Effect of Fe-Doping on Thermal Expansion and Stability of Bismuth Magnesium Tantalate Pyrochlorere.

ABSTRACT: A continuous series of solid solutions (Bi_1.5Mg_0.75-xFe_xTa_1.5O_7±Δ (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 a 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^-6 °C^-1 in the temperature range 30-1100 °C. The effect of iron(III) ions on the thermal stability and th

SUBMITTER: Zhuk NA 

PROVIDER: S-EPMC9657759 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature