Effects of the interaction between radiation and a disintegrating vitreous material

1979 ◽  
Vol 13 (5) ◽  
pp. 741-745
Author(s):  
A. S. Senchenkov
Keyword(s):  
Vitreous Material

Archaeometric analysis of vitreous material ornaments from the Villa di Villa site (Treviso, Italy)

2015 ◽  
Vol 26 (4) ◽  
pp. 513-527 ◽  
Author(s):  
Giulia Olmeda ◽  
Ivana Angelini ◽  
Gianmario Molin ◽  
Stefano Boaro ◽  
Giovanni Leonardi
Keyword(s):  
Vitreous Material

Synthesis of K2SiSi3O9 with silicon in 4- and 6-coordination

1975 ◽  
Vol 40 (312) ◽  
pp. 401-404 ◽  
Author(s):  
N. Kinomura ◽  
S. Kume ◽  
M. Koizumi
Keyword(s):  
High Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vitreous Material ◽  
Natural Crystal ◽  
High Temperature And Pressure ◽  
Temperature And Pressure ◽  
Diffraction Patterns ◽  
Three Phases

SummaryTwo kinds of vitreous material with composition K2GeSi3O9 and K2Si4O9 were treated under conditions of high temperature and pressure. The X-ray diffraction patterns of the products were similar to that of K2TiSi3O9, which has the wadeite, K2ZrSi3O9, structure.A natural crystal of K-feldspar was also treated under the same conditions. The product was found to consist of three phases, coesite, kyanite, and the above-mentioned K2Si4O9. Since Zr ions in wadeite are in a 6-coordinated site, one-quarter of Si ions in K2Si4O9 are considered to be in 6-coordination. This is the first silicate in which Si ions occupy sites of 4- and 6-coordinations in one crystal at the same time.

Architecture of the Earth

Geophysics ◽  
1939 ◽  
Vol 4 (1) ◽  
pp. 76-77
Author(s):  
A. P. Wendler
Keyword(s):  
High Pressures ◽  
Earth Model ◽  
Iron Core ◽  
Vitreous Material ◽  
Continuous Layer ◽  
The Earth ◽  
Crystalline Crust ◽  
Rigid Mass

Daly’s earth model has a solid crystalline crust varying in thickness but not exceeding fifty miles. This crust encloses a continuous layer of vitreous rock, relatively thin, which rests on a denser vitreous material. The heavier substratum surrounds a so‐called “iron core” possibly crystallized by high pressures of the interior. This vitreous subcrust has some properties of a solid; hence, it behaves more or less like a rigid mass.

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