Raman linewidths calculated as a function of temperature in NaNO(2)

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Atıf İçin Kopyala

KARACALİ H., YURTSEVEN H. H., Kiraci A.

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, cilt.246, sa.5, ss.1124-1131, 2009 (SCI-Expanded)

• Yayın Türü: Makale / Tam Makale
• Cilt numarası: 246 Sayı: 5
• Basım Tarihi: 2009
• Doi Numarası: 10.1002/pssb.200844382
• Dergi Adı: PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
• Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
• Sayfa Sayıları: ss.1124-1131
• Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

The temperature dependence of the damping constant is calculated for some Raman modes in NaNO(2) using the soft mode-hard mode coupling model and the energy fluctuation model. The damping constant is fitted to the measured Raman bandwidths of those modes, which is well described by the soft mode-hard mode coupling model. The values of the activation energy are extracted from the damping constant for the Raman modes, which are much greater than k(B)T(C) = 0.04 eV for NaNO(2) close to the transition temperature (T(C) = 436 K). This is an indication that NaNO(2) undergoes an order-disorder phase transition. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim