Influence of Nb2O5 addition on dielectric properties and diffuse phase transition behavior of BaZr0.2Ti0.8O3 ceramics
Source abstract
Abstract
Abstract Nb 2 O 5 doped Ba(Zr 0.2 Ti 0.8 )O 3 (short as BZT20) ceramics were prepared by a mixed-oxide method using a high-energy planetary ball mill and the influence of Nb 2 O 5 addition on microstructure, dielectric properties and diffuse phase transition behavior of BZT20 ceramics were investigated. It was demonstrated that Nb 5+ entered the B-site of BZT20 ceramic and substituted for Ti 4+ , which caused the expansion and distortion of crystal lattice. BZT20 ceramics doped with 0.2 mol% Nb 2 O 5 showed excellent dielectric property and lower diffusivity with e m =37,823 and γ =1.49. We supposed that the increase of dielectric constant and decrease of diffuseness parameter with increasing Nb 2 O 5 content were caused by lattice disorder and unbalancing of cations induced by the substitution of Ti 4+ by Nb 5+ in the B sites of BZT20 ceramics. The Curie temperature decreased with the increase of Nb 2 O 5 content, which can be attributed to enlarged distortion energy of the Nb doped BZT20 structure. Besides, grain size effect on the dielectric property and diffuse phase transition behavior of Nb 2 O 5 doped BZT20 ceramics was also investigated.
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Research context
OpenAlex topics: Ferroelectric and Piezoelectric Materials · Microwave Dielectric Ceramics Synthesis · Multiferroics and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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