Electron Optical Investigation of Growth‐Induced Inhomogeneities of Synthetic Hg<sub>2</sub>Cl<sub>2</sub> Monocrystals

Ramlau, R.; Reiche, M.; Heydenreich, J.

doi:10.1002/crat.2170170405

Cited by 1 publication

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“…A similar subgrain structure that we will refer to as the "cellular" structure has also been revealed by etching and observed by SEM in HgzC12 crystals and is related to local deviations from the stoichiometric composition (mercury vacancies) [197][198][199]. The formation of cellular structures as a result of accumulation of electrically charged vacancies, interstitials and/or impurities in boundaries has also been observed in LiF, AgCI, NaC1 [200,201], AgBr [202], A1 [187,203,204] and ZnO crystals [205].…”

Section: Mosaicitymentioning

confidence: 95%

Extended structural defects in ?-Hgl2 single crystals

Nicolau

Dupuy

Rolland

1993

J Mater Sci: Mater Electron

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Extended structural defects in both ~-Hgl 2 crystals grown in solution or from the vapourphase were studied by optical microscopy, light scattering, SEM operated in cathodoluminescence and in secondary electron mode, X-ray topography, neutron, y-and X-ray rocking curves and oscillating crystal X-ray diffraction. The observed dislocations were compared with theoretically calculated dislocations. Dislocation loops, having diameters ranging from 2 gm to 500 gm, are observed on all low index faces, Hohlstellen (lens-shaped voids) having axes along the [001] direction, less than 1 gm in thickness, and diameters lying in the (001) planes, ranging from 2 gm to 10 gm are characteristic defects. Observed plastic deformations like glide sheets and bands, tilt and twist boundaries, kink and fatigue bands, ridges and rumplings were characterized. Growth rings, spherical void inclusions 10-30 gm in diameter, orthogonal walls of forest screw dislocations parallel to {1 00} planes, and streaks (planar void sheets crossing the (001 ) planes) were only observed in crystals grown from the vapour-phase. Cross-penetration twins having {1 1 4} twin planes are described. The possible formation of stacking faults was analysed. The mosaicity of solution-grown crystals ranges from 1' to 6'. A characteristic cellular structure, having a cell size ranging from 2 I~m to 10 gm, was observed in all the crystals examined and correlated to local deviations from the stoichiometric composition. Solid lens-shaped inclusions, having diameters ranging from 3 gm to 500 gm and thicknesses ranging from 0.3 gm to 50 gm, respectively, are entrapped in many crystals and correlated to spiral hillocks observed on {0 01 } growing faces.

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