Crystallization kinetics and dielectric properties of nanocrystalline lead strontium barium niobates

Abstract

The crystallization kinetics and phase developments of PbO–BaO–SrO–Nb2O5–B2O3–SiO2-based glass-ceramics was investigated. Lead strontium barium niobate, (Pb,Sr,Ba)Nb2O6, with a tetragonal tungsten-bronze structure formed as the major crystalline phase, which showed evidence of both surface and bulk crystallization. The results of the present study showed significant evidence of a change in crystallization mechanism between the as-heated surface and the interior of glass-ceramics. This effect could be attributed to a volatilization of PbO taken place readily on the surface region of sample during heating. The grain size of the bulk-nucleated (Pb,Sr,Ba)Nb2O6 crystals was substantially smaller than that of surface-nucleated crystals. This result facilitated meeting the capacitors as high energy density application due to the ultrafine grains (<60 nm) obtained. The dielectric constant increased from 27 for the as-quenched glass to 200 for a highly crystallized glass-ceramic, which was attributed to a significant volume fraction of (Pb, Sr, Ba) Nb2 O6 phase.

Improved discharged property for (BaO, Na2O)–Nb2O5–SiO2 glass-ceramics by La2O3 addition

“…In the field of ferroelectric glass-ceramic materials, a large number of studies are focused on the niobate glass-ceramic system, different types of ferroelectric glass-ceramic systems such as (PbO, Na 2 O)-Nb 2 O 5 [9], (SrO, BaO)-Nb 2 O 5 [10,11], (PbO, SrO, BaO)-Nb 2 O 5 [12] glass-ceramics, have been investigated widely. However, most of these materials containing lead, are harmful to the environment, which limits their wide application.…”

Comparative properties of Sr x Ba1−x TiO3 ferroelectric glass–ceramics prepared by powder sintering and melt casting

“…Much attention has recently been paid to a variety of ferroelectric glass-ceramics, such as (Ba,Sr)TiO 3 , (Ba,Sr)Nb 2 O 6 , and (Pb,Sr,Ba)Nb 2 O 6 [1][2][3][4] owing to their potential applications in high energy storage devices. In energy storage capacitors, the energy density is related to the product of breakdown strength (BDS) squared and dielectric constant.…”

Preparation and properties of strontium barium niobate based glass-ceramics for energy storage capacitors

“…The breakdown strength, however, generally decreases with increasing ε r . Another common approach is to develop composites based on glass-ceramics [6,7] or polymerceramics [8] with the potential to get high ε r (associated with ceramics) and breakdown strength (associated with glass/polymers) simultaneously. Advantages of using glassceramics also include easy adjustability of composition and microstructure, and consequently good tunability of dielectric properties through changing glass composition before melt-casting and subsequent post-treatments.…”