Analysis of phase changes during synthesis of Sr2Fe1.2Mo0.8O6-δ solid solution by the solid-phase reaction method
Phase transformations during crystallization of the magnetic metal-oxide compound Sr2Fe1.2Mo0.8O6-δ by the solid-phase reactions method from a mixture of simple reagents 2SrCO3 + 0.6Fe2O3 + 0.8MoO3 have been analyzed. By means of differential-thermal and thermogravimetric analyses it was found that...
Saved in:
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Pensoft Publishers
2025-04-01
|
| Series: | Modern Electronic Materials |
| Online Access: | https://moem.pensoft.net/article/140603/download/pdf/ |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Phase transformations during crystallization of the magnetic metal-oxide compound Sr2Fe1.2Mo0.8O6-δ by the solid-phase reactions method from a mixture of simple reagents 2SrCO3 + 0.6Fe2O3 + 0.8MoO3 have been analyzed. By means of differential-thermal and thermogravimetric analyses it was found that the synthesis of strontium ferromolybdate of the Sr2Fe1.2Mo0.8O6-δ composition proceeds through a series of successive-parallel stages. In this way, when considering the dynamics of phase transformations, it has been found that the main accompanying compounds during the crystallization of the solid solution of double perovskite Sr2Fe1.2Mo0.8O6-δ are Fe2O3, SrCO3, SrMoO4 and SrFeO3. When analyzing the phase composition of the batch consisting of a mixture of initial reagents of stoichiometric composition: 2SrCO3 + 0.6Fe2O3 + 0.8MoO3, it was noted that with an increase in temperature, complex compounds SrMoO4, SrFeO3, and then Sr2Fe1.2Mo0.8O6-δ as well, appear almost simultaneously. This circumstance indicates that the compounds SrMoO4 and SrFeO3 are the structure-forming ones for the solid solution of ferromolybdate – strontium. With a subsequent increase in temperature to 1470 K, it was found that the dissolution of SrFeO3 with the formation of double perovskite Sr2Fe1.2Mo0.8O6-δ occurs faster than the dissolution of strontium molybdate SrMoO4. The results of the analysis indicate the difficult nature of the dynamics of solid-phase reactions during the formation of Sr2Fe1.2Mo0.8O6-δ. |
|---|---|
| ISSN: | 2452-1779 |