Title :
Dielectric properties of Fe3+ doped Bi1.5ZnNb1.5O7 ceramics
Author :
Qian Zhang ; Shihua Ding ; Tianxiu Song ; Zhuowei Zeng ; Peng Xiao
Author_Institution :
Sch. of Mater. Sci. & Eng., Xihua Univ., Chengdu, China
Abstract :
The structure and dielectric properties of Bi2O3-ZnO-Nb2O5(BZN) pyrochlore ceramics doped with Fe3+ were investigated. The crystal structure of (Bi1.5Zn0.5)(Zn0.5Nb1.5-xFex)O7 (BZNF) ceramics is cubic pyrochlore structure (α-BZN) when x ≤ 0.1 mol and the second phase occurs at x = 0.135 mol. The lattice parameter increases with increasing Fe. When x ≤ 0.1 mol the dielectric constant decreases and the dielectric loss increases. All the compositions exhibit a typical relaxation behavior. The modified Curie-Weiss law is used to characterize the dielectric relaxation. With an increase in Fe concentration the Tm shifts towards lower temperature, the bond lengths of RA-O and RB-O slightly increase and the ξ fractional coordinate of O decreases until x = 0.135 mol, meanwhile the bond valence sum AV (O) decrease.
Keywords :
bismuth compounds; ceramics; crystal structure; dielectric losses; dielectric relaxation; doping profiles; lattice constants; permittivity; zinc compounds; Bi1.5ZnNb1.5O7:Fe; Fe concentration; Fe3+ doped pyrochlore ceramics; bond lengths; bond valence; crystal structure; cubic pyrochlore structure; dielectric constant; dielectric loss; dielectric properties; dielectric relaxation; fractional coordinate; lattice parameter; modified Curie-Weiss law; second phase; structure properties; Ceramics; Chemistry; Dielectric constant; Iron; Solids; Temperature; Cubic pyrochlore; bond valence sum; relaxation behavior; the ζ fractional coordinate of O;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TDEI.2015.7116329
