Synthesis and thermal expansion of SrREE4(SiO4)3O apatites

Synthesis and thermal expansion of SrREE4(SiO4)3O apatites

This article presents the results of the optimization of solid-phase synthesis of oxysilicates of the composition SrREE 4 (SiO 4 ) 3 O (REE: La–Lu, except Ce, Pm, Tm, Yb) having the structure of apatite. The new synthesis technique allows for reducing the temperature of the final stage and avoiding...

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Veröffentlicht in:Bulletin of materials science 2023-12, Vol.46 (4), p.229, Article 229
Hauptverfasser: Bulanov, Evgeny N, Golitsyna, Oxana N, Shvareva, Alyona G, Korokin, Vitalij Zh, Knyazev, Alexander V
Format: Artikel
Sprache:eng
Schlagworte:
Apatite
Chemistry and Materials Science
Crystal structure
Decomposition
Dielectric properties
Engineering
Materials Science
Nitrates
Optical properties
Phase transitions
Quartz
Radiation
Reagents
Silica
Silicon
Solid phase synthesis
Temperature
Thermal expansion
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Zusammenfassung:This article presents the results of the optimization of solid-phase synthesis of oxysilicates of the composition SrREE 4 (SiO 4 ) 3 O (REE: La–Lu, except Ce, Pm, Tm, Yb) having the structure of apatite. The new synthesis technique allows for reducing the temperature of the final stage and avoiding impurities of REEO(OH) and REE 2 O 2 CO 3 in the final product. The crystal structure of SrEu 4 (SiO 4 ) 3 O ( a = 9.50029(37) Å, c = 7.02540(31) Å, V = 549.130(49) Å 3 , R -Bragg = 2.721%) was refined for the first time. This is a study of the thermal expansion of compounds in the temperature range of 173–373 K. The effect of the internal periodicity of changes in the linear and volumetric coefficients of thermal expansion in a number of studied compounds was revealed.
ISSN:0973-7669
0250-4707
0973-7669
DOI:10.1007/s12034-023-03067-2