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New thermoelastic parameters of natural C2/c omphacite

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Abstract

The compressibility at room temperature and the thermal expansion at room pressure of two disordered crystals (space group C2/c) obtained by annealing a natural omphacite sample (space group P2/n) of composition close to Jd56Di44 and Jd55Di45, respectively, have been studied by single-crystal X-ray diffraction. Using a Birch–Murnaghan equation of state truncated at the third order [BM3-EoS], we have obtained the following coefficients: V 0 = 421.04(7) Å3, K T0 = 119(2) GPa, K′ = 5.7(6). A parameterized form of the BM3 EoS was used to determine the axial moduli of a, b and c. The anisotropy scheme is β c  ≤ β a  ≤ β b , with an anisotropy ratio 1.05:1.00:1.07. A fitting of the lattice variation as a function of temperature, allowing for linear dependency of the thermal expansion coefficient on the temperature, yielded αV(1bar,303K) = 2.64(2) × 10−5 K−1 and an axial thermal expansion anisotropy of α b  ≫ α a  > α c . Comparison of our results with available data on compressibility and thermal expansion shows that while a reasonable ideal behaviour can be proposed for the compressibility of clinopyroxenes in the jadeite–diopside binary join [K T0 as a function of Jd molar %: K T0 = 106(1) GPa + 0.28(2) × Jd(mol%)], the available data have not sufficient quality to extract the behaviour of thermal expansion for the same binary join in terms of composition.

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Acknowledgments

Roberto Gastoni CNR-Pavia is thanked for sample preparation for EMPA analyses, and R. Carampin of CNR-Padova is thanked for help with the WDS electron microprobe facilities. This work was funded by the Italian Ministry of University and Research (MIUR) and by F.A.R. of the University of Pavia. The paper benefited from the critical reviews of two anonymous reviewers.

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Authors and Affiliations

  1. Dipartimento di Scienze della Terra e dell’Ambiente, Università di Pavia, via Ferrata 1, 27100, Pavia, Italy

    Francesco Pandolfo & M. Chiara Domeneghetti

  2. Dipartimento di Geoscienze, Università di Padova, via Gradenigo 6, 35131, Padua, Italy

    Fabrizio Nestola

  3. Dipartimento di Scienze della Terra, Università degli Studi di Torino, via Valperga Caluso 35, 10125, Torino, Italy

    Fernando Cámara

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  1. Francesco Pandolfo
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  2. Fabrizio Nestola
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  3. Fernando Cámara
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  4. M. Chiara Domeneghetti
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Correspondence to Francesco Pandolfo.

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Pandolfo, F., Nestola, F., Cámara, F. et al. New thermoelastic parameters of natural C2/c omphacite. Phys Chem Minerals 39, 295–304 (2012). https://doi.org/10.1007/s00269-012-0484-1

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