Transport properties of ferroelectric (lead titanate) doped zinc - borate glasses

Abstract

Ferroelectric doped zinc-borate glasses of the composition (1-x) [40 ZnO-60 B₂O₃] + x PbTiO₃ with <i><img src='/image/spc_char/lembda.gif' border=0></i>= 0,0.05,0.1,0.15 ,0.2 were prepared. Physical properties such as density (<i>d</i>), molar volume (<i>V</i>), hopping distance (<i>R</i>), number of zinc ions per cc (<i>N</i>), and polaron radius (<i>r_p</i>)<i> </i>were reported. DC-conductivity was measured between 443 K to 573 K. From this, two graphs (a) -log σ versus 1/<i>T </i>and (b)- log μ versus 1/<i>T </i>were plotted. Activation energy <i>W </i>was determined from the plots. Effect of ferroelectric doping on the hopping conduction was studied. Polaron bandwidth (<i>J</i>)<i> </i>was found to satisfy the inequality for all samples thus suggesting adiabatic hopping conduction mainly governed by the activation energy.