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Minerals 2018, 8(12), 591;

Equation of State of a Natural Chromian Spinel at Ambient Temperature

School of Earth and Space Sciences, Peking University, Beijing 100871, China
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education of China, Beijing 100871, China
Department of Earth Sciences, University of Western Ontario, London, ON N6A 5B7, Canada
College of Chemistry & Chemical Engineering, Northeast Petroleum University, Daqing 163318, China
Author to whom correspondence should be addressed.
Received: 13 November 2018 / Revised: 4 December 2018 / Accepted: 5 December 2018 / Published: 13 December 2018
(This article belongs to the Special Issue Spinel Group Minerals)
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A natural chromian spinel with the composition (Mg0.48(3)Fe0.52(3))(Fe0.06(1)Al0.28(1)Cr0.66(2))2O4 was investigated up to 15 GPa via synchrotron X-ray diffraction with a diamond-anvil cell at room temperature. No phase transition was clearly observed up to the maximum experimental pressure. The pressure–volume data fitted to the third-order Birch–Murnaghan equation of state yielded an isothermal bulk modulus ( K T 0 ) of 207(5) GPa and its first pressure derivative ( K T 0 ) of 3.2(7), or K T 0 = 202(2) GPa with K T 0 fixed as 4. With this new experimental result and the results on some natural chromian spinels in the literature, a simple algorithm describing the relation between the K T 0 and the compositions of the natural chromian spinels was proposed. To examine this algorithm further, more compression experiments should be performed on natural chromian spinels with different chemical compositions. View Full-Text
Keywords: chemical composition; diamond anvil-cell; equation of state; natural chromian spinel chemical composition; diamond anvil-cell; equation of state; natural chromian spinel

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Mi, Z.; Shi, W.; Zhang, L.; Shieh, S.R.; Liu, X. Equation of State of a Natural Chromian Spinel at Ambient Temperature. Minerals 2018, 8, 591.

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