Strength and texture of sodium chloride to 56 GPa

Abstract

The strength and texture of sodium chloride in the B1 (rocksalt) and B2 (cesium chloride) phases were investigated in a diamond anvil cell using synchrotron X-ray diffraction in a radial geometry to 56 GPa. The measured differential stresses within the Reuss limit are in the range of 0.2 GPa for the B1 phase at pressure of 24 GPa and 1.6 GPa for the B2 phase at pressure of 56 GPa. A strength weakening is observed near the B1-B2 phase transition at about 30 GPa. The low strength of NaCl in the B1 phase confirms that it is an effective pressure-transmitting medium for high-pressure experiments to ∼30 GPa. The B2 phase can be also used as a pressure-transmitting medium although it exhibits a steeper increase in strength with pressure than the B1 phase. Deformation induces weak lattice preferred orientation in NaCl, showing a (100) texture in the B1 phase and a (110) texture in the B2 phase. The observed textures were evaluated by viscoplastic self-consistent model and our results suggest {110}⟨11¯0⟩ as the slip system for the B1 phase and {112}⟨11¯0⟩ for the B2 phase.

Strength and seismic anisotropy of textured FeSi at planetary core conditions

“…Analysis of texture evolution of B20 ε-FeSi shows strong intensities on (Calnan, 1954;Kestens and Pirgazi, 2016;El-Tahawy et al, 2020). In cubic materials with the B1-structure, e.g., in MgO and low-pressure phase of NaCl, compression textures develop along [100] direction as a result of {110}[110] slip (Kern and Braun, 1973;Mi et al, 2018). Materials with the B2 structure tend to develop either [110] texture due to {112}[110] slip as in the high-pressure phase of NaCl (Mi et al, 2018) or a maximum along [111] with the most active slip system {011} [100] as in the intermetallic NiAl (Khadkikar et al, 1990;Margevicius and Cotton, 1995).…”

Development of slurry targets for high repetition-rate XFEL experiments

“…NaCl is an ionic solid of significant interest for highpressure science, geoscience, and dynamic compression. It is widely used as a pressure standard and insulating material in diamond anvil cell experiments and there has been much effort devoted to studying it's strength (39,40,64), equation of state (3,9,17,21,22) and phase transitions (1, 6, 23, 34-36, 49, 54). At room temperature NaCl undergoes a transition from the B1 rocksalt structure (space group = Fm 3m) to the B2 cesium chloride structure (space group = Pm 3m) at about 25 GPa.…”

“…(20,36). Also shown are Hugoniot data for epoxy (black cross with fits) (38,44), and slurry sample with vol% epoxy(60):sample (40) for each material (crossed circles) (36). We observe that, for each material, the calculated slurry Hugoniot based on Eqn.…”

Texture Development and Stress–Strain Partitioning in Periclase + Halite Aggregates

“…However, measurements of differential stress from different studies show inconsistencies. Previous studies on NaCl polycrystals report different differential stresses in a wide pressure range (Figure 14) [51][52][53][54][55][56][57]. Much of this inconsistency comes from different assumptions of mechanical behavior of polycrystals (iso-stress, iso-strain, etc.…”