Phase transition in Cu2+-doped RbH2 PO4 as observed by EPR


Demir D., Köksal F., KÖSEOĞLU R.

RADIATION EFFECTS AND DEFECTS IN SOLIDS, cilt.164, ss.276-278, 2009 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 164 Konu: 4
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1080/10420150902831290
  • Dergi Adı: RADIATION EFFECTS AND DEFECTS IN SOLIDS
  • Sayfa Sayıları: ss.276-278

Özet

The electron paramagnetic resonance (EPR) spectra of Cu2+-doped RbH2 PO4 at elevated temperatures indicate a phase transition at 358K. The EPR-silent state at this temperature is attributed to a so-called polymeric phase transition. After the transition when the temperature is lowered to 293K, the EPR signal does not appear; therefore, the transition is irreversible. This result seems to be in agreement with the other observations. The EPR spectra for the sample indicate the presence of two sites for Cu2+, and the values of EPR parameters are in accord with the literature on Cu2+-doped single crystals. Any other phase transitions could not to be observed at low temperatures down to 113K.