Deformation of periclase single crystals at high pressure and temperature: Quantification of the effect of pressure on slip-system activities

2012 ◽  
Vol 111 (11) ◽  
pp. 112607 ◽  
Author(s):  
Jennifer Girard ◽  
Jiuhua Chen ◽  
Paul Raterron
Keyword(s):  
High Pressure ◽  
Slip System ◽  
Single Crystals ◽  
High Pressure And Temperature ◽  
Effect Of Pressure

scholarly journals Ge0.57Ti0.43O2: a new high-pressure material with rutile-type crystal structure

2018 ◽  
Vol 74 (7) ◽  
pp. 1010-1012 ◽  
Author(s):  
Emil Stoyanov ◽  
Kurt Leinenweber ◽  
Thomas L. Groy ◽  
Abds-Sami Malik
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
High Pressure ◽  
Single Crystals ◽  
Structure Type ◽  
Site Symmetry ◽  
Rutile Structure ◽  
High Pressure And Temperature ◽  
Atom Position ◽  
Type Crystal

Single crystals of a GeO2–TiO2 solid solution with the corresponding composition Ge0.57Ti0.43O2 (germanium titanium tetraoxide) were obtained by devitrification of germania-titania glass at high pressure and temperature. The new compound crystallizes in the rutile structure type (space group P42/mnm), where Ge and Ti share the same position M (site symmetry m.mm), with occupancy values of 0.57 (3) and 0.43 (3), respectively, and one O-atom position (m.2m). The M site is in a sixfold O-atom coordination and, as in the original TiO2 rutile structure, an elongation of the O—M—O bonds along the c-axis direction of the coordination polyhedron and deviation of the angles from 90° lead to a decrease in the coordination symmetry from octahedral to tetragonal. The Ge and Ti atoms are fully disordered in the structure, which indicates that the rutile structure is surprisingly pliant given the differing sizes of the two cations.

scholarly journals Effect of High Pressure and Temperature on the Evolution of Si Phase and Eutectic Spacing in Al-20Si Alloys

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 705
Author(s):  
Rong Zhang ◽  
Chunming Zou ◽  
Zunjie Wei ◽  
Hongwei Wang
Keyword(s):  
High Pressure ◽  
Volume Change ◽  
High Pressure And Temperature ◽  
Average Spacing ◽  
Lamellar Eutectic ◽  
Eutectic Spacing ◽  
Effect Of Pressure ◽  
Superheat Temperature ◽  
Spacing Variation ◽  
Al Matrix

The microstructure of the Si phase in Al-20Si alloys solidified under high pressure was investigated. The results demonstrate that the morphology of Si phase transformed (bulk→short rod→long needle) with the increase of superheat temperature under high pressure. At a pressure of 3 GPa and a superheat temperature of 100 K, a microstructure with a uniform distribution of fine Si phases on the α-Al matrix was obtained in the Al-20Si alloy. In addition, a mathematical model was developed to analyze the spacing variation of the lamellar Al-Si eutectics under the effect of pressure. The lamellar Al-Si eutectics appeared at 2 GPa and superheat temperatures of 70–150 K, and at 3 GPa and superheat temperatures of 140–200 K. With the increase of pressure from 2 GPa to 3 GPa, the average spacing of lamellar Al-Si eutectics decreased from 1.2–1.6 μm to 0.9–1.1 μm. In binary alloys, the effect of pressure on the eutectic spacing is related to the volume change of the solute phase from liquid to solid. When the volume change of the solute phase from liquid to solid is negative, the lamellar eutectic spacing decreases with increasing pressure. When it is positive, the eutectic spacing increases with increasing pressure.

Properties of CaB6 single crystals synthesized under high pressure and temperature

2011 ◽  
Vol 54 (10) ◽  
pp. 1791-1795 ◽  
Author(s):  
ShengWei Xin ◽  
ShaoCun Liu ◽  
ZhiSheng Zhao ◽  
JianQing Yang ◽  
Bo Xu ◽  
...  
Keyword(s):  
High Pressure ◽  
Single Crystals ◽  
High Pressure And Temperature

Formation and properties of SrB6 single crystals synthesized under high pressure and temperature

2011 ◽  
Vol 509 (30) ◽  
pp. 7927-7930 ◽  
Author(s):  
Shengwei Xin ◽  
Shaocun Liu ◽  
Nan Wang ◽  
Xianyue Han ◽  
Limin Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
Single Crystals ◽  
High Pressure And Temperature

scholarly journals Chemical Stability of FeOOH at High Pressure and Temperature, and Oxygen Recycling in Early Earth History

2021 ◽  
Author(s):  
Egor Koemets ◽  
Timofey Fedotenko ◽  
Saiana Khandarkhaeva ◽  
Maxim Bykov ◽  
Elena Bykova ◽  
...  
Keyword(s):  
High Pressure ◽  
Chemical Stability ◽  
Early Earth ◽  
High Pressure And Temperature ◽  
Earth History

scholarly journals Single Crystal Growth and Physical Properties of Pyroxene CoGeO3

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 378
Author(s):  
Li Zhao ◽  
Zhiwei Hu ◽  
Hanjie Guo ◽  
Christoph Geibel ◽  
Hong-Ji Lin ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Crystal Growth ◽  
Physical Properties ◽  
Single Crystal ◽  
Single Crystals ◽  
Magnetic Moments ◽  
Single Crystal Growth ◽  
The Impact

We report on the synthesis and physical properties of cm-sized CoGeO3 single crystals grown in a high pressure mirror furnace at pressures of 80 bar. Direction dependent magnetic susceptibility measurements on our single crystals reveal highly anisotropic magnetic properties that we attribute to the impact of strong single ion anisotropy appearing in this system with TN∼33.5 K. Furthermore, we observe effective magnetic moments that are exceeding the spin only values of the Co ions, which reveals the presence of sizable orbital moments in CoGeO3.

Sign in / Sign up

Export Citation Format

Share Document