Effect of Fe-Doping on Thermal Expansion and Stability of Bismuth Magnesium Tantalate Pyrochlorere
A continuous series of solid solutions (Bi<sub>1.5</sub>Mg<sub>0.75−x</sub>Fe<sub>x</sub>Ta<sub>1.5</sub>O<sub>7±Δ</sub> (x = 0–0.75)) with the pyrochlore structure were synthesized with the solid-phase method. It was shown that iron, like...
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| author | Nadezhda A. Zhuk Maria G. Krzhizhanovskaya Sergey V. Nekipelov Viktor N. Sivkov Danil V. Sivkov |
| author_facet | Nadezhda A. Zhuk Maria G. Krzhizhanovskaya Sergey V. Nekipelov Viktor N. Sivkov Danil V. Sivkov |
| author_sort | Nadezhda A. Zhuk |
| collection | DOAJ |
| description | A continuous series of solid solutions (Bi<sub>1.5</sub>Mg<sub>0.75−x</sub>Fe<sub>x</sub>Ta<sub>1.5</sub>O<sub>7±Δ</sub> (x = 0–0.75)) with the pyrochlore structure were synthesized with the solid-phase method. It was shown that iron, like magnesium, is concentrated in the structure in the octahedral position of tantalum. Doping with iron atoms led to an increase in the upper limit of the thermal stability interval of magnesium-containing pyrochlore from 1050 °C (x = 0) up to a temperature of 1140 °C (x = 1). The unit cell constant <i>a</i> and thermal expansion coefficient (TEC) increase uniformly slightly from 10.5018 Å up to 10.5761 Å and from 3.6 up to 9.3 × 10<sup>−6</sup> °C<sup>−1</sup> in the temperature range 30–1100 °C. The effect of iron(III) ions on the thermal stability and thermal expansion of solid solutions was revealed. It has been established that the thermal stability of iron-containing solid solutions correlates with the unit cell parameter, and the lower the parameter, the more stable the compound. The TEC value, on the contrary, is inversely proportional to the cell constant. |
| first_indexed | 2024-03-09T18:52:32Z |
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| id | doaj.art-1722606a0b864d32b5f101be4b8f05ee |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T18:52:32Z |
| publishDate | 2022-10-01 |
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| spelling | doaj.art-1722606a0b864d32b5f101be4b8f05ee2023-11-24T05:38:54ZengMDPI AGMaterials1996-19442022-10-011521766810.3390/ma15217668Effect of Fe-Doping on Thermal Expansion and Stability of Bismuth Magnesium Tantalate PyrochlorereNadezhda A. Zhuk0Maria G. Krzhizhanovskaya1Sergey V. Nekipelov2Viktor N. Sivkov3Danil V. Sivkov4Institute of Natural Sciences, Syktyvkar State University, Oktyabrsky Prospect, 55, 167001 Syktyvkar, RussiaInstitute of Earth Sciences, Saint Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, RussiaInstitute of Physics and Mathematics of the Komi Science Center UB RAS, Oplesnina St. 4, 167982 Syktyvkar, RussiaInstitute of Physics and Mathematics of the Komi Science Center UB RAS, Oplesnina St. 4, 167982 Syktyvkar, RussiaInstitute of Physics and Mathematics of the Komi Science Center UB RAS, Oplesnina St. 4, 167982 Syktyvkar, RussiaA continuous series of solid solutions (Bi<sub>1.5</sub>Mg<sub>0.75−x</sub>Fe<sub>x</sub>Ta<sub>1.5</sub>O<sub>7±Δ</sub> (x = 0–0.75)) with the pyrochlore structure were synthesized with the solid-phase method. It was shown that iron, like magnesium, is concentrated in the structure in the octahedral position of tantalum. Doping with iron atoms led to an increase in the upper limit of the thermal stability interval of magnesium-containing pyrochlore from 1050 °C (x = 0) up to a temperature of 1140 °C (x = 1). The unit cell constant <i>a</i> and thermal expansion coefficient (TEC) increase uniformly slightly from 10.5018 Å up to 10.5761 Å and from 3.6 up to 9.3 × 10<sup>−6</sup> °C<sup>−1</sup> in the temperature range 30–1100 °C. The effect of iron(III) ions on the thermal stability and thermal expansion of solid solutions was revealed. It has been established that the thermal stability of iron-containing solid solutions correlates with the unit cell parameter, and the lower the parameter, the more stable the compound. The TEC value, on the contrary, is inversely proportional to the cell constant.https://www.mdpi.com/1996-1944/15/21/7668bismuth tantalate pyrochloreironFeMg codopingthermal expansionthermal stability |
| spellingShingle | Nadezhda A. Zhuk Maria G. Krzhizhanovskaya Sergey V. Nekipelov Viktor N. Sivkov Danil V. Sivkov Effect of Fe-Doping on Thermal Expansion and Stability of Bismuth Magnesium Tantalate Pyrochlorere Materials bismuth tantalate pyrochlore iron FeMg codoping thermal expansion thermal stability |
| title | Effect of Fe-Doping on Thermal Expansion and Stability of Bismuth Magnesium Tantalate Pyrochlorere |
| title_full | Effect of Fe-Doping on Thermal Expansion and Stability of Bismuth Magnesium Tantalate Pyrochlorere |
| title_fullStr | Effect of Fe-Doping on Thermal Expansion and Stability of Bismuth Magnesium Tantalate Pyrochlorere |
| title_full_unstemmed | Effect of Fe-Doping on Thermal Expansion and Stability of Bismuth Magnesium Tantalate Pyrochlorere |
| title_short | Effect of Fe-Doping on Thermal Expansion and Stability of Bismuth Magnesium Tantalate Pyrochlorere |
| title_sort | effect of fe doping on thermal expansion and stability of bismuth magnesium tantalate pyrochlorere |
| topic | bismuth tantalate pyrochlore iron FeMg codoping thermal expansion thermal stability |
| url | https://www.mdpi.com/1996-1944/15/21/7668 |
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