High-Temperature Phase Transition In Rbh2Po4, Kd2P04 And Kh2Aso4

Y. Shapira, S. Levin, D. Gerlich

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The high-temperature phase transition in single crystals of RbHzP04 (RDP), KDzP04 (DKDP) with different levels of deuteration, and KH2As04 (KDA), has been investigated by measurements of the dielectric constant, electrical conductivity and 1R reflectivity, in the temperature range 300-500° K. RDP and KDP with a deuterium concentration higher than 74%, show a proper high-temperature phase transition, associated with crystalline structural change. For RDP, the transition temperature varies between 345-375“K, depending strongly on crystalline perfection, while for DKDP, the transition temperature decreases linearly from 453° K with increasing concentration of deuterium. For DKDP with a deuterium level lower than 74%, the transition temperature is constant at 453“K, and the transition is probably connected with the emission of water vapour. No transition is detected in the case of KDA.

Original languageEnglish
Pages (from-to)459-464
Number of pages6
Issue number1
StatePublished - 1 Jan 1977


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