High‐pressure and high‐temperature crystal chemistry of beryllium oxide

1986 ◽  
Vol 59 (11) ◽  
pp. 3728-3733 ◽  
Author(s):  
R. M. Hazen ◽  
L. W. Finger
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Crystal Chemistry ◽  
Beryllium Oxide

Crystal chemistry of Eu-bearing tuite synthesized at high-pressure and high-temperature conditions

2018 ◽  
Vol 46 (2) ◽  
pp. 157-163
Author(s):  
Shuangmeng Zhai ◽  
Hexiong Yang ◽  
Weihong Xue ◽  
Eugene Huang ◽  
Daisuke Yamazaki ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Crystal Chemistry ◽  
Temperature Conditions

Crystal chemistry of anion-excess ReO3-related phases. III.

2014 ◽  
Vol 70 (8) ◽  
pp. 742-748 ◽  
Author(s):  
Jean-Paul Laval
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
High Temperature ◽  
Crystal Chemistry ◽  
Three Dimensional ◽  
Structure Type ◽  
Ionic Structure ◽  
Zirconium Tetrafluoride

The crystal structure of the high-pressure (4–8 GPa) form of zirconium tetrafluoride, γ-ZrF4, is based on the association by corner- and edge-sharing of ZrF8triangulated dodecahedra, forming a three-dimensional framework. It presents some analogies with high-temperature α-ZrF4but clearly constitutes a newMX4structure type. The mainMX4ionic structure types, and especially those deriving from the `anion-excess ReO3-type', are compared and it is shown that the TeF4structure can also be included in this family.

Microstructural Study of Diamond Deformed Under High Pressure and Temperature

1985 ◽  
Vol 43 ◽  
pp. 230-231
Author(s):  
E. F. Koch
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Lattice Structure ◽  
Diamond Particle ◽  
Polycrystalline Diamond ◽  
Sintering Process ◽  
Ion Milling ◽  
Sintered Compact ◽  
Transmission Electron ◽  
High Pressure Sintering

Because of the extremely rigid lattice structure of diamond, generating new dislocations or moving existing dislocations in diamond by applying mechanical stress at ambient temperature is very difficult. Analysis of portions of diamonds deformed under bending stress at elevated temperature has shown that diamond deforms plastically under suitable conditions and that its primary slip systems are on the ﹛111﹜ planes. Plastic deformation in diamond is more commonly observed during the high temperature - high pressure sintering process used to make diamond compacts. The pressure and temperature conditions in the sintering presses are sufficiently high that many diamond grains in the sintered compact show deformed microtructures.In this report commercially available polycrystalline diamond discs for rock cutting applications were analyzed to study the deformation substructures in the diamond grains using transmission electron microscopy. An individual diamond particle can be plastically deformed in a high pressure apparatus at high temperature, but it is nearly impossible to prepare such a particle for TEM observation, since any medium in which the diamond is mounted wears away faster than the diamond during ion milling and the diamond is lost.

YSS YXM4

Alloy Digest ◽  
2019 ◽  
Vol 68 (11) ◽  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Physical Properties ◽  
Tool Steel ◽  
High Speed ◽  
Temperature Performance

Abstract YSS YXM4 is a cobalt-alloyed molybdenum high-speed tool steel with resistance to abrasion, seizure, and deformation under high pressure. This datasheet provides information on composition, physical properties, and hardness. It also includes information on high temperature performance. Filing Code: TS-780. Producer or source: Hitachi Metals America, Ltd.

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