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Summer Research Fellowship Programme of India's Science Academies

Study of Magnetic Pyrochlore Oxides

Tanuja

Kalyan Post Graduate College, Bhilai Nagar, Durg, Chhattisgarh 490006

Dr. Chandan Upadhyay

Indian Institute of Technology (Banaras Hindu University), Varanasi, Uttarpradesh 221005

Abstract ​ ​ ​​​​

As we see, the world is moving towards broader use of different materials; in such a case, research over pyrochlore oxides can never be ignored. There is plenty of opportunities for innovations and research in the field of this material. Our study focuses on the synthesis of Er2Ti2O7 and Dy2GeO5 and crystallographic characterization of XY pyrochlores. Due to a prominent place in all synthesis techniques for the preparation of polycrystalline solids from a mixture of solid reagent materials, the ‘solid-state synthesis’ method has been employed. The crystal structure of these derivatives of pyrochlore oxides was studied. Powder data were used for the study of diffraction through X-ray diffractometer. Rietveld refinement through Fullprof Analysis suit software has employed for the refinement of XRD data. Initially ‘Si’ Powder data has been taken for the characterization. The ‘Chi squared value’, determining the goodness of fit, obtained for the ‘Si’ is χ2 = 2.86. The results of refinement confirm the cubic phase of Er2Ti2O7 along with Fd-3m space group with chi-squared value χ2 = 3.242. The special turn in our study came when we were dealing with pyrochlore germanate Dy2GeO5, which was exhibiting different behavior from previously reported space group and give the exact profile that fits with various space groups. The magnetic behavior of pyrochlore oxides has been gaining attention for the past few years. The structural arrangement provides a framework for magnetic frustration, which, along with lots of applications, are opening up the research opportunities in this field. Also, their environmental-friendly applications play an important role in promoting the ‘Green Chemistry’. It can be speculated that, they can be used in various fields including everyday life and technological fields.​

Keywords: pyrochlore, powder, diffraction, frustration, magnetic etc.

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