Spectroscopic modifications of Pippard relations: Tricritical phase transition in NH4Cl

Yurtseven, H.; Eraslan, Funda

doi:10.1016/j.jqsrt.2006.02.031

Spectroscopic modifications of Pippard relations: Tricritical phase transition in NH4Cl

Yurtseven H., Eraslan F.

Journal of Quantitative Spectroscopy and Radiative Transfer, cilt.102, sa.3, ss.513-518, 2006 (SCI-Expanded, Scopus)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 102 Sayı: 3
Basım Tarihi: 2006
Doi Numarası: 10.1016/j.jqsrt.2006.02.031
Dergi Adı: Journal of Quantitative Spectroscopy and Radiative Transfer
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Sayfa Sayıları: ss.513-518
Anahtar Kelimeler: NH4Cl, Pippard relations, Raman modes
TED Üniversitesi Adresli: Hayır

Özet

We study here the Pippard relations modified spectroscopically for the NH4Cl crystal. By relating the specific heat CP to the frequency shift (1 / ν) (∂ ν / ∂ T)P for the disorder-allowed Raman modes of ν7 (93 cm-1) and ν5 (144 cm-1) in NH4Cl close to the tricritical point (P=1.6 kbar, TC=257 K), we show that the first Pippard relation is valid for this crystalline system. © 2006 Elsevier Ltd. All rights reserved.