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American Mineralogist; February 2006; v. 91; no. 2-3; p. 327-332; DOI: 10.2138/am.2006.1879
© 2006 Mineralogical Society of America
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Equation of state and phase transition in KAlSi3O8 hollandite at high pressure

Tristan Ferroir1, Tsuyoshi Onozawa2, Takehiko Yagi2,*, Sebastien Merkel2, Nobuyoshi Miyajima2, Norimasa Nishiyama3, Tetsuo Irifune3 and Takumi Kikegawa4

1 Ecole Normale Superieure de Lyon, 69364 Lyon cedex 07, France
2 Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
3 Geodynamics Research Center, Ehime University, Matsuyama 790-8577, Japan
4 Photon Factory, KEK, Tsukuba, Ibaraki 305-0801, Japan

Correspondence: * E-mail: yagi{at}issp.u-tokyo.ac.jp

The tetragonal hollandite structure (KAlSi3O8 hollandite) has been studied up to 32 GPa at room temperature using high-pressure in-situ X-ray diffraction techniques. A phase transformation from tetragonal I4/m phase to a new phase was found to occur at about 20 GPa. This transition is reversible on release of pressure without noticeable hysteresis and hence this new high-pressure phase is unquenchable to ambient conditions. The volume change associated with the transition is found to be small (not measurable), suggesting a second order transition. The diffraction pattern of the high-pressure phase can be indexed in a monoclinic unit cell (space group I2/m), which is isostructual with BaMn8O16 hollandite. The {gamma} angle of the monoclinic unit cell increases continuously above the transition. A Birch-Murnaghan equation of state fit to pressure-volume data obtained for KAlSi3O8 hollandite yields a bulk modulus K0 = 201.4 (7) GPa with K'0 = 4.0.




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[Abstract] [Full Text] [PDF]


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