N. L. Sizova

Growth and some properties of TeO2 single crystals with a large diameter

Large-diameter single crystals of TeO2 are grown by the Czochralski method in specially designed setups with automatic monitoring of the crystal growth. The degree of perfection of the grown crystals is examined using selective etching and X-ray topography (the Shultz method). The temperature dependence of the microhardness of TeO2 single crystals is investigated for different crystallographic planes, namely, (001), (100), and (110).

Anisotropy of microhardness and fracture of (NH4)2Ni(SO4)2 · 6H2O (ANSH) crystals

The Vickers hardness of the (010) and (001) planes in (NH4)2Ni(SO4)2 · 6H2O (ANSH) crystals has been measured. Anisotropy hardness of the first kind is revealed for the (010) plane in ANSH. The hardness anisotropy coefficient k2 was determined to be 1.5. The temperature dependence of the microhardness of the (001) face of ANSH crystals was investigated in the temperature range from 20 to 80°C. The character of fracture of the (100), (010), and (001) planes during indentation with a spherical indenter has been qualitatively determined.

Zinc oxide single crystals: Influence of temperature and orientation of crystals on their mechanical properties

AbstractZinc oxide single crystals are grown hydrothermally and their microhardness is measured on different {hkil} faces in the temperature range from liquid nitrogen temperature to 900°C. The coefficient K1C of fracture roughness and the surface energy γ of fracture are estimated. The (0001) plane of a positive monohedron is characterized by the maximum hardness and plasticity over the whole temperature range studied. The shape of indenter prints and dislocation rosettes on the planes of monohedra, hexagonal prisms, and the pyramid are studied. The indenter print on the basal plane has an isotropic shape, whereas on the planes of prisms and the pyramid the prints indicate the first-kind anisotropy of mechanical properties. The first-kind anisotropy coefficient k equal to Hmax/Hmin increases with an increase in the temperature for the

Vickers microhardness of K2Co(SO4)2 · 6H2O single crystals and fracture geometry around impressions of vickers, knoop, and spherical indenters

\{ 10\bar 10\} , \{ 11\bar 20\}

Peculiarities of the Structure, Moduli of Elasticity, and Knoop Indentation Patterns of Deformation and Fracture of Single Crystals of Potassium, Rubidium, Cesium, and Ammonium Hydrophthalates

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Effect of orientation on kinking in single-crystal potassium hydrophthalate deformed in compression

\{ 10\bar 11\}