Mechanical characteristics of the NaCl: Eu²⁺ crystal system

Abstract

Mechanical Characteristics of the NaCl : Eu2 + Crystal System Yield strength of NaC1: EuZ+ monocrystals was studied as function of both the dopant concentration and the annealing parameters. Main attention was paid to the strengthening mechanisms induced by the presence of europium related second phases the structure of which was controlled by means of optical methods.Depending on the nature of the second phases and their crystallographic relations with the matrix, two strengthening phenomena have been evidenced: this related with the presence of penetrable and that related with inprenetrable second phase particles. As far as the former ones can be sheared along with the matrix, the laterare overcomed due to a looping mechanism resembling the behaviour of metal alloys with the fcctype of structure.

Study on Influence of a State of Dopants on Dislocation-Dopant Ions Interaction in Annealed Crystals

“…A large number of investigations on strength of materials have been made with alkali halide crystals so far [1][2][3][4]. This will be because the crystals have some advantages [5]: A small number of glide systems on account of rock salt structure, low dislocation density in grown crystal (e.g., 10 4 cm À2 order for NaCl [6] and KCl [7] single crystals) as against that of annealed metals (around 10 7 cm À2 [8], e.g., 1 to 5 Â 10 6 cm À2 in pure Cu single crystals [9], 1 to 5 Â 10 6 cm À2 in α-brass single crystals [10], and 10 7 cm À2 order for pure Fe single crystals [11]), transparency, and further readily available single crystal, etc.…”

Interaction between a dislocation and monovalent anion in various alkali halide crystals

“…The applicability of it is examined on the basis of (L 0 /L) 2 versus the bending angle of dislocation by the anion in each crystal. A large number of investigations on strength of materials have been made with alkali halide crystals so far [8][9][10][11]. This will be because the crystals have some advantages [12]: (1) simple crystal structure (i.e., rock salt structure), (2) low dislocation density in grown crystal (e.g., 10…”