• journal_title：American Mineralogist
• Contributor：Hongwu Xu ; Yusheng Zhao ; Jianzhong Zhang ; Yuejian Wang ; Donald D. Hickmott ; Luke L. Daemen ; Monika A. Hartl ; Liping Wang
• Publisher：Mineralogical Society of America
• Date：2010-
• Format：text/html
• Language：en
• Identifier：10.2138/am.2010.3280
• journal_abbrev：American Mineralogist
• issn：0003-004X
• volume：95
• issue：1
• firstpage：19
• section：Articles

The elastic properties of jarosite were investigated using synchrotron X-ray diffraction coupled with a multi-anvil apparatus at pressures up to 8.1 GPa. With increasing pressure, the c dimension contracts much more rapidly than a, resulting in a large anisotropy in compression. This behavior is consistent with the layered nature of the jarosite structure, in which the (001) [Fe(O,OH)₆]/[SO₄] sheets are held together via relatively weak K-O and hydrogen bonds. Fitting of the measured unit-cell parameters to the second-order Birch-Murnaghan equation of state yielded a bulk modulus of 55.7 ± 1.4 GPa and zero-pressure linear compressibilities of 3.2 × 10⁻³ GPa⁻¹ for the a axis and 13.6 × 10⁻³ GPa⁻¹ for the c axis. These parameters represent the first experimental determination of the elastic properties of jarosite.