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The possibility of using X-ray diffraction to precisely monitor crystal structure at the extremes of pressure and temperature produced by shock-wave loading is explored. A summary of the advantages of using various X-ray sources for this work and an outline of the necessary experimental layout is given. [ABSTRACT FROM AUTHOR]

A novel sample chamber has been developed for the study of chemical reactions involving air sensitive samples using energy-dispersive powder diffraction. The apparatus consists of a reaction vessel, automatic reactant dispensing system, heating jacket, stirrer, and gas purge system. The use of this apparatus is illustrated with data collected on station 9.7 of the UK Synchrotron Radiation Source during a study on the intercalation of cobaltocene into tin disulfide. [ABSTRACT FROM AUTHOR]

A new data acquisition system tailored to the rapid collection of time-resolved powder diffraction data has been constructed. It is used for the study of structural phase transitions at the energy-dispersive powder diffraction facility of the UK synchrotron radiation source (SRS). The data acquisition system and some data collected during a study of the 196 °C phase transition in ammonium chloride are presented here. [ABSTRACT FROM AUTHOR]

The crystalline, liquid and amorphous phase stabilities and transformations of the Ge1Sb2Te4 (GST124) alloy are investigated as a function of pressure and temperature using synchrotron diffraction experiments in a diamond anvil cell. The results indicate that the solid-state amorphization of the cubic GST124 phase under high pressure may correspond to a metastable extension of the stability field of the GST124 liquid along a hexagonal crystal-liquid phase boundary with a negative P-T slope. The internal pressures generated during phase change are shown to be too small to affect phase stability. However, they may be important in understanding reliability issues related to thermomechanical stress development in phase change random access memory structures. [ABSTRACT FROM AUTHOR]