Phase Transition and EOS of Marmatite (Zn<suB>0.76</suB>Fe<suB>0.23</suB>S) up to 623K and 17GPa

Chin. Phys. Lett.

2007, Vol. 24

Issue (1): 287-290 DOI:

Original Articles

Phase Transition and EOS of Marmatite (Zn_0.76Fe_0.23S) up to 623K and 17GPa

JIANG Xi^1,3;ZHOU Wen-Ge¹;XIE Hong-Sen¹;LIU Yong-Gang¹;FAN Da-Wei^1,3;LIU Jing^1,2;LI Yan-Chun²;LUO Chong-Ju²;MA Mai-Ning³

¹Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002 ²Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 ³Graduate School of Chinese Academy of Sciences, Beijing 100049

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JIANG Xi, ZHOU Wen-Ge, XIE Hong-Sen et al 2007 Chin. Phys. Lett. 24 287-290

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Abstract In situ energy dispersive x-ray diffraction for natural marmatite (Zn_0.76Fe_0.23S) is performed up to 17.7GPa and 623K. It is fitted by the Birch--Murnaghan equation of state (EOS) that K₀ and α₀ for marmatite are 85(3)GPa and 0.79(16)×10^-4K^-1, respectively. Fe²⁺ isomorphic replacing to Zn²⁺ in natural crystal is responsible for high bulk modulus and thermal expansivity of marmatite. Temperature derivative of bulk modulus (∂K/∂T)_P for marmatite is fitted to be -0.044(23)GPaK^-1. The unambiguous B3--B1 phase boundaries for marmatite are determined to be P_upper(GPa)=15.50-0.016 T(°C) and P_lower (GPa)=9.94--0.012T(°C) at 300--623K.

Keywords: 91.60.Fe 91.60.Hg

Published: 01 January 2007

PACS:	91.60.Fe	(Equations of state)
	91.60.Hg	(Phase changes)

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	JIANG Xi
	ZHOU Wen-Ge
	XIE Hong-Sen
	LIU Yong-Gang
	FAN Da-Wei
	LIU Jing
	LI Yan-Chun
	LUO Chong-Ju
	MA Mai-Ning

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