Dipole effects in AWO(4) (A = Pb, Cd) luminescent crystals

作者：Shevchuk V N; Kayun I V^*

来源：Radiation Measurements, 2007, 42(4-5): 847-850.

DOI：10.1016/j.radmeas.2007.02.038

• lead and cadmium tungstates
• permittivity
• thermostimulated depolarization
• point defect

Temperature dependences of permittivity (e) at a frequency of 1 kHz and thermostimulated depolarization (TSD) current were studied for undoped AWO(4) (A = Pb, Cd) single crystals in a temperature range of T = 290-550 K. Two series of TSD maxima were observed in the 290-350 and 380-550K ranges. In the case of previously polarized PbWO4 crystals, the e(T) curve maximum was observed at. about 320K. The results obtained indicate that in the AWO(4) crystals the active ion-electron processes are realized. These processes are in particular caused by dipole associates and isolated electrical active defects and by charge carriers exchange between them. The characteristics of PbWO4 and CdWO4 are compared.

• 出版日期2007-5