Contents Menu

Phase transitions in the mixed crystals LiRb_<1-x>(NH_4)_xSO_4

Ferroelectrics Volume 105 Issue 1 Page 279-284
published_at 1990
Title
Phase transitions in the mixed crystals LiRb_<1-x>(NH_4)_xSO_4
Creators Kawamura K.
Creators Kuramashi A.
Creators Nakamura H.
Creators Kasano H.
Creators Mashiyama H.
Creators Nakanishi S.
Creators Itoh H.
The successive phase transitions of mixed crystal systems of LiRbSO_4-LiNH_4SO_4 were studied by X-ray diffraction, dielectric measurement, thermal analysis and SHG detection as functions of temperature and ammonium concentration x. Although the ammonium ion is almost of the same size as the rubidium ion, a small amount of ammonium reduces the transition temperatures and the incommensurate and the fivefold commensurate phases of LiRbSO_4 fade out for x>0.1. With further replacing rubidium by ammonium, the antiferroelectric phase of LiRbSO_4 does not appear and the phase sequence is similar to LiNH_4SO_4 for x>0.25. The phase diagram and the modulated structure are discussed in reference to an Ising model with long range interactions.
Languages eng
Resource Type journal article
Publishers Taylor and Francis
Date Issued 1990
File Version Not Applicable (or Unknown)
Access Rights metadata only access
Relations
[ISSN]0015-0193
[NCID]AA00644949
https://doi.org/10.1080/00150199008224655
[isPartOf] [URI]http://www.tandf.co.uk/journals/titles/00150193.asp
Schools 大学院理工学研究科(理学)