Atomic vibrations and thermal expansion of some silicates at high temperatures
Abstract
At present improved experimental techniques permit precise collection of intensity data at elevated temperatures, thus allowing a quantitative study of the temperature dependence of the structural parameters. However, our understanding of the process of thermal expansion is still poor, due to lack of precise data on the behavior of the vibrational properties of atoms. This is discussed by correlating concepts of crystal dynamics with modern theories of chemical bonding.
The role of transverse vibrations in bridging-oxygen atoms is emphasized, by studying an ideal isolated Si–O–Si system at its equilibrium position and considering cation-anion interactions which obey Hooke's elasticity law. The resultant changes in the value of the Si–O–Si angle are interpreted in terms of redistribution of energy modes which are considered responsible for preferential expansion of a crystal structure. Such concepts are applied to the study of the thermal behavior of a number of silicates (diopside, tremolite, beryl). Particular emphasis is given to the relationship between the thermal expansion of low and high quartz.
Articles in the same Issue
- The crystal structure of jordanite, Pb28As12S46*
- Crystal structure of a synthetic lithium zeolite
- The crystal structure of synthetic MgIV mica
- Die Molekular- und Kristallstruktur des Zimtsäurepyrrolidids C13H15ON*
- Verfeinerung der Kristallstruktur von Cerussit, PbCO3
- Verfeinerung der Kristallstruktur von K2Cu(C2O4)2 · 2 H2O
- Die Kristallstruktur von Caesium-Kupfer(II)-Oxalat-Dihydrat, Cs2Cu(C2O4) · 2H2O
- Zur Entwicklung des Begriffs “Gitterkomplex”
- Zur Definition des Punktlagen- und Gitterkomplex-Begriffes
- Eine Definition des Begriffs “Gitterkomplex”
- Röntgenographische Bestimmung der fehlgeordneten Schichtfolgen in Graphit-FeCl3-Einlagerungsverbindungen
- Atomic vibrations and thermal expansion of some silicates at high temperatures
- Ramanspektroskopische Untersuchungen an KJO3-Kristallen
- Lattice parameters and space group of plumbagin
Articles in the same Issue
- The crystal structure of jordanite, Pb28As12S46*
- Crystal structure of a synthetic lithium zeolite
- The crystal structure of synthetic MgIV mica
- Die Molekular- und Kristallstruktur des Zimtsäurepyrrolidids C13H15ON*
- Verfeinerung der Kristallstruktur von Cerussit, PbCO3
- Verfeinerung der Kristallstruktur von K2Cu(C2O4)2 · 2 H2O
- Die Kristallstruktur von Caesium-Kupfer(II)-Oxalat-Dihydrat, Cs2Cu(C2O4) · 2H2O
- Zur Entwicklung des Begriffs “Gitterkomplex”
- Zur Definition des Punktlagen- und Gitterkomplex-Begriffes
- Eine Definition des Begriffs “Gitterkomplex”
- Röntgenographische Bestimmung der fehlgeordneten Schichtfolgen in Graphit-FeCl3-Einlagerungsverbindungen
- Atomic vibrations and thermal expansion of some silicates at high temperatures
- Ramanspektroskopische Untersuchungen an KJO3-Kristallen
- Lattice parameters and space group of plumbagin
