J. Maniks

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Depth profiles of indentation hardness and dislocation mobility in MgO single crystals irradiated with swift 84Kr and 14N ions

by Michael Sorokin and J. Maniks

Applied Physics A, 2015

ABSTRACT The depth dependence of damage and modification of micromechanical properties in MgO sin... more ABSTRACT The depth dependence of damage and modification of micromechanical properties in MgO single crystals irradiated with 150 MeV 84Kr and 24.5 MeV 14N ions (specific energy 1.75 MeV/u) at fluences up to 1015 ions/cm2 has been studied. The effects of ion-induced increase in hardness and reduction in dislocation mobility, magnitude of which varies along the ion range, were observed. These effects are related to ion-induced dislocations which were revealed by chemical etching. The results confirm a joint contribution of electronic excitations and atomic displacements by elastic collisions in the structural damage of MgO. The excitation mechanism in hardening dominates in the incoming part of ion range (up to the Bragg’s maximum), while the role of impact mechanism becomes dominant only at the end of ion range.

Effect of ion-induced secondary radiations on the formation of extended defects and radiolysis beyond the range of swift 12C, 50Ti, and 52Cr ions in LiF

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

Mechanical Properties and Deformation Behavior of Materials having Ultra-Fine Microstructures

Composite Structures, 1994

<title>Effect of light exposure on dislocation mobility in fullerite C60 crystals</title>

Optical Organic and Inorganic Materials, 2001

ABSTRACT The illumination-time evolution and the wavelength dependence of the photoinduced change... more ABSTRACT The illumination-time evolution and the wavelength dependence of the photoinduced changes in dislocation mobility on the (111) face of C60 single crystals in air for the wavelength range 150 - 900 nm and power densities 0.2 - 2 mW/cm2 has been investigated. The results show that the light exposure in air leads to the decrease of the dislocation mobility. The magnitude of the effect as a function of the illumination time was investigated and a two-stage relationship was obtained. The ultraviolet light was found to be more effective than the visible light in the photoinduced reduction of dislocation mobility and solubility. In the wavelength range of 150 - 700 nm, the reduction of dislocation mobility under light irradiation linearly increased with increasing the photon energy. The obtained results are discussed in terms of the photoinduced polymerization, which proceeds through different stages including the formation of dimers, polymer chains and cross-linked polymerized structures.

The Choice OP Optimal Microhardness Testing Conditions for Amorphous and Polycrystalline Films

MRS Proceedings, 1991

ABSTRACTThe microhardness of polycrystalline and amorphous coatings on substrates of various hard... more ABSTRACTThe microhardness of polycrystalline and amorphous coatings on substrates of various hardness has been studied in a wide range of loads. The limits for indentation depth providing optimal conditions for microhardness testing have been found. Basing on the results of integral hardness testing of coated samples at comparatively high loads, a method has been proposed for the microhardness and thickness evaluation.

Surface processing of TlBr single crystals used for radiation detectors

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2009

The processing method for obtaining the high-quality surfaces of TlBr single crystals, providing ... more The processing method for obtaining the high-quality surfaces of TlBr single crystals, providing removal of a mechanically destroyed surface layer by chemical etching, is developed. The crystals grown from the melt of purified materials by the Bridgman-Stockbarger method were used for the experiments. The Vickers microhardness as a structure-sensitive technique was used in a study of the crystal quality and properties of the plastically deformed surface layer created by cutting. It was shown that even under highly accurate conditions of cutting, the depth of the work-hardened surface layer with a high density of dislocations, vacancies and other structural defects exceeds 20 mm. The advantages of offered processing are demonstrated by the spectrometric properties of the TlBr detectors

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