Viscosity of the Binary Gaseous Mixtures of Nitrogen with Argon and Krypton
This paper presents new measurements of the viscosity of the binary mixtures N2Ar and N2Kr both at zero density and in the temperature range 25–500°C. The measurements are compared with exte...
This paper presents new measurements of the viscosity of the binary mixtures N2Ar and N2Kr both at zero density and in the temperature range 25–500°C. The measurements are compared with exte...
Energy Nonrandomized Decomposition in Spiropentane Initiated by Recoil Tritium Substitution Reactions
Raman Spectra of 
and 
Cristobalite
J. Chem. Phys. 57, 4042 (1972); doi:10.1063/1.1678878
Issue Date: 1 November 1972
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Raman spectra of polycrystalline crystobalite were measured over the frequency interval of the fundamental optical modes from 77°K to 538°C. Spectra recorded above and below the ![[Single Bond]](http://scitation.aip.org/stockgif3/sngbnd.gif)
transition temperature were strikingly different. The strong bands measured at 416 and 230 cm−1 with cristobalite at 25°C were not observed from spectra of the phase. The Raman spectrum of cristobalite exhibited only three bands and, in contrast to crystalline quartz, a strongly temperature dependent band was not observed from measurements at temperatures near the transition point. Infrared reflection spectra of cristobalite also were recorded, and the longitudinal optical mode frequencies were determined. Raman spectra of cristobalite showed that the structure of this material should not be employed as a lattice model for noncrystalline SiO2.
©1972 The American Institute of Physics
transition temperature were strikingly different. The strong bands measured at 416 and 230 cm−1 with cristobalite at 25°C were not observed from spectra of the phase. The Raman spectrum of cristobalite exhibited only three bands and, in contrast to crystalline quartz, a strongly temperature dependent band was not observed from measurements at temperatures near the transition point. Infrared reflection spectra of cristobalite also were recorded, and the longitudinal optical mode frequencies were determined. Raman spectra of cristobalite showed that the structure of this material should not be employed as a lattice model for noncrystalline SiO2.
©1972 The American Institute of Physics
| History: | Received 14 June 1972 |
| Permalink: |
http://link.aip.org/link/?JCPSA6/57/4042/1 |
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REFERENCES (17)
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