نتایج جستجو برای: tetragonal phase
تعداد نتایج: 601737 فیلتر نتایج به سال:
Zirconia femoral heads retrieved from patients after different implantation periods (up to 13 years) were analysed using vertical scanning interferometry, atomic force microscopy and Raman microspectroscopy. A range of topographical and compositional changes on the surface of the retrievals are reported in this work. The study revealed that changes in roughness are the result of a combination o...
We address the controversial issue of the structural stability of Li7La3Zr2O12 garnets, focusing on the mechanisms that result in the transformation from tetragonal to cubic symmetry. We show that undoped tetragonal Li7La3Zr2O12 not exposed to humidity at any moment undergoes a reversible phase transition to cubic symmetry at Tc x 645 C that we ascribe to lithium dynamic effects. On the other h...
Dielectric and polarization measurements were made on single crystal BaTi03 in a hydrostatic medium to 38 kbar. The nature of the ferroelectric phase transition is observed to go from first to second order near 35 kbar and —40 C. The pressure —temperature —electric-field phase diagram of BaTi03 is measured. The tricritical point is indicated in this part of the phase diagram by a change in shap...
We demonstrate that the changes in the elastic properties of the FeAs systems, as seen in our resonant ultrasound spectroscopy data, can be naturally understood in terms of fluctuations of emerging nematic degrees of freedom. Both the softening of the lattice in the normal, tetragonal phase as well as its hardening in the superconducting phase are consistently described by our model. Our result...
We report a first-order phase transition at TM=357 K in single crystal Ca2RuO4, an isomorph to the superconductor Sr2RuO4. The discontinuous decrease in electrical resistivity signals the near d e struction of the Mott insulating phase and is triggered by a s t ructural transition from the low temperature orthorhombic to a high temperature tetragonal phase. The magnetic susceptibility, which is...
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