Raman Scattering Study of the Phase Transitions in (NH4)2Cd2(SO4)3

  • J. C. Galzerani
  • R. S. Katiyar
Conference paper
Part of the Springer Series in Optical Sciences book series (SSOS, volume 26)


Di-ammonium di-cadmium sulfate (CAS) belongs to the langbeinite structure, with space group T4 containing four formula units in the primitive cell [1,2]. JONA and PEPINSKY [3] were the first to discover the existence of a phase transition in this crystal. The low-frequency dielectric studies by OSHIMA and NAKAMURA [4] showed that ε(0) remains practically constant from room temperature to about 95 K, where it suddenly jumps to a higher value, which decreases exponentially on lowering the temperature further. The sudden jump in ε(0) is accompanied by a paraelectric-ferroelectric phase transition with the appearance of a constant spontaneous polarization [5]. For these reasons, CAS is known as an improper ferroelectric.


Structural Phase Transition Ferroelectric Phase Sudden Jump Soft Zone Ferroelectric Transition 
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-Verlag Berlin Heidelberg 1981

Authors and Affiliations

  • J. C. Galzerani
    • 1
  • R. S. Katiyar
    • 1
  1. 1.Instituto de Física “Gleb Wataghin”Universidade Estadual de CampinasCampinasBrazil

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