Mechanical Hardening of Nanostructured Ba0.9R0.1F2.1 (R = Rare-Earth Elements) Crystals: Size Effect

The effect of strong stoichiometry violations in the structural type of fluorite (CaF 2 ) on the microhardness of Ba 0.9 R 0.1 F 2.1 (R = rare-earth elements La–Lu) crystals is studied. The mechanical hardening of heterovalent solid solutions Ba 0.9 R 0.1 F 2.1 as compared to the BaF 2 matrix is due...

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Bibliographic Details
Published in:Physics of the solid state 2021-02, Vol.63 (2), p.291-294
Main Author: Sorokin, N. I.
Format: Article
Language:English
Subjects:
Barium fluorides
Crystal defects
Crystal structure
Fluorite
Hardening
Isomorphism
Mechanical Properties
Microhardness
Nanostructure
Physics
Physics and Astronomy
Physics of Strength
Plasticity
Point defects
Rare earth elements
Size effects
Solid solutions
Solid State Physics
Stoichiometry
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Summary:The effect of strong stoichiometry violations in the structural type of fluorite (CaF 2 ) on the microhardness of Ba 0.9 R 0.1 F 2.1 (R = rare-earth elements La–Lu) crystals is studied. The mechanical hardening of heterovalent solid solutions Ba 0.9 R 0.1 F 2.1 as compared to the BaF 2 matrix is due to the formation of nanosized clusters of point defects [Ba 8 R 6 F 69 ] substituting structural fragments [Ba 14 F 64 ] (block-type isomorphism). The microhardness of nanostructured Ba 0.9 R 0.1 F 2.1 crystals is found to increase by 73% as the cluster size decreases from [Ba 8 La 6 F 69 ] to [Ba 8 Lu 6 F 69 ].
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783421020244