Fourth-order Mie-Grüneisen theory of the temperature variation of the bulk modulus and its first pressure derivative for cubic solids

Delannoy‐Coutris, M.; Perrin, G.

doi:10.1016/0167-6636(91)90050-a

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1997

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“…16 At room temperature the pressure points were: 1.4, 5.3, 8.5, 11.6, and 15.8 GPa ͑with 0.4 GPa uncertainty͒. The pressure points at liquid-nitrogen temperature were determined in the same way after correcting for ϳ9% increase in the bulk modulus of Ag at 77 K relative to 300 K. 17 The resulting pressure points at 77 K were ambient, 3.4, 4.3, 9, and 10.2 GPa ͑with 0.4 GPa uncertainty͒.…”

Section: Discussionmentioning

confidence: 99%

Local structural changes inKNbO3under high pressure

et al. 1997

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The local structure of the perovskite KNbO 3 at 77 and 300 K under high pressure, up to 15.8 GPa, has been investigated using the x-ray-absorption fine-structure ͑XAFS͒ technique. It is found that the local-structure symmetry does not change even though the average macroscopic crystal symmetry changes several times over this same temperature and pressure range. The existence of different local and macroscopic structures means that the local distortions from the average structure are disordered. Other unexpected results obtained from the XAFS measurements are evidence for a decreasing Nb-Nb displacement correlation length and a destabilization of the oxygen octahedra with increasing pressure.

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Section: Discussionmentioning

confidence: 99%