Stability of magnesite and its high-pressure form in the lowermost mantle

Nature ◽  
2004 ◽  
Vol 427 (6969) ◽  
pp. 60-63 ◽  
Author(s):  
Maiko Isshiki ◽  
Tetsuo Irifune ◽  
Kei Hirose ◽  
Shigeaki Ono ◽  
Yasuo Ohishi ◽  
...  
Keyword(s):  
High Pressure ◽  
Pressure Form ◽  
Lowermost Mantle

Crystal and powder XRD data of Mg3(PO4)2-III: High-temperature and high-pressure form

1995 ◽  
Vol 10 (4) ◽  
pp. 293-295 ◽  
Author(s):  
F. Brunet ◽  
C. Chopin ◽  
A. Elfakir ◽  
M. Quarton
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
High Temperature ◽  
Single Crystal ◽  
Diffraction Pattern ◽  
Structure Refinement ◽  
Powder Xrd ◽  
Single Crystal Structure ◽  
Crystal Structure Refinement ◽  
Pressure Form

A new diffraction pattern of the high-temperature and high-pressure polymorph Mg3(PO4)2-III (PDF 43-500) is given and indexed on the basis of a single-crystal structure refinement. It allows diffractogram indexing of the isostructural high-temperature and high-pressure form of Co3(PO4)2 (PDF 43-499).

High-Resolution Electron Microscopy Studies of Faults and Intergrowth in Nb3O7F

1990 ◽  
Vol 183 ◽  
Author(s):  
Lotta permér ◽  
Monica Lundberg
Keyword(s):  
Electron Microscopy ◽  
Thermal Decomposition ◽  
High Pressure ◽  
High Resolution Electron Microscopy ◽  
Two Dimensions ◽  
Resolution Electron ◽  
Shear Type ◽  
Pressure Form ◽  
The Common ◽  
Shear Planes

AbstractHREM studies of the low-pressure form of Nb3O7F, obtained by thermal decomposition of NbO2F or by reacting stoichiometric amounts of NbO2F and Nb2O5, confirmed that the crystals are built up of a shear-type structure in which slabs of ReO3 type, infinite in two dimensions and three octahedra wide, separate the shear planes. Most of the crystals were well-ordered, although faults could occasionally be detected. However, some crystals were found to be intergrown with a structure closely related to the high-pressure form of Nb3O7F. The latter structure is composed of wavy rows of edge-sharing NbX7 pentagonal bipyramids, joined to each other by NbX6 octahedra. The connection between the two atomic arrangements can be understood in terms of the common c-axes and a slight distortion of the polyhedra along the boundary.

A new high-pressure form of MgAl2O4

Nature ◽  
1991 ◽  
Vol 349 (6308) ◽  
pp. 409-411 ◽  
Author(s):  
T. Irifune ◽  
K. Fujino ◽  
E. Ohtani
Keyword(s):  
High Pressure ◽  
Pressure Form

High-pressure form of pyrite-type germanium dioxide

2003 ◽  
Vol 68 (1) ◽  
Author(s):  
Shigeaki Ono ◽  
Taku Tsuchiya ◽  
Kei Hirose ◽  
Yasuo Ohishi
Keyword(s):  
High Pressure ◽  
Germanium Dioxide ◽  
Pressure Form

Synthesis and structure of a new high-pressure form of Rh2O3

1970 ◽  
Vol 2 (1) ◽  
pp. 134-136 ◽  
Author(s):  
R.D. Shannon ◽  
C.T. Prewitt
Keyword(s):  
High Pressure ◽  
Pressure Form
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