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Determination of the Transition Pressures of Some Alkali Halides under Hydrostatic Pressure with X-Ray Diffraction Method

  • M. Nomura
  • Y. Yamamoto
  • N. Nakagiri
  • Y. Shirai
  • H. Fujiwara

Abstract

Although many reports have been presented concerning the polymorphic transition pressures of alkali halides, there have been few reliable studies with respect to the hysteresis phenomena. Recently Lacam and Peyronneau [1] observed the definite hysteresis loops of several rubidium halides Controlling such conditions as purity of the specimen, heat treatment, and pressurization rates. For the potassium halides, on the other hand, which have higher transition pressures [2] than those of rubidium halides, no reliable hysteresis loop was reported. Mizouchi [3] measured the transition pressures of potassium chloride as a test of his new pressure apparatus both in compression and decompression runs, but his result is unlikely to be regarded as a hysteresis loop. In order to explain the hysteresis phenomena, therefore, the lattice constants of the potassium halides were measured using the x-ray diffraction technique at pressures including the phase transition. The specimens studied were KCl, KI, KBr, and KF.

Keywords

Hysteresis Loop Hydrostatic Pressure Diffraction Line Sample Chamber Transition Pressure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1979

Authors and Affiliations

  • M. Nomura
    • 1
  • Y. Yamamoto
    • 1
  • N. Nakagiri
    • 1
  • Y. Shirai
    • 1
  • H. Fujiwara
    • 1
  1. 1.Hiroshima UniversityHiroshimaJapan

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