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07-12E

07-12E


By icmp_admin - Posted on 08 February 2012

UDC: 
53.096, 534-16, 536.2.01, 538.913
PACS: 
63.20.Dj, 65.40.Ba, 77.80.-e

On the issue of superstructure phase transitions in monoclinic RbD$_2$PO$_4$ crystal

Ya. Shchur

The paper presents the results of group-theory analysis and lattice dynamics simulation in three temperature phases of the monoclinic RbD$_2$PO$_4$. Combining the methods of group theory with the analysis of crystal structure peculiarities in different structural phases, it is shown that the lowest temperature phase should reveal a strict antiferroelectric state with P2$_1$ symmetry rather than the ferrielectric state reported repeatedly. Lattice dynamics simulation was performed in the quasi-phenomenological approach comprising the Coulomb, short range, covalent, van der Waals and hydrogen bonded interactions.

Year: 
2007
Pages: 
14
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