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Article
On the role of twinning in solid-state reactions
A new concept of the role of twinning in processes of plastic deformation is proposed which suggests mechanical twinning to be the main mechanism of solid-state reactions under the deformation mixing of compon...
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Article
Energy estimates of twinning processes in cubic single crystals
The role of twinning processes giving rise to the fragmentation and rotation of a structure caused by single-crystal deformation, as well as the joining of grains during the manufacturing of optical ceramics, ...
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Article
Laser ceramics: Mechanisms of solid-state reactions
The role of twinning in synthesizing Y3Al5O12 from Al2O3 and Y2O3 powders during milling and compacting is shown by the example of obtaining laser ceramics based on yttrium-aluminum garnet. Simulation of twins in...
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Article
Lutetium-aluminum garnet laser ceramics
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Article
Nanostructure of optical fluoride ceramics
The real structure of samples of optical fluoride ceramics is studied by atomic force, scanning electron, and transmission electron microscopy. It is shown that the optical ceramic samples based on CaF2 have a la...
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Article
New oxide ceramics {YGd2}[Sc2](Al2Ga)O12 with a partially disordered “garnet” structure as a matrix for the Ln3+ laser activator ions: Some physical properties
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Article
Mechanical twinning of yttrium oxide single crystals
The deformation structure of an yttrium oxide single crystal under point load was studied by microhardness and electron microscopy. It was concluded that mechanical twinning is the main mechanism of plastic de...
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Article
Role of twinning in plastic deformation
A new concept of the structure of yttrium-aluminum garnet (Y3Al5O12) has demonstrated the possibility of forming inversion twins in the (111) plane. The twinning processes are shown to be responsible for stress r...
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Article
A study of the structure and scattering mechanisms of subterahertz phonons in lithium fluoride single crystals and optical ceramics
The methods of optical, electron, and atomic force microscopy (AFM) are applied to the study of the real structure of optical lithium fluoride ceramic obtained by hot deformation of single crystals. A comparat...
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Article
Twinning as a possible mechanism of stress relaxation accompanying the formation of refractory crystalline oxides: Polycrystalline ceramics and single crystals
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Article
Effect of twinning on the structure of optical ceramics
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Article
Kinetic characteristics of subterahertz phonons in optically transparent Y3Al5O12 ceramics with twinning elements in their structure
The relationship between the kinetic characteristics of subterahertz thermal phonons and the structural features of grains and grain boundaries in optically transparent yttrium aluminum garnet (YAG) ceramics i...
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Article
Physicomechanical properties of cryptocrystalline fluorite from the Suran deposit, southern Urals
Microhardness (H) and fracture toughness (K 1C) have been studied for the main varieties of shock-resistant cryptocrystalline fluorite, a natural ceramic widespread at the Suran deposit. S...
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Article
Structure, properties, and formation models of optical ceramics
The structure, properties, and formation mechanisms of Y3Al5O12, Y2O3, and Lu2O3 laser ceramics are investigated. Their microhardness and fracture toughness are determined. It is shown that the change in mechanic...
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Article
Model of pore healing in the process of producing optical ceramics
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Article
A crowdion mechanism of crystal twinning
The processes of plastic deformation of crystals via mechanical twinning are considered. Models of nucleation and motion of twin boundaries leading to formation of twin interlayers are proposed. These models a...
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Article
Anomalously high fracture toughness of polycrystalline optical fluorite from the suran deposit (South Urals)
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Article
Microhardness and fracture toughness of Y2O3-and Y3Al5O12-based nanocrystalline laser ceramics
The microhardness and fracture toughness of laser nanocrystalline ceramics based on the cubic oxides Y2O3 and Y3Al5O12 are determined experimentally. It is shown by comparative measurements that the fracture toug...
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Article
New data on the physical properties of Y3Al5O12-based nanocrystalline laser ceramics
Microhardness and fracture toughness of highly transparent Y3Al5O12-and Y3Al5O12: Nd3+-based nanocrystalline ceramics are measured for the first time. For the Y3Al5O12: Nd3+ laser ceramics, the use of a longitudi...
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Article
Formation of the nanocrystalline state by twinning crystals
The formation of the nanocrystalline state under the action of a concentrated load applied to crystals is studied. It is established that the relaxation of the enormous stresses (on the order of the shear modu...
