Polar and nonpolar atomic motions in the relaxor ferroelectric Pb1-3x/2LaxZr0.2Ti0.8O3 from dielectric, anelastic, and NMR relaxation
PHYSICAL REVIEW B, cilt.71, sa.9, 2005 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 71 Sayı: 9
- Basım Tarihi: 2005
- Doi Numarası: 10.1103/physrevb.71.094112
- Dergi Adı: PHYSICAL REVIEW B
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- Hacettepe Üniversitesi Adresli: Hayır
Özet
Dielectric, anelastic, and La-139 NMR relaxation measurements have been made on the relaxor ferroelectric Pb1-3x/2La.Zr0.2Ti0.8O3 (PLZT) with x=0.22. The dielectric susceptibility exhibits the frequency dispersive maximum due to the freezing of the polar degrees of freedom around T 250 K. The anelastic and especially NMR relaxation, besides this maximum, indicate an intense and broad component at lower temperatures, attributed to rotational modes of the O octahedra, weakly coupled to the polar modes. It is discussed why such short range rotational instabilities, known to occur in the Zr-rich rhombohedral region of the PLZT phase diagram, might appear also in the Ti-rich region.