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High pressure
Items for "High pressure"
A comparative study of the anisotropy of lattice strain induced in the crystals of DL-serine by cooling down to 100 K, or by increasing pressure up to 8.6 GPa. A comparison with L-serine
The anisotropy of lattice strain in the crystals of DL-serine (P21/n) on cooling down to 100 K and with increasing hydrostatic pressure up to 8.6 GPa was studied by single-crystal X-ray diffraction...
Keywords: DL-serine, Hydrogen bonds, Amino acids, Low temperature, High pressure
02/2006 | Zeitschrift für Kristallographie, Oldenbourg WissenschaftsverlagStructure refinements of iron borides Fe2B and FeB
Crystals of the iron borides FeB and Fe2B were obtained from two different high temperature synthesis routes, viz. in combined copper/gallium flux and under high pressure conditions...
Keywords: Iron boride, Metal flux, High pressure, Single crystal structure analysis, X-ray diffraction
05/2006 | Zeitschrift für Kristallographie, Oldenbourg WissenschaftsverlagHigh-pressure crystal chemistry of binary intermetallic compounds
Effects of high pressure on intermetallic compounds are reviewed with regards to structural stability and phase transitions...
Keywords: High pressure, Binary intermetallic compounds, Crystal chemistry
05/2006 | Zeitschrift für Kristallographie, Oldenbourg WissenschaftsverlagCrystal structures of high-pressure phases in the alumina-water system: I. Single crystal X-ray diffraction and molecular dynamics simulation of η-Al(OH)3
The high-pressure phase of gibbsite has been studied by in situ single crystal X-ray diffraction method and molecular dynamics (MD) simulation at 3.0 GPa...
Keywords: Gibbsite, High pressure, Phase transition, Single crystal structure analysis, X-ray diffraction
01/2007 | Zeitschrift für Kristallographie, Oldenbourg WissenschaftsverlagCrystal structures of high-pressure phases in the alumina-water system: II. Powder X-ray diffraction study of a new dense aluminum deuteroxide, δ-Al(OD)3
In this study we report the solution of the structure of δ-Al(OD)3. The crystal structure was determined using powder X-ray diffraction and direct methods, while the positions of deuterium atoms were estimated by difference-Fourier methods and MEM/Rietveld analysis...
Keywords: Aluminum deuteroxide, A-site deficient hydroxy-perovskite, High pressure, Hydrogen bond, Powder diffraction structure analysis
01/2007 | Zeitschrift für Kristallographie, Oldenbourg WissenschaftsverlagEffect of hydrostatic pressure up to 6 GPa on the crystal structures of ammonium and sodium hexafluorosilicates, (NH4)2SiF6 and Na2SiF6; a phase transition in (NH4)2SiF6
An in situ X-ray powder diffraction study has shown the cubic modification of (NH4)2SiF6 (cryptohalite, space group Fm¯3m) at 0.2–0.3 GPa to transform irreversibly into the trigonal bararite, space group P¯3m1...
Keywords: Phase transitions, High pressure, Lattice strain, Bararite, Cryptohalite
01/2007 | Zeitschrift für Kristallographie, Oldenbourg WissenschaftsverlagOrientation relations between four phases of AgI
Starting with wurtzite-type single crystals, AgI was investigated at room temperature and pressures up to 0.5 GPa by means of a polarizing light microscope and with the precession technique...
Keywords: High pressure, Silver iodide, Phase transitions, Orientation relations, Diamond anvil cell
02/2007 | Zeitschrift für Kristallographie, Oldenbourg WissenschaftsverlagInterferometric Measurement of the Density of Aqueous Solutions under Ultra-High Hydrostatic Pressure
This contribution describes a densitometer that is based on a Jamin interferometer. It allows the investigation of transparent liquids at a pressure up to 5000bar...
Keywords: density measurement, High pressure, Jamin interferometer, Aqueous solutions
02/2007 | tm – Technisches Messen, Oldenbourg Wissenschaftsverlag