| Autor: |
Fabrizio Nestola, Gabriella Lucchetti, Ronald Miletich, Daria Pasqual, Benedetta Periotto, Donato Belmonte, L. Nardini |
| Jazyk: |
angličtina |
| Rok vydání: |
2012 |
| Předmět: |
|
| Popis: |
A natural crystal with NaMnSi 2 O 6 composition (space group C 2/ c ) belonging to the family of clinopyroxene structures was investigated by in-situ high-pressure single-crystal X-ray diffraction up to 9 GPa in order to verify if the compressibility can be predicted from the unit-cell volume V 0 at 1 bar applying an established volume–compressibility relationship. Together with data for isostructural analogue phases the equation-of-state parameters of NaMnSi 2 O 6 showed that such simplified relationship can not be longer applied. The findings demonstrate that prediction models for isostructural series are consistent not only for the aspect of structural isotopy, and valid relationships presuppose similar character of the electronic structure. In case of pyroxenes containing transition elements the established relationship is only valid for series of compounds with cations of identical oxidation state according to isovalent electronic character. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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