PHASE-TRANSITIONS IN TRIRUBIDIUM HYDROGEN DISELENATE RB3H(SEO4)2

It has been shown that Rb3H(SeO4)2 undergoes successive phase transitions at 178°C and 302°C by the DTA analysis. The dielectric behavior is quite similar to that in Rb3H(SO4)2 in a range from room temperature to liquid nitrogen temperature. In Rb3H(XO4)2 (X=S, Se) system a corresponding relation between the phases can be recognized in contrast to (NH4)3H(XO4)2 system. © 1979, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.