Compressibility of NaMnSi₂O₆: The role of electronic isovalency for the validity of bulk-modulus-volume relationship

Autor(en)

Fabrizio Nestola, L. Nardini, D. Pasqual, Benedetta Periotto, G. Lucchetti, Ronald Miletich-Pawliczek, D. Belmonte

Abstrakt

A natural crystal with NaMnSi2O6 composition (space group C2/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 V0 at 1 bar applying an established volume-compressibility relationship. Together with data for isostructural analogue phases the equation-of-state parameters of NaMnSi2O6 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.

Organisation(en)

Institut für Mineralogie und Kristallographie

Externe Organisation(en)

Università degli Studi di Padova, University of Copenhagen, Università degli Studi di Genova

Journal

Solid State Sciences

Band

14

Seiten

1036-1039

Anzahl der Seiten

4

ISSN

1293-2558

Publikationsdatum

2012

Peer-reviewed

Ja

ÖFOS 2012

105116 Mineralogie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/cb8730c1-944f-43fd-94de-311ce9055074