chromium substitution on the perovskite structure in the entire composition range. By exploiting thermal analysis techniques (dilatometry, differential thermal analysis) the influence of chromium was investigated in the context of thermal stability of the canted antiferromagnetic ordering. It was found that the higher the chromium concentration was, the more the Néel temperature decreased, e.g., substitution of 26 % of iron atoms corresponded to a depression of about 60 K with respect to undoped gadolinium ferrite. For higher chromium concentrations the mixed gadolinium ferrochromite was paramagnetic at room temperature. Additional information on the crystal structure and, qualitatively, on the magnetic ordering as well was derived from the results of X-ray diffraction and Mössbauer spectroscopy measurements. For chromium content higher than 10 % the gadolinium ferrochromite may be regarded as a solid solution. For lower concentrations, however, a possible formation of clusters with different Fe/Cr ratio occurs as suggested by Mössbauer spectra.