Pressure-dependent linewidth and Grüneisen parameter calculated from the soft Raman mode in zirconia Зависимость ширины линии и параметра Грюнайзена от давления, рассчитанная по мягкой моде комбинационного рассеяния света в диоксиде циркония
Condensed Matter and Interphases, cilt.28, sa.3, ss.363-375, 2026 (Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 28 Sayı: 3
- Basım Tarihi: 2026
- Doi Numarası: 10.17308/kcmf.2026.28/13820
- Dergi Adı: Condensed Matter and Interphases
- Derginin Tarandığı İndeksler: Scopus
- Sayfa Sayıları: ss.363-375
- Anahtar Kelimeler: Grüniesen parameter, Linewidth, Raman frequency, ZrO2
- Orta Doğu Teknik Üniversitesi Adresli: Evet
Özet
Objectives: The halfwidth at half maximum (HWHM or linewidth) of the soft Raman Eg mode at 260 cm-1 in Zirconia (ZrO2) was quantitatively interpreted as a function of pressure at room temperature using the Ising pseudospin-phonon coupled model predictions, namely the pseudospin-phonon coupled (PS) the energy fluctuation (EF) models. Experimental: The soft Raman Eg mode frequency, associated to the order parameter, is used to determine the inverse of relaxation time as a function of pressure in ZrO2. Furthermore, the activation energy calculation for ZrO2 was carried out from our obtained values of HWHM from both PS and EF models. Moreover, the temperature dependence of this Eg mode was predicted through the two models studied here. Finally, the volume-pressure phase diagram of zirconia from the literature was used to estimate the isothermal Grüinesen parameter of the Raman modes at 150, 260, 320, 480, 602, and 650 cm-1 of ZrO2 as a function of pressure. Conclusions: Our results indicate that both the PS and EF models adequately describe the increasing and decreasing behavior of the observed HWHM as a function of pressure and temperature, respectively for the soft Raman Eg mode in ZrO2