Compressional behaviour of CaNiSi2O6 clinopyroxene: bulk modulus systematic and cation type in clinopyroxenes |
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| Authors: | Fabrizio Nestola Tiziana Boffa Ballaran Mario Tribaudino Haruo Ohashi |
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| Institution: | (1) Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany;(2) Dipartimento di Scienze della Terra, Università degli Studi di Parma, Parco Area delle Scienze 157/A, 43100 Parma, Italy;(3) HASHI Institute for Silicate Science Nishinakanobu, 1-9-25, Shinagawa, Tokyo 142-0054, Japan |
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| Abstract: | A single-crystal of composition CaNiSi2O6 (space group C2/c) was investigated at high pressure up to about 7.8 GPa by X-ray diffraction. The unit-cell parameters were measured at 18 different pressures. The P-V data were fitted by a third-order Birch-Murnaghan equation of state V0=435.21(1) Å3, K 0=117.6(3) GPa and K =6.4(1). The linear axial compressibilities  a, b, c and a sin are 2.14(1), 3.00(1), 2.43(1) and 1.63(1) × 10–3 GPa–1. Comparing the compressibility data with other CaM1Si2O6 pyroxenes we suggest that the empirical K × V = constant relationships are followed in C2/c pyroxenes only if the same valence electron character is shared. |
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| Keywords: | High pressure Compressibility Single-crystal XRD Systematic |
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