Topic
Tridymite
About: Tridymite is a research topic. Over the lifetime, 840 publications have been published within this topic receiving 14831 citations.
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TL;DR: In this paper, the high-temperature behavior of CH4-rich melanophlogite (MEP) from Mt. Hamilton was studied by Raman spectroscopy within the range of 30-1000°C.
3 citations
TL;DR: In this article, phase equilibria of the AgO0.5-"FeO1.5"-SiO2 system were investigated in the range of 1563-1913 K (1290-1640 degrees C) for oxide liquid (slag) in equilibrium with the gas with controlled oxygen partial pressure.
3 citations
TL;DR: In this paper, the thallium-beryllium monophosphate is related to the β-SiO 2 tridymite structural kind and the phase II, stable at room temperature, is found to have orthorhombic symmetry mm2.
Abstract: The thallium-beryllium monophosphate is related to the β-SiO 2 tridymite structural kind. The phase II, stable at room temperature, is found to have orthorhombic symmetry mm2. It sustains a displacive transformation at 919 o C leading to centric phase I with symmetry mmm. In the low-temperature form, the 6s 2 electron pair of Tl + cation is oriented along polar axis, inducing a significant distortion of the oxygen framework; the ferroelectric nature of phase II is pointed out by the strong increase of the dielectric stiffness around Curie temperature. Phase transition results of bound rotations of PO 4 and BeO 4 tetrahedra, the rise of symmetry order leading to the loss of hybridization of the lone pair. According to the displacive transition mechanism, both thermal and dielectric properties show typical second order features
3 citations
3 citations
01 Jan 1963
3 citations