Details

Autor(en) / Beteiligte

• CiŻman, A.
• Poprawski, R.
• Sieradzki, A.

Titel

Ferroelectric phase transition in (CH3NH3)5Bi2Cl11 and (CH3NH3)5Bi2Br11 crystals

Ist Teil von

• Phase transitions, 2007-01, Vol.80 (1-2), p.171-176

Ort / Verlag

Taylor & Francis Group

Erscheinungsjahr

2007

Quelle

Taylor & Francis 数据库

Beschreibungen/Notizen

• Temperature dependence of the linear birefringence Δn and excess entropy ΔS in a phase transitions regions are presented for the (CH 3 NH 3 ) 5 Bi 2 Cl 11 and (CH 3 NH 3 ) 5 Bi 2 Br 11 ferroelectric crystals. We have confirmed that there is a linear relation between Δn and ΔS in the temperature range from 285 to 306 K and from 295 to 306 K for (CH 3 NH 3 ) 5 Bi 2 Cl 11 and (CH 3 NH 3 ) 5 Bi 2 Br 11 crystals, respectively. Our results imply that relation between the linear birefringence and excess entropy can be described by Landau theory.