EPR investigation of VO2+ and Cu2+ ions doped R2O+P2O5+ZnO+CaO glassy systems (R = Na and K)

---

Atıf İçin Kopyala

Fidan M.

TFD 27. Uluslararası Fizik Kongresi, Malatya, Türkiye, 4 - 07 Eylül 2007, ss.110-111

• Yayın Türü: Bildiri / Özet Bildiri
• Basıldığı Şehir: Malatya
• Basıldığı Ülke: Türkiye
• Sayfa Sayıları: ss.110-111
• Atatürk Üniversitesi Adresli: Evet

Özet

 

Electron paramagnetic resonance (EPR) and optical absorption spectra of VO²⁺ and Cu²⁺ ions separately in 15R₂SO₄+50NH₄H₂PO₄+(25-x)ZnSO₄.7H₂O+10CaSO₄.2H₂O glassy system have been studied (x = 0.25, 0.50,…,2.00 and R=Na and K). The EPR spectra consist of eight hyperfine lines characteristics of VO²⁺ ions. EPR spectra of all the glassy samples exhibit resonance signals characteristics of Cu²⁺ ions. From the observed spectra the spin-Hamiltonian parameters have been evaluated. The measured values of spin-Hamiltonian parameters g and A for VO²⁺ ions indicate that VO²⁺ ions in glassy system were present in octahedral sites with tetragonal compression. For Cu²⁺ ions, the values of spin-Hamiltonian parameters indicate that Cu²⁺ ions in glassy system have octahedral coordination with a tetragonal distortion.

 

By using the EPR data and transition energies obtained from the optical absorption spectra of all the glassy samples, the molecular orbital coefficients have been evaluated.