{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T04:43:10Z","timestamp":1760244190524,"version":"build-2065373602"},"reference-count":37,"publisher":"MDPI AG","issue":"21","license":[{"start":{"date-parts":[[2022,10,31]],"date-time":"2022-10-31T00:00:00Z","timestamp":1667174400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"The Center of X-ray diffraction studies at the Research Park of St. Petersburg State University (XRD Center SPbU)","award":["N 075-15-2021-1351"],"award-info":[{"award-number":["N 075-15-2021-1351"]}]},{"name":"Ministry of Science and Higher Education of Russia","award":["N 075-15-2021-1351"],"award-info":[{"award-number":["N 075-15-2021-1351"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>A continuous series of solid solutions (Bi1.5Mg0.75\u2212xFexTa1.5O7\u00b1\u0394 (x = 0\u20130.75)) 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 \u00b0C (x = 0) up to a temperature of 1140 \u00b0C (x = 1). The unit cell constant a and thermal expansion coefficient (TEC) increase uniformly slightly from 10.5018 \u00c5 up to 10.5761 \u00c5 and from 3.6 up to 9.3 \u00d7 10\u22126 \u00b0C\u22121 in the temperature range 30\u20131100 \u00b0C. 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.<\/jats:p>","DOI":"10.3390\/ma15217668","type":"journal-article","created":{"date-parts":[[2022,11,1]],"date-time":"2022-11-01T06:01:28Z","timestamp":1667282488000},"page":"7668","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Effect of Fe-Doping on Thermal Expansion and Stability of Bismuth Magnesium Tantalate Pyrochlorere"],"prefix":"10.3390","volume":"15","author":[{"given":"Nadezhda A.","family":"Zhuk","sequence":"first","affiliation":[{"name":"Institute of Natural Sciences, Syktyvkar State University, Oktyabrsky Prospect, 55, 167001 Syktyvkar, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1380-7458","authenticated-orcid":false,"given":"Maria G.","family":"Krzhizhanovskaya","sequence":"additional","affiliation":[{"name":"Institute of Earth Sciences, Saint Petersburg State University, University Emb. 7\/9, 199034 St. Petersburg, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6749-738X","authenticated-orcid":false,"given":"Sergey V.","family":"Nekipelov","sequence":"additional","affiliation":[{"name":"Institute of Physics and Mathematics of the Komi Science Center UB RAS, Oplesnina St. 4, 167982 Syktyvkar, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9916-1514","authenticated-orcid":false,"given":"Viktor N.","family":"Sivkov","sequence":"additional","affiliation":[{"name":"Institute of Physics and Mathematics of the Komi Science Center UB RAS, Oplesnina St. 4, 167982 Syktyvkar, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Danil V.","family":"Sivkov","sequence":"additional","affiliation":[{"name":"Institute of Physics and Mathematics of the Komi Science Center UB RAS, Oplesnina St. 4, 167982 Syktyvkar, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,10,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"529","DOI":"10.1016\/0038-1098(96)00012-9","article-title":"Investigation of the dielectric properties of bismuth pyrochlores","volume":"100","author":"Cann","year":"1996","journal-title":"Solid State Commun."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1473","DOI":"10.1016\/j.ceramint.2008.08.006","article-title":"High temperature dielectric properties of cubic bismuth zinc tantalate","volume":"35","author":"Khaw","year":"2009","journal-title":"Ceram. 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