Open AccessМеханическое упрочнение наноструктурированных кристаллов Ba-=SUB=-0.9-=/SUB=-R-=SUB=-0.1-=/SUB=-F-=SUB=-2.1-=/SUB=- (R --- редкоземельные элементы): размерный эффект
Author(s) -
Н.И. Сорокин
Publication year - 2021
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2021.02.50486.150
Subject(s) - indentation hardness , fluorite , stoichiometry , materials science , crystallography , cluster (spacecraft) , block (permutation group theory) , solid solution , mineralogy , chemistry , metallurgy , microstructure , combinatorics , mathematics , computer science , programming language
The effect of strong deviations from stoichiometry in the structural type of fluorite (CaF2) on the microhardness of Ba0.9R0.1F2.1 crystals (R is the rare earth elements La-Lu) has been studied. Mechanical hardening of heterovalent Ba0.9R0.1F2.1 solid solutions in comparison with the BaF2 matrix is due to the formation of nanosized clusters of point defects [Ba8R6F69], replacing structural fragments [Ba14F64] (block type of isomorphism). It was found that, with a decrease in the cluster size from [Ba8La6F69] to [Ba8Lu6F69], the microhardness of nanostructured Ba0.9R0.1F2.1 crystals increases by 73%.