Soft mode theory of ferroelectric phase transitions in the low-temperature phase

Using the Extended X-ray Absorption Fine Structure (EXAFS) technique, we have investigated the local structure of disordered PbSxTe1−x and ZnxCd1−xTe alloys at temperatures below and above the reported ferroelectric transition temperatures. For the PbSxTe1−x alloys (x=0.10, 0.18, and 0.30), the sulphur ions are found to be off-center in both the high and the low temperature phase and Pb sublattice and Te sublattice shift relative to one another below the transition temperature. For ZnxCd1−xTe alloys (x=0.10 and 0.20), the zinc ions are found in a slightly asymmetric site in the cages formed by four NN Te ions and no relative shift between the cation and anion sublattice is observed. We discuss our results concerning the ferroelectric phase transitions (FPT) induced by off-center ions in these two systems.

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X-ray study of the low-temperature phase transitions in LiKSO4

Phase Transitions ◽

10.1080/01411598308218845 ◽

1983 ◽

Vol 4 (1) ◽

pp. 37-45 ◽

Cited By ~ 77

Author(s):

P. E. Tomaszewski ◽

K. Łukaszewicz

Keyword(s):

Phase Transitions ◽

Low Temperature ◽

Temperature Phase ◽

X Ray ◽

Low Temperature Phase

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Low-temperature phase transitions in β-Ca3(PO4)2 and related compounds

Journal of Physics and Chemistry of Solids ◽

10.1016/0022-3697(59)90055-1 ◽

1959 ◽

Vol 11 (1-2) ◽

pp. 172-173 ◽

Cited By ~ 27

Author(s):

H. Koelmans ◽

J.J. Engelsman ◽

P.S. Admiraal

Keyword(s):

Phase Transitions ◽

Low Temperature ◽

Temperature Phase ◽

Related Compounds ◽

Low Temperature Phase

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SHG Microscopic Studies on Low Temperature Phase Transitions of SrTi 16 O 3 and SrTi 18 O 3

Ferroelectrics ◽

10.1080/00150190390205834 ◽

2003 ◽

Vol 285 (1) ◽

pp. 19-26 ◽

Cited By ~ 7

Author(s):

Yoshiaki Uesu ◽

Ryuhei Nakai ◽

Noritaka Kato ◽

Carole Menoret ◽

Jean-Michel Kiat ◽

...

Keyword(s):

Phase Transitions ◽

Low Temperature ◽

Temperature Phase ◽

Microscopic Studies ◽

Low Temperature Phase

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Low-temperature phase transitions and dynamics of ammonium in (NH4)3H(SO4)2 and [(NH4)1−x Rbx]3H(SO4)2 crystals

Physics of the Solid State ◽

10.1134/1.1340197 ◽

2001 ◽

Vol 43 (1) ◽

pp. 117-126 ◽

Cited By ~ 7

Author(s):

L. S. Smirnov ◽

A. I. Baranov ◽

L. A. Shuvalov ◽

L. Bobrowicz-Sarga ◽

I. Natkaniec ◽

...

Keyword(s):

Phase Transitions ◽

Low Temperature ◽

Temperature Phase ◽

Low Temperature Phase

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Raman study of low temperature phase transitions in the cubic perovskite CH3NH3PbCI3

Phase Transitions ◽

10.1080/01411599808207997 ◽

1998 ◽

Vol 64 (4) ◽

pp. 179-190 ◽

Cited By ~ 20

Author(s):

A. Maaej ◽

M. Bahri ◽

Y. Abid ◽

N. Jaidane ◽

Z. B. Lakhdar ◽

...

Keyword(s):

Phase Transitions ◽

Low Temperature ◽

Temperature Phase ◽

Raman Study ◽

Low Temperature Phase

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Single-Crystal X-Ray Scattering Study of Superstructures and Phase Transitions in Graphite-Hno3 and Graphite-Br2 Intercalation Compounds

MRS Proceedings ◽

10.1557/proc-20-27 ◽

1982 ◽

Vol 20 ◽

Cited By ~ 5

Author(s):

R. Moret ◽

R. Comes ◽

G. Furdin ◽

H. Fuzellier ◽

F. Rousseaux

Keyword(s):

Phase Transitions ◽

Low Temperature ◽

Room Temperature ◽

Temperature Phase ◽

Temperature Structure ◽

X Ray ◽

X Ray Scattering ◽

Scattering Study ◽

Temperature Liquid ◽

Low Temperature Phase

ABSTRACTIn α-C5n-HNO3 the condensation of the room-temperature liquid-like diffuse ring associated with the disorder-order transition around 250 K is studied and the low-temperature. superstructure is examined.It is found that β-C8n-HNO3 exhibits an in-plane incommensurate order at room temperature.Two types of graphite-Br2 are found. Low-temperature phase transitions in C8Br are observed at T1 ≍ 277 K and T2 ≍ 297 K. The room-temperature structure of C14Br is reexamined. Special attention is given to diffuse scattering and incommensurability.

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