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1
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Defect entropies and enthalpies in BaF2

100%
Katsika-Tsigourakou V., Skordas E.
Open Physics
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2010
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vol. 8
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issue 6
900-904
EN
Various experimental techniques have revealed that the predominant intrinsic point defects in BaF2 are anion Frenkel defects. Their formation, enthalpy and entropy, as well as the corresponding parameters for the fluorine vacancy and fluorine interstitial motion have been determined. In addition, low temperature dielectric relaxation measurements in BaF2doped with uranium leads to the parameters τ0, E in the Arrhenius relation τ = τ0 exp(E/k B T) for the relaxation time τ. For the relaxation peak associated with a single tetravalent uranium, the migration entropy deduced from the pre-exponential factor τ0 is smaller than the anion Frenkel defect formation entropy by almost two orders of magnitude. We show that, despite their great variation, the defect entropies and enthalpies are interconnected through a model based on anharmonic properties of the bulk material which have been recently studied by employing density-functional theory and density-functional perturbation theory.
2
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Dielectric properties of Ba3Sr2DyTi3V7O30 ceramics

80%
Sahoo P., Panigrahi A., Patri S., Choudhary R.
Open Physics
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2010
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vol. 8
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issue 4
639-642
EN
A polycrystalline sample, Ba3Sr2DyTi3V7O30, with tungsten bronze structure was prepared by a mixed-oxide method at high temperature (950°C). Preliminary structural analysis of the compound showed an orthorhombic crystal structure at room temperature. Surface morphology of the compound was studied by scanning electron microscopy. The dielectric anomaly at 321°C may be attributed to the ferro-paraelectric phase transitions. This was also confirmed from the appearance of a hysteresis loop. The nature of variation of the ac conductivity and value of activation energy at different temperature regions, suggest that the conduction process is of mixed-type (i.e., ionic-polaronic and space charge generated from the oxygen ion vacancies).
3
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Significant Increment of the Dielectric Permittivity and Domain Properties in the (1-x)PbTiO3-x(Na0.5Bi0.5)TiO3 Crystals

70%
Czaja P., Piasecki M., Zapart M. B., Suchanicz J., Konieczny K., Michniowski J., Sitko D., Stachowski G., Kluczewska-Chmielarz K., Czaja P., Piasecki M., Zapart M. B., Suchanicz J., Konieczny K., Michniowski J., Sitko D., Stachowski G., Kluczewska-Chmielarz K.
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vol. 65
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issue 1
4
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The application of the Mechanochemical Synthesis for the Preparation of Advanced Ceramics Based on Barium Titanate

70%
Garbarz-Glos B., Bąk W., Budziak A., Dulian P., Lisińka-Czekaj A., Czekaj D., Garbarz-Glos B., Bąk W., Budziak A., Dulian P., Lisińka-Czekaj A., Czekaj D.
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5
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Correlation Between Structure, Microstructure and Dielectric Properties of Bi7Fe3Ti3O21 Ceramics Obtained in Different Conditions

70%
Szalbot D., Bartkowska J. A., Feliksik K., Bara M., Chrunik M., Adamczyk-Habrajska M., Szalbot D., Bartkowska J. A., Feliksik K., Bara M., Chrunik M., Adamczyk-Habrajska M.
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6
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Properties of Pb1–xBax(Zr1–yTiy)1–zSnzO3 (x = 0.03, y = 0.02, z = 0÷0.08) Ceramics

70%
Brzezińska D., Brzezińska D.
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7
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The Analysis of the Thermal and Dielectric Properties of High Voltage Insulating Materials with the Addition of Aluminium Oxide

61%
Tomášková T., Trnka P., Gutten M., Korenčiak D.
Archives of Metallurgy and Materials
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2018
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vol. 63
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issue 2
8
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Effect of Sb and MnO2-Doping on Phase Transitions, Crystal Structure, Thermal, Dielectric, Ferroelectric and Piezoelectric Properties of Na0.5K0.5NbO3 Ceramics

61%
Suchanicz J., Faszczowy I., Czaja P., Kusz J., Zubko M.
Archives of Metallurgy and Materials
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2018
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vol. 63
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issue 2
9
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The Effect of Ho Doping Contents on the Structural, Microstructure and Dielectric Properties of Bi5Ti3FeO15 Aurivillius Ceramics

61%
Tomaszewska M., Dzik J., Wodecka-Duś B., Pikula T., Adamczyk-Habrajska M., Szalbot D., Chocyk D., Tomaszewska M., Dzik J., Wodecka-Duś B., Pikula T., Adamczyk-Habrajska M., Szalbot D., Chocyk D.
Archives of Metallurgy and Materials
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2021
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vol. 66
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issue 1
10
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Dielectric properties and specific conductivity of armenian natural clinoptilolite irradiated by electrons

61%
Yeritsyan H., Sahakyan A., Nikoghosyan S., Harutiunian V., Gevorkyan V., Grigoryan N., Hakhverdyan E., Keheyan Y., Gevorgyan R., Sargisyan H.
Open Physics
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2005
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vol. 3
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issue 4
610-622
EN
The results of dielectric properties and direct current specific electric conductivity measurements in Armenian natural clinoptilolite samples are presented. Electron irradiation with energy 8 MeV and thermal treatment of samples are performed to elucidate possible enhancement mechanisms of clinoptilolite parameters. The results are discussed on the basis of new point structural defects formation and recombination of initial ones in samples. It was shown that the irradiation dose of 3·1016 el/cm2 is critical for natural zeolite structural change, which is manifested by significant changes in dielectric properties and other characteristics. The samples subjected to high temperature heating after electron irradiation, in comparison with an unquenched one, have a significantly higher (about an order of magnitude) value of specific conductivity.
11
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Alternative, Direct Synthesis Method of the Ceramic Solid Solutions Based on BaTiO3 Through a High Energy Ball Milling

61%
Bąk W., Dulian P., Garbarz-Glos B., Czekaj D., Lisińska-Czekaj A., Bąk W., Dulian P., Garbarz-Glos B., Czekaj D., Lisińska-Czekaj A.
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12
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Synthesis and Dielectric Properties of Nd Doped Bi5Ti3FeO15 Ceramics

61%
Kocoń N., Dzik J., Szalbot D., Pikula T., Adamczyk-Habrajska M., Wodecka-Duś B., Kocoń N., Dzik J., Szalbot D., Pikula T., Adamczyk-Habrajska M., Wodecka-Duś B.
Archives of Metallurgy and Materials
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2021
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vol. 66
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issue 2
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