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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01 Jan 1986
TL;DR: In this article, electron paramagnetic resonance spectra were taken from powder specimens of cristobalite and tridymite at 9.6 GHz and temperatures between - l20"C and 300"C.
Abstract: Electron paramagnetic resonance spectra were taken from powder specimens of cristobalite and tridymite at 9. l6 GHz and temperatures between - l20"C and 300"C. The spectra exhibit significant signals around g"n : 4 which arise from Fe3* ions in strong orthorhombic crystal fields. Fe3+ is assumed to substitute for Sio* in both cristobalite and tridymite. The charge deficiency produced thereby is compensated by a nearest interstitially incorporated Na+ ion. In cristobalite two crystallographically different Fe3+ centers occur which indicate a possible symmetry lowering of the space group symmetry of low cristobalite from P4,2r2 to its subgroup C222r. The broadening of the electron paramagnetic resonance signals in tridymite is associated with a certain number of Fe3+ centers differing so slightly that their particular signals cannot be resolved.
7 citations
TL;DR: In this paper, a new framework compound, [Hg4As2](InBr3.5As0.5) (1), has been prepared by the solid-state reaction of Hg2Br2 with elemental In and As at 450°C.
7 citations
TL;DR: In this article, the chemical composition of cristobalite, tridymite, glass, and accessory phases of different zones of used silica bricks taken from the roof of a glass tank was studied with a high resolution microprobe.
7 citations
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04 Jun 1993
TL;DR: In this article, the authors proposed a structurally dense silica brick having excellent heat conductivity, pressure resistance and wear resistance at high temp., prolonging the service life of the body of a furnace and capable of saving the energy.
Abstract: PURPOSE:To provide a structurally dense silica brick having excellent heat conductivity, pressure resistance and wear resistance at high temp., prolonging the service life of the body of a furnace and capable of saving the energy. CONSTITUTION:This dense silica brick has a compsn. contg. cristobalite and tridymite subjected to transition as crystal phases in (10-40):(90-60) ratio (wt.%) and 2-12wt.% metal oxide other than SiO2 and existing as an amorphous phase and has >=1.95 bulk density and <=15% porosity. When colloidal silica is impregnated into this silica brick, a denser silica brick having higher wear resistance is obtd.
7 citations
TL;DR: A review of the chemical methods of analysis for crystalline silica presented at the Chemical Manufacturers Association Crystalline Silica Panel Workshop on November 18, 1991 and their International Symposium in August 20−21, 1992 can be found in this article.
7 citations