Search results

1

Phase transition in CeSe, EuSe and LaSe under high pressure

100%

Singh S., Singh R., Gour A.

Open Physics

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2007

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vol. 5

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issue 4

576-585

EN

The high pressure phase transition and elastic behavior of rare earth monoselenides (CeSe, EuSe and LaSe) which crystallize in a NaCl-structure have been investigated using the three body interaction potential (TBIP) approach. These interactions arise due to the electronshell deformation of the overlapping ions in crystals. The TBP model consists of a long range Coulomb, three body interactions and the short range overlap repulsive forces operative up to the second neighboring ions. The authors of this paper estimated the values of the phase transition pressure and the associated volume collapse to be closer than other calculations. Thus, the TBIP approach also promises to predict the phase transition pressure and pressure variations of elastic constants of lanthanide compounds.

2

Composition-induced phase transition in a [Ag2HgI4:0.2AgI] mixed composite system doped with CuI

100%

Noorussaba, Ahmad A.

Open Chemistry

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2010

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vol. 8

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issue 6

1227-1235

EN

A novel composite superionic system, [Ag2HgI4:0.2AgI]:xCuI, (x = 0.2, 0.4, 0.6 mol. wt.%), was prepared and [Ag2HgI4:0.2AgI] mixed system was used as the host. Electrical conductivity was measured to study the transition behavior at frequencies of 100 Hz, 120 Hz, 1 kHz, and 10 kHz in the temperature range 90°–170°C by a Gen Rad 1659 RLC Digibridge. Sharp increase in conductivity was observed for β-α phase transitions. As a result of increase in the dopant-to-host ratio, the conductivity of the system exhibited Arrhenius (thermally activated)-type behavior. X-ray powder diffraction, differential scanning calorimetry (DSC), differential thermal analysis (DTA) and thermo-gravimetric analysis (TGA) studies confirmed the doping effect on the transition in the host, the phase transition temperature increased with an increase in the dopant concentration. Activation energies for the system in eV both for the pretransition and post-transition phase transformations are reported. The addition of CuI to [Ag2HgI4:0.2AgI] shifted the phase transition of the host [Ag2HgI4:0.2AgI], due to an interaction between [Ag2HgI4:0.2AgI] and CuI.

3

Effects of chain decays, radial flow and U A(1) restoration on the low-mass dilepton enhancement in $$\sqrt {s_{NN} } = 200$$ GeV Au+Au reactions

100%

Vargyas M., Csörgő T., Vértesi R.

Open Physics

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2013

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vol. 11

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issue 5

553-559

EN

In $$\sqrt {s_{NN} } = 200$$ GeV Au+Au collisions PHENIX reported a significant enhancement in the low-mass region (0.1 < m ee < 0.7 GeV) of the dielectron spectrum, which is still not fully understood. Several theoretical works and an indirect measurement suggest, due to the possible restoration of the U A(1) part of the chiral symmetry in a hot and dense medium, that the mass of the η′ meson may substantially decrease. This work reports on a statistically acceptable description of the PHENIX low-mass dilepton enhancement using a radial flow dominated meson spectra, chain decays of long-lived resonances and an in-medium η′ mass modification.

4

Phase transitions of K2TaF7 within 680–800°C

100%

Kosa L., Macková I., Proks I., Pritula O., Smrčok Ľ., Boča M., Rundlőf H.

Open Chemistry

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2008

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vol. 6

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issue 1

27-32

EN

Three thermal effects on heating/cooling of K2TaF7 in the temperature interval of 680–800°C were investigated by the DSC method. The values determined for the enthalpy change of the individual processes are: ΔtransIIHm(K2TaF7; 703°C) = 1.7(2) kJ mol−1, ΔtransIHm(K2TaF7; 746°C) = 19(1) kJ mol−1 and ΔtransIIIHm(K2TaF7; 771°C) = 13(1) kJ mol−1. The first thermal effect was attributed to a solid-solid phase transition; the second to the incongruent melting of K2TaF7 and the third to mixing of two liquids. These findings are supported by in situ neutron powder diffraction experiments performed in the temperature interval of 654–794°C. [...]

5

PHASE TRANSITION AND PLASTICITY ENHANCEMENT OF Ti-Cu-BASED BULK METALLIC GLASSES

86%

Wang L., Zhang G., Sun X., Wang X.

Archives of Metallurgy and Materials

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2018

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vol. 63

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issue 1

6

Phase Transitions and Electrochemical Corrosion Behaviors of Ti50Ni50-xCux Shape Memory Alloys for Metallic Biomaterials

86%

Lee K., Rho S., Lee K., Rho S.

Archives of Metallurgy and Materials

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2020

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vol. 65

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issue 4

7

The effect of calcium substitution on the afterglow of Eu2+/Dy3+ doped Sr4Al14O25

86%

Dacyl D., Uhlich D., Jüstel T.

Open Chemistry

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2009

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vol. 7

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issue 2

164-167

EN

The effect of calcium substitution on the afterglow of tetrastrontium aluminate phosphors (Sr4Al14O25:Eu2+, Dy3+) was investigated. A series of (Sr1-xCax)O⊎nAl2O3:Eu2+(1%), Dy3+(0.5%), with variation of calcium content (x = 0 − 1), were synthesized by a high temperature solid state reaction in a reducing atmosphere. The photoluminescence, persistent luminescence (afterglow), and lumen equivalents of these materials were studied and compared. It turned out that the afterglow properties of the phosphors were strongly dependent on the Sr/Ca ratio. As the Ca content increased, a phase transition and blue shift in emission spectra were observed. [...]

Refine search results

Phase transition in CeSe, EuSe and LaSe under high pressure

Composition-induced phase transition in a [Ag2HgI4:0.2AgI] mixed composite system doped with CuI

Effects of chain decays, radial flow and U A(1) restoration on the low-mass dilepton enhancement in $$\sqrt {s_{NN} } = 200$$ GeV Au+Au reactions

Phase transitions of K2TaF7 within 680–800°C

PHASE TRANSITION AND PLASTICITY ENHANCEMENT OF Ti-Cu-BASED BULK METALLIC GLASSES

Phase Transitions and Electrochemical Corrosion Behaviors of Ti50Ni50-xCux Shape Memory Alloys for Metallic Biomaterials

The effect of calcium substitution on the afterglow of Eu2+/Dy3+ doped Sr4Al14O25