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Structural aspects of pyrochlores stability: influence of the cations in [8]A, [6]B positions and lattice parameters

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A Correction to this article was published on 04 October 2021

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Abstract

The influence of mole fraction and nature of the cations in positions [8]A and [6]B of the pyrochlores containing Na+, Ca2+, Cd2+, U4+, Nb5+, Ta5+, Ti4+, Sb5+, Zr4+, V3+, V4+, W5+, W6+ synthesized under hydrothermal conditions at 800 °C, 200 MPa and controlled oxygen fugacity in NaF solution of 1.0 mol·kg−1 H2O on lattice parameters has been considered. The unit cell parameters of the fluorpyrochlores where for Nb5+ or Ta5+ were substituted by other cations showing distinct linear variations from the effective cations radii in positions [8]A and [6]B. Based on the literary data analysis, the two-parameter nonlinear equation describing dependence of pyrochlore lattice parameters on the cation radii for the oxide-pyrochlores has been proposed.

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Acknowledgements

The authors appreciate Nataliya Kotova, Olga Samokhvalova, Tatyana Dokina, Gleb Borodulin, and Tatiana Kazachenko for their help in the investigations and improvement of the manuscript, Veniamin Polyakov for his author’s software we used in numerical calculation. We would like to thank the editor of the Journal, prof. Daniel Atencio, and second anonymous reviewer for their constructive remarks that greatly improved clarity and quality of the manuscript. The work was supported by Grants RFBR 14-05-00145, 20-05-00307, and project No AAAA-A18-118020590150-6 of the IEM RAS.

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Correspondence to Alexander F. Redkin.

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Redkin, A., Ionov, A., Nekrasov, A. et al. Structural aspects of pyrochlores stability: influence of the cations in [8]A, [6]B positions and lattice parameters. Phys Chem Minerals 47, 47 (2020). https://doi.org/10.1007/s00269-020-01114-6

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  • DOI: https://doi.org/10.1007/s00269-020-01114-6

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