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1
Phase Equilibria in the Cu2S-{Sb,Bi}2S3-Ga2S3 and Cu2S-{Sb,Bi}2S3-In2S3 Systems at 673 K
100%
Olekseyuk I. , Zhbankov O. , Kumanska Y. , Tkachuk V.
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2006
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tom Vol. 80, nr 5
817-823
EN
Phase equilibria in the Cu2S-{Sb,Bi}2S3-Ga2S3 and Cu2S-{Sb,Bi}2S3-In2S3 systems at 673 K were investigated by X-ray powder diffraction and their isothermal sections were constructed. No quaternary compounds or continuous solid solutions were found. The homogeneity region of the CuIn5S8 phase in quasibinary Cu2S-In2S3 system was determined in the range 7.3-17.2mol.% Cu2S. The Rietveld refinement of the crystal structure CuGa5S8 has been performed, using powder diffraction pattern in the zinc blende model (SG F43m, a = 0.52246(2) nm).
2
Particular Features of Formation of the Anhydrous Solid Solutions of Mg, Mn(II), Co(II) and Zn Diphosphates
100%
Antraptseva N. , Tkachova N. , Ponomaryeva I.
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2006
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tom Vol. 80, nr 10
1623-1631
EN
The sequence of physical and chemical as well as structural transformations accompanying the formation of solid solutions of anhydrous Mg,Mn(II), Co(II) and Zn diphosphates by thermal dehydration of corresponding hydrated salts was investigated. The interconnection between state of water in crystallohydrate, on one side, and mechanism of its removal, on the other side, was considered. The peculiarities controlling the processes of formation of solid solutions of anhydrous divalent metal diphosphateswere established.
3
Phase Equilibrium in the AgInSe2-CdSe System
100%
Mishchenko I.
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2001
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tom Vol. 75, nr 10
1407-1411
EN
Results of phase equilibrium in the AgInSe2-CdSe system by differential thermal, X-ray, microstructural analyses and measurements of microhardness are given. The system is quasibinary with limited solubility of the components in the solid state. The region of solid solution on the base of AgInSe2 is 4 mol.% CdSe (820 K). The ranges of solid solutions on the base of CdSe are much larger (up to 40 mol.% AgInSe2 at 820 K). Coordinates of eutectic point are 10 mol.% CdSe, 1023 K. The alloy AgCd2InSe4 is located in the solid solution ranges based on CdSe.
4
Interaction in the AgInSe2-Ag8GeSe6(Ag8SnSe6) systems
100%
Olekseyuk I. , Krykhovets O.
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1999
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tom vol. 73 nr 2
287-291
5
Content available remote Dielectric properties of polycrystalline (Ba0.40Sr0.60)O3
100%
Kajtoch C. , Bąk W. , Gabryś M. , Mroczka K. , Starzyk F. , Żmija J.
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2009
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tom Vol. 40, nr 1
33-36
EN
Purpose: Purpose of this paper is to qualify of the degree and the causes of broadening of the phase transition in the polycrystalline solid solution (Ba0.40Sr0.60)TiO3 (BS60T). Design/methodology/approach: Polycrystalline samples of (Ba0.40Sr0.60)TiO3 (BS60T) were prepared by calcinations method at temperature 1570K. Images of the morphology of the samples were taken by means of electron microscope Philips SEM 525M at room temperature. Dielectric measurements were performed with application of Quatro Cryosystem 4.0 Agilent Precision LRC meter HP4824A equipped with WinDETA 5.62 software Novocontrol. Measurements were taken under cooling with 2K/min speed. Measuring electric field frequency was from the range 20 Hz - 1 MHz. Findings: The dielectrometry was applied to measure complex dielectric permittivity and other dielectric functions of ferroelectric (BS60T). It was affirmed, that 60% substitution of Sr ions changed the type of phase transition. Weak dependence of temperature Tm=208 K (temperature of maximum electric permittivity &epsilon') on frequency of the external electric field testifies about diffused character of the phase transition (DPT). The polar character of this material was also observed in the paraelectric phase (to 360 K). This observation is connected with the occurrence of polar clusters in this phase. Research limitations/implications: Results can be used in order to describe the phase transition modifications in the solid solutions with ferroactive substitutions in sublattice B of the perovskite. Originality/value: Value of this work relies on the experimental examination of the electric properties of BS60T solid solution. The low value of phase angle in the paraelectric phase is connected with the occurrence of the polar regions (clusters).
6
Phase relations in the Cu2Si(Ge,Sn)Te3-HgTe systems
88%
Parasyuk O. V.
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1998
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tom Vol. 72, nr 11
2440-2449
EN
The Cu2Si(Ge,Sn)Te3-HgTe systems were investigated using differential thermal, X-ray phase and microstructural analysis. Existence of the quaternary Cu2HgSiTe4 and Cu2HgGeTe4 phases, which melt congruently at 898 and 805 K respectively, have been established in Cu2SiTe3-HgTe and Cu2GeTe3-HgTe systems. The Cu2HgSnTe4 phase is a part of solid solution on the basis of Cu2SnTe3 in Cu2SnTe3-HgTe section. The solid solution on the basis of Cu2SiTe3 contains 7 mol% HgTe and the one on the basis of Cu2GeTe3 contains 12 mol% HgTe. The solid solubility in HgTe at 670 K is 2.5 mol% Cu2SiTe3, 4 mol% Cu2GeTe3, and 5.5 mol% Cu2SnTe3.
7
The phase equilibria on AgGaS2/AgInS2/-HgS section in the quasi-ternary Ag2S-HgS-Ga2S3/In2S3/ systems
88%
Olekseyuk I. , Galka V. , Parasyuk O.
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1999
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tom vol. 73 nr 2
255-261
EN
The phase diagrams of AgGaS2/AgInS2/-HgS sections in the quasi-ternary Ag2S-HgS-Ga2S3/In2S3/ systems have been constructed using differential thermal, X-ray phase and microstructural analyses. AgGaS2-HgS section is quasi-binary and belongs to the eutectic type. The coordinates of the eutectic point are 76 mol% HgS and 1018 K. AgInS2-HgS is not quasi-binary above the solidus. In the AgInS2-HgS system the limited solid solutions within the composition range 0-2 mol% HgS and 82-98 mol% HgS at 670 K were discovered. The compounds AgInS2 and HgS form limited solid solutions within the composition range 0-2 mol% HgS and 71-95 mol% HgS at 670 K. The solid solutions, in the part HgS-rich, are created on the basis of the low temperature cubic structure (a-HgS) on both sections.
8
Phase relations in the CuGaTe2-HgTe and CuInTe2-HgTe systems
88%
Parasyuk O. , Olekseyuk I. , Morenko A. , Gorgut G.
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1999
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tom vol. 73 nr 5
765-771
EN
Phase equilibria in the CuGaTe2-HgTe and CuInTe2-HgTe systems are investigated by differential thermal, X-ray phase and microstructural analyses. Both systems are of quasibinary, peritectic type, resulting in the formation of solid solutions. Solid solubility in HgTe varies from 0-31 mol% for Cu GaTe2 and from 0-64 mol% for CuInTe2. The solid solution based on CuInTe2 does not exceed 4mol% HgTe and the one based on CuGaTe2 contains less than 2 mol% HgTe.
9
Content available Effect of Cooling Rate on the Precipitation Characteristics of Cast Al–Si–Cu Alloy
75%
Okayasu M. , Sahara N. , Touda M. , Okayasu M. , Sahara N. , Touda M.
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nr 3
10
Phase Equilibria in the Ag2Se-In2Se3-GeSe2(SnSe2) system
75%
Olekseyuk I. , Krykhovets O. , Sysa L.
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1999
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tom vol. 73 nr 3
431-436
EN
Phase Equilibria in the Ag2Se-In2Se3-GeSe2(SnSe2) and Ag2Se-In2Se3-GeSe2 systems have been established using X-ray and microstructural analysis. Homogeneity region of the AgInSe2 compound and lattice parameters of solid solutions in both systems have been determined. Four new compounds have been found. X-ray single crystal study has been performed for Ag2In2GeSe6; space group CC, a= 1.2692(3), b= 0.7492(1), c= 1.2644(3) nm, b= 109.50(3)0.
11
Content available remote Silver alloys resistant to darkening
63%
Gryziecki J. , Sobota J. , Włoch G.
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2007
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tom Vol. 52, iss. 1
143-146
EN
The study presents the results of investigation of the resistance to sulfur corrosion and of the mechanical properties of silver alloys without copper, of 925 fineness. As the alloy additions there were used elements which are able to create on the alloy surface an oxide layer as a protection against corrosion and which reduces the SFE of the alloy. The obtained silver alloys without copper, of 925 fineness, are characterized by high resistance to the action of sulfur corrosion and good mechanical properties.
PL
W niniejszej pracy przedstawiono wyniki badań odporności na działanie korozji siarkowej oraz właściwości mechanicznych bezmiedziowych stopów srebra próby 925. Jako dodatki stopowe zastosowano pierwiastki, które mają zdolność do tworzenia na powierzchni stopu warstwy tlenkowej, stanowiącej ochronę przed korozją oraz obniżające EBU stopu. Wytworzone bezmiedziowe stopy srebra próby 925 cechują się bardzo dobrą odpornością na działanie korozji oraz dobrymi właściwościami mechanicznymi.
12
Content available remote Dielectric properties of polycrystalline (Ba0.60Sr).40)Ti0.8O3
63%
Gabryś M.
|
2008
|
tom Vol. 34, nr 1
27-30
EN
Purpose: The purpose of the work was to determinate the influence of the ferroactive Sr substitutions in sublattice A and the nonstoichiometry in sublattice B on changes of physical properties and the character of phase transition (PT) in pure barium titanate BaTiO3 (BT). Design/methodology/approach: The polycrystalline samples of (Ba0.60Sr0.40)TiO3 and (Ba0.60Sr0.40)Ti0.8O3 were obtained by the calcinations method in temperature 1620 K. The dielectric measurements were executed by automatic device (QUATRO KRIO 4.0 with LCR Agilent 4824A meter and BDS 1100 cryostat). The materials were investigated under cooling conditions with speed of 2 K/min and within frequency range from 20 Hz to 1 MHz. Findings: The dielectrometry was applied to measure complex dielectric permittivity and other dielectric functions of ferroelectric (Ba0.60Sr0.40)TiO3 (BST-40) and (Ba0.60Sr0.40)Ti0.8O3 (BST-40/0.8). It was affirmed, that 40% substitution of Sr ions as well as 20% deficiency of Ti ions in solid solution reduced temperature and changed the type of phase transformation. The transformation stood strongly diffused. The weak dependence of temperature Tm (peak of electric permittivity ε') from frequency of electric measuring field was observed. It means, that this material should be prescribed to the class of ferroelectrics with diffused phase transformation (DPT). The polar character of this solution was also observed in the paraelectric phase. It is connected with the occurrence of polar clusters in paraelectric phase. Practical implications: Results can be used to construct the model describing changes in the solid solutions with ferroactive and nonferroactive substitutions in sublattice A or B of the perovskite. Originality/value: Value of this work relies on the experimental examination of the electric properties of nonstoichiometric BST-40 solid solution. The low value of phase angle in the paraelectric phase was connected with the occurrence of the polar regions.
13
Content available remote Structure and properties of precipitation strengthened silver alloys
51%
Gryziecki J. , Sobota J.
|
2007
|
tom Vol. 52, iss. 4
665-671
EN
The paper presents the results of investigations of designed and manufactured silver alloys with additions, enabling by way of precipitation strengthening to obtain high strength properties and such additions which have high negative oxidation energy. In the manufactured alloys a high strengthening effect has been obtained as a result of the precipitation of Al4Cu9 phase during the decomposition of supersaturated solid solutions. On the other hand, the alloy additions with high negative oxidation energy formed a self-restoring oxide layer, protecting effectively against atmospheric corrosion. The composition of the obtained properties of the examined alloys guarantees good functional properties of the products made from these alloys as well as high aesthetic assets.
PL
Praca przedstawia wyniki badań nad zaprojektowanymi i wytworzonymi stopami srebra z dodatkami umożliwiającymi drogę umocnienia wydzieleniowego uzyskać wysokie właściwości wytrzymałościowe oraz takimi, które mają dużą ujemną energię utleniania. Osiągnięto w wytworzonych stopach silny efekt umocnieniowy w wyniku wydzielania się fazy Al4Cu9 podczas rozpadu przesyconych roztworów stałych. Natomiast dodatki stopowe o dużej ujemnej energii utleniania utworzyły warstwę tlenkową, samoodnawialną, chroniącą skutecznie przed korozją atmosferyczną. Zespół uzyskanych właściwości badanych stopów zapewnia wytworzonym z nich wyrobom dobre właściwości użytkowe oraz wysokie walory estetyczne.
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