Probing diffusive phase transition in Ba(Ti0.80 Zr0.20)O3-0.5(Ba0.70 Ca0.30)TiO3 nanofibers by temperature-dependent piezoelectric force microscopy

By using an atomic force microscopy, the friction behavior of a NiTi shape memory alloy is investigated under various temperatures in vacuum environment. Under wearless condition at low loads, the adhesion-dominated friction of NiTi is almost temperature independent. However, while scratch mark appears after friction at high loads, the plough-dominated friction force is found to decrease with the increaase in temperature. Based on a simple contact analysis, the temperature dependent friction behavior of NiTi at high loads may be mainly attributed to the thermoelastic phase transition in NiTi. While temperature increases from 26~100°C, the tensile phase transition stress of NiTi increases from 412~964 MPa, which induces ~27% magnitude decrease in the contact area between the diamond tip and NiTi. It further results in the decrease in the plough-dominated friction force on NiTi.

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Pressure-induced reversible metallization and phase transition in Zinc Telluride

Modern Physics Letters B ◽

10.1142/s0217984918503426 ◽

2018 ◽

Vol 32 (28) ◽

pp. 1850342 ◽

Cited By ~ 1

Author(s):

Yukai Zhuang ◽

Lidong Dai ◽

Heping Li ◽

Haiying Hu ◽

Kaixiang Liu ◽

...

Keyword(s):

Phase Transition ◽

Zinc Telluride ◽

Temperature Dependent ◽

Two Phase ◽

Force Microscopy ◽

Atomic Force ◽

Zinc Blende ◽

Transmission Electron ◽

Diamond Anvil ◽

Metal Phase Transition

The crystalline and electronic structural properties of Zinc Telluride (ZnTe) are investigated systematically up to [Formula: see text]25 GPa using a diamond anvil cell (DAC) in conjunction with a series of advanced optical and electrical testing methods at both non-hydrostatic and hydrostatic conditions. Based on Raman spectroscopy and AC impedance spectroscopy, ZnTe undergoes two phase transitions from initial zinc-blende phase to cinnabar phase at 7–9 GPa, then it transforms to Cmcm phase at 11–13 GPa under the non-hydrostatic condition. Meantime, the semiconductor to metal phase transition is verified by the temperature-dependent conductivity measurements. In these studies, the pressure points of phase transition and metallization of ZnTe are approximately same under the hydrostatic condition. The feeble influence of non-hydrostatic and hydrostatic conditions on the phase transition and metallization of ZnTe can be reasonably explained by its own crystalline structure from atomic force microscopy and high-resolution transmission electron microscopy.

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Temperature-Dependent Solid-state Luminescence and Reversible Phase Transition of (n-Bu4N)[Au(SC6H3-3,5-Me2)2]

Chemistry Letters ◽

10.1246/cl.2003.1002 ◽

2003 ◽

Vol 32 (11) ◽

pp. 1002-1003 ◽

Cited By ~ 4

Author(s):

Seiji Watase ◽

Takayuki Kitamura ◽

Nobuko Kanehisa ◽

Masami Nakamoto ◽

Yasushi Kai ◽

...

Keyword(s):

Phase Transition ◽

Solid State ◽

Temperature Dependent ◽

Reversible Phase Transition ◽

Reversible Phase ◽

State Luminescence

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Local ferroelectric polarization switching driven by nanoscale distortions in thermoelectric $${\text {Sn}}_{0.7}{\text {Ge}}_{0.3}{\text {Te}}$$

Scientific Reports ◽

10.1038/s41598-021-96299-3 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Aastha Vasdev ◽

Moinak Dutta ◽

Shivam Mishra ◽

Veerpal Kaur ◽

Harleen Kaur ◽

...

Keyword(s):

Thermal Conductivity ◽

Figure Of Merit ◽

Room Temperature ◽

Lattice Thermal Conductivity ◽

Direct Evidence ◽

Temperature Dependent ◽

Force Microscopy ◽

Ferroelectric Domains ◽

Pdf Analysis ◽

Ferroelectric Transition Temperature

AbstractA remarkable decrease in the lattice thermal conductivity and enhancement of thermoelectric figure of merit were recently observed in rock-salt cubic SnTe, when doped with germanium (Ge). Primarily, based on theoretical analysis, the decrease in lattice thermal conductivity was attributed to local ferroelectric fluctuations induced softening of the optical phonons which may strongly scatter the heat carrying acoustic phonons. Although the previous structural analysis indicated that the local ferroelectric transition temperature would be near room temperature in $${\text {Sn}}_{0.7}{\text {Ge}}_{0.3}{\text {Te}}$$ Sn 0.7 Ge 0.3 Te , a direct evidence of local ferroelectricity remained elusive. Here we report a direct evidence of local nanoscale ferroelectric domains and their switching in $${\text {Sn}}_{0.7}{\text {Ge}}_{0.3}{\text {Te}}$$ Sn 0.7 Ge 0.3 Te using piezoeresponse force microscopy(PFM) and switching spectroscopy over a range of temperatures near the room temperature. From temperature dependent (250–300 K) synchrotron X-ray pair distribution function (PDF) analysis, we show the presence of local off-centering distortion of Ge along the rhombohedral direction in global cubic $${\text {Sn}}_{0.7}{\text {Ge}}_{0.3}{\text {Te}}$$ Sn 0.7 Ge 0.3 Te . The length scale of the $${\text {Ge}}^{2+}$$ Ge 2 + off-centering is 0.25–0.10 Å near the room temperatures (250–300 K). This local emphatic behaviour of cation is the cause for the observed local ferroelectric instability, thereby low lattice thermal conductivity in $${\text {Sn}}_{0.7}{\text {Ge}}_{0.3}{\text {Te}}$$ Sn 0.7 Ge 0.3 Te .

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Understanding the effect of urea on the phase transition of poly(N-isopropylacrylamide) in aqueous solution by temperature-dependent near-infrared spectroscopy

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy ◽

10.1016/j.saa.2021.119573 ◽

2021 ◽

Vol 253 ◽

pp. 119573

Author(s):

Biao Ma ◽

Li Wang ◽

Li Han ◽

Wensheng Cai ◽

Xueguang Shao

Keyword(s):

Phase Transition ◽

Aqueous Solution ◽

Infrared Spectroscopy ◽

Near Infrared Spectroscopy ◽

Near Infrared ◽

Temperature Dependent

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Temperature Dependence of Electrical Properties and Crystal Structure of 0.29Pb(In1/2Nb1/2)O3–0.44Pb(Mg1/3Nb2/3)O3–0.27PbTiO3Single Crystals

Advances in Condensed Matter Physics ◽

10.1155/2013/382140 ◽

2013 ◽

Vol 2013 ◽

pp. 1-5

Author(s):

Qian Li ◽

Yun Liu ◽

Andrew Studer ◽

Zhenrong Li ◽

Ray Withers ◽

...

Keyword(s):

Crystal Structure ◽

Phase Transition ◽

Electrical Properties ◽

Dielectric Permittivity ◽

Neutron Diffraction ◽

Electrical Measurement ◽

Temperature Dependent ◽

Electromechanical Properties ◽

Polar Order

We characterized the temperature dependent (~25–200°C) electromechanical properties and crystal structure of Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3single crystals usingin situelectrical measurement and neutron diffraction techniques. The results show that the poled crystal experiences an addition phase transition around 120°C whereas such a transition is absent in the unpoled crystal. It is also found that the polar order persists above the maximum dielectric permittivity temperature at which the crystal shows a well-defined antiferroelectric behavior. The changes in the electrical properties and underlying crystal structure are discussed in the paper.

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The variational approach to the Glashow–Weinberg–Salam model

Canadian Journal of Physics ◽

10.1139/p87-049 ◽

1987 ◽

Vol 65 (4) ◽

pp. 395-402 ◽

Cited By ~ 4

Author(s):

R. Manka ◽

J. Sladkowski

Keyword(s):

Phase Transition ◽

Effective Potential ◽

Variational Approach ◽

Canonical Quantization ◽

Temperature Dependent ◽

Model Based

The variational approach to the Glashow–Weinberg–Salam model, based on canonical quantization, is presented. It is shown that taking into consideration the Becchi–Rouet–Stora symmetry leads to the correct, temperature-dependent, effective potential. This generalization of the Weinberg–Coleman potential leads to a phase transition of the first kind.

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Ionic Conductivity and Phase Transition Behaviour in 4AgI-(1-)-2CuI System

Research Letters in Physics ◽

10.1155/2008/249402 ◽

2008 ◽

Vol 2008 ◽

pp. 1-4 ◽

Cited By ~ 7

Author(s):

Mohammed Hassan ◽

Rfi Rafiuddin

Keyword(s):

Phase Transition ◽

Ionic Conductivity ◽

Binary System ◽

High Temperature Phase ◽

Temperature Phase ◽

Conductivity Measurements ◽

Temperature Dependent ◽

X Ray ◽

Dsc Curves ◽

Transition Behaviour

Samples of general formula 4AgI-(1-)-2CuI, , have been prepared and investigated by XRD, DSC, and temperature-dependent conductivity studies. X-ray diffractograms showed the presence of binary system consisting of AgI and in the sample . Cu-substituted samples showed very similar diffractograms to that of the pure compound which indicates that no effect for the substitution on the nature of the binary system. DSC curves showed the presence of phase transition whose temperature increased with ratio in the system. Ionic conductivity measurements confirmed the occurrence of the phase transition and showed that the high temperature phase is superionic conducting, whose conductivity increases with the increasing amount in the system.

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