Dielectric dispersions and impedance characteristics of LiYF4 single crystal

We have grown the LiYF4 single crystal using the Czochralski technique in A r-gas atmosphere. The measurements of complex dielectric constants and comp lex impedances are carried out in the range of 100 Hz similar to 10 MHz and up to 200 degrees C for c-plate of LiYF4 single crystal. LiYF4 reveals the strong low frequency dielectric dispersion below 300 kHz from room tempera ture to 200 degrees C. It is believed that the strong dielectric dispersion is related to the ionic hopping conduction which arises mainly from the ju mping of Li+-ions between neighboring sites. The conduction mechanism seems to be the non-interacting Debye type and the relaxation times satisfy the Arrhenius relation. The activation energy concerned with hopping conduction is Delta=0.49 eV.