scholarly journals Comprehensive study of changes in the optical, structural and strength properties of ZrO2 ceramics as a result of phase transformations caused by irradiation with heavy ions

2021 ◽  
Author(s):  
M. Alin ◽  
A. L. Kozlovskiy ◽  
M. V. Zdorovets ◽  
V. V. Uglov
Keyword(s):  
Phase Transformations ◽  
Heavy Ions ◽  
Strength Properties ◽  
Comprehensive Study

Phase transformations induced by swift heavy ions in the new high Tc copper oxides

1989 ◽  
Vol 110 (1-2) ◽  
pp. 211-213 ◽  
Author(s):  
D. Bourgault ◽  
D. Groult ◽  
S. Bouffard ◽  
M. Hervieu ◽  
J. Provost ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Heavy Ions ◽  
Copper Oxides ◽  
High Tc ◽  
Swift Heavy Ions

scholarly journals Destruction phenomena in ferroactive materials

2020 ◽  
Vol 10 (04) ◽  
pp. 2050012
Author(s):  
Sidek Khasbulatov ◽  
Aleksander Cherpakov ◽  
Ivan Parinov ◽  
Konstantin Andryushin ◽  
Lidiya Shilkina ◽  
...  
Keyword(s):  
Solid Phase ◽  
Bismuth Ferrite ◽  
Structural Features ◽  
Strength Properties ◽  
Ceramic Technology ◽  
Grain Structure ◽  
Structural Elements ◽  
Phase Synthesis ◽  
Local Stresses ◽  
Comprehensive Study

The results of a comprehensive study of the crystal structure, grain structure, and strength properties of ceramic bismuth ferrite with rare earth elements (REE) obtained by two-stage solid-phase synthesis followed by sintering using conventional ceramic technology are presented. The reasons for the formation of low mechanical strength and the development of destruction phenomena in solid solutions with small REE ([Formula: see text] Å) are considered: Tb, Dy, Ho, Er, Tm, Yb, Lu. The causes of the observed phenomena associated with the composite-like structure of the studied media and, as a consequence, the occurrence of local stresses of structural elements that provoke crack formation are established. A source of the latter are also the structural features of the grain landscape. The conclusion is made about the appropriateness of taking into account the information obtained when developing devices based on BiFeO3/REE multiferroics.

scholarly journals Study of change in beryllium oxide strength properties as a result of irradiation with heavy ions

2021 ◽  
Vol 5 (3) ◽  
pp. 192-199
Author(s):  
M.V. Zdorovets ◽  
A.L. Kozlovskiy ◽  
D.B. Borgekov ◽  
D.I. Shlimas
Keyword(s):  
Heavy Ions ◽  
Mechanical Characteristics ◽  
Bending Strength ◽  
Sharp Decrease ◽  
Beryllium Oxide ◽  
Strength Properties ◽  
Strength Characteristics ◽  
Radiation Doses ◽  
Near Surface ◽  
Ion Energy

The paper presents data on changes in strength properties, including data on microhardness, crack resistance, bending strength and wear of BeO ceramics as a result of irradiation with heavy accelerated ions. The following types of ions were selected as heavy ions: O2+ (28 MeV), Ar8+ (70 MeV), Kr15+ (147 MeV), Xe22+ (230 MeV). Radiation doses were 1013 -1015 ion/cm2 , which make it possible to assess the effect of both single defects arising from radiation, and cluster overlapping defective areas occurring at large radiation doses. During the studies carried out, it was found that an increase in the ion energy and, consequently, in the damaging ability and depth of the damaged area, leads to a sharp decrease in the strength mechanical characteristics of ceramics, which is due to an increase in defective areas in the material of the near-surface damaged layer. However, an increase in irradiation dose for all types of exposure results in an almost equilibrium decrease in strength characteristics and the same trend of change in strength characteristics. The obtained dependencies indicate that the proposed mechanisms responsible for changing the strength properties can, under certain assumptions, be extrapolated to various types of exposure to heavy ions in the energy range (25-250 MeV).

scholarly journals Phase Transformations in Pyrochlores Irradiated with Swift Heavy Ions: Influence of Composition and Chemical Bonding

2013 ◽  
Vol 123 (5) ◽  
pp. 862-866 ◽  
Author(s):  
G. Sattonnay ◽  
L. Thomé ◽  
N. Sellami ◽  
I. Monnet ◽  
C. Grygiel ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Chemical Bonding ◽  
Heavy Ions ◽  
Swift Heavy Ions

scholarly journals Research into the effect of the 3D-printing mode on changing the properties of PETG transparent plastic

2021 ◽  
Author(s):  
Pavel Petrov ◽  
Diana Agzamova ◽  
Vladimir Pustovalov ◽  
Elena Zhikhareva ◽  
Boris Saprykin ◽  
...  
Keyword(s):  
Optical Properties ◽  
3D Printing ◽  
Strength Properties ◽  
Post Treatment ◽  
Optical Transparency ◽  
Technological Parameters ◽  
Fused Filament Fabrication ◽  
Transparent Plastic ◽  
Increased Strength ◽  
Comprehensive Study

A study of mechanical and optical properties of samples of transparent plastic Polyethylene terephthalate glycol (PETG) manufactured by additive technology Fused Filament Fabrication (FFF) was carried out. PETG plastic is used in medicine, particularly in dentistry due to its unique set of properties: strength, elasticity, resistance to aggressive environments, transparency. Preserving the complex of properties of PETG plastic, including transparency, during 3D-printing is an important technical task. In order to solve this task a set of studies of PETG laboratory samples was carried out. The optimum modes of 3D printing were determined to provide PETG samples with increased strength properties, preservation of elastic properties and optical transparency of the material. The increase in the optical transparency of the material is provided by an additional post-treatment of the printed samples surface with a chemical reagent. The influence of technological parameters of the post- treatment mode on the mechanical and optical properties of the printed samples has been investigated. The novelty of the work consists in a comprehensive study of the modes of manufacturing products from PETG by technology FFF with subsequent post-treatment, allowing to preserve the transparency of the polymeric material.

scholarly journals Phase transformations inLn2O3materials irradiated with swift heavy ions

2015 ◽  
Vol 92 (17) ◽  
Author(s):  
Cameron L. Tracy ◽  
Maik Lang ◽  
Fuxiang Zhang ◽  
Christina Trautmann ◽  
Rodney C. Ewing
Keyword(s):  
Phase Transformations ◽  
Heavy Ions ◽  
Swift Heavy Ions

Progress In The Practical Application Of Automated Image Analysis To Tem Negatives

1977 ◽  
Vol 35 ◽  
pp. 214-217
Author(s):  
F. A. Heckman ◽  
E. Redman ◽  
J.E. Connolly
Keyword(s):  
Image Analysis ◽  
Image Quality ◽  
Exposure Time ◽  
Image Contrast ◽  
Automated Image Analysis ◽  
Practical Application ◽  
Factors Affecting ◽  
High Image Quality ◽  
Qualitative Evidence ◽  
Comprehensive Study

In our initial publication on this subject1) we reported results demonstrating that contrast is the most important factor in producing the high image quality required for reliable image analysis. We also listed the factors which enhance contrast in order of the experimentally determined magnitude of their effect. The two most powerful factors affecting image contrast attainable with sheet film are beam intensity and KV. At that time we had only qualitative evidence for the ranking of enhancing factors. Later we carried out the densitometric measurements which led to the results outlined below.Meaningful evaluations of the cause-effect relationships among the considerable number of variables in preparing EM negatives depend on doing things in a systematic way, varying only one parameter at a time. Unless otherwise noted, we adhered to the following procedure evolved during our comprehensive study:Philips EM-300; 30μ objective aperature; magnification 7000- 12000X, exposure time 1 second, anti-contamination device operating.

Hexachlorobenzene toxicity in the monkey ovary: III. Ultrastructure induced by high (10 mg/kg) dose exposure

1991 ◽  
Vol 49 ◽  
pp. 130-131
Author(s):  
A. Singh ◽  
A. Dykeman ◽  
J. Jarrelf ◽  
D. C. Villeneuve
Keyword(s):  
Present Report ◽  
Reproductive Toxicity ◽  
Control Group ◽  
Primate Model ◽  
Human Follicular Fluid ◽  
Thin Sections ◽  
Cynomolgus Monkeys ◽  
Cacodylate Buffer ◽  
Induction Cycle ◽  
Comprehensive Study

Hexachlorobenzene (HCB), a persistent and mobile organochlorine pesticide, occurs in environment. HCB has been shown to be present in human follicular fluid. An objective of the present report, which is part of a comprehensive study on reproductive toxicity of HCB, was to determine the cytologic effects of the compound on ovarian follicles in a primate model.Materials and Methods. Eight Cynomolgus monkeys were housed under controlled conditions at Animal facility of Health and Welfare, Ottawa. Animals were orally administered gelatin capsules containing HCB mixed with glucose in daily dosages of 0.0 or 10 mg/kg b.w. for 90 days; the former was the control group. On the menstrual period following completion of dosing, the monkeys underwent an induction cycle of superovulation. At necropsy, one-half of an ovary from each animal was diced into ca. 2- to 3-mm cubed specimens that were fixed by immersion in 2.5% glutaraldehyde in 0.1 M cacodylate buffer (pH 7.3). Subsequent procedures followed to obtain thin sections that were examined in a Hitachi H-7000 electron microscope have been described earlier.

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