Dielectric properties of barium titanate prepared by hot isostatic pressing

Influence of CaZrO3 on dielectric properties and microstructures of BaTiO3-based X8R ceramics

“…According to equation (2), no charge compensation occurred in the case of Ca 2+ and Zr 4+ incorporation to BaTiO 3 . Therefore, the lower porosity and higher density should be responsible for the improvement of resistivity and dielectric losses [10][11][12] . 3 3 XRD analyses showed that there was no secondary phase in all the samples.…”

Spark plasma sintering of nanocrystalline BaTiO3-powders: Consolidation behavior and dielectric characteristics

“…8(a)), which is associated with a lower porosity and enhanced densification and grain growth. 8 The M-BT samples also show the development of almost frequency independent losses for high values of the sintering temperatures. Most of the M-BT samples show higher values of dielectric losses compared to those obtained for A-BT, as shown in Fig.…”

“…5,6 This leads in average to a reduction of the tetragonal distortion of the lattice and a decrease of the herewith connected ferroelectric polarization. Arlt et al showed that for BaTiO 3 maximum values of permittivity around 5000 can be achieved at grain sizes of 0.8-1 m. 7 Similarly, Hirata et al reported later that the dielectric constant showed a slightly higher maximum of 5700 at a grain size of approximately 1.4 m. 8 In any case, however, a marked decrease of the relative dielectric constant with diminishing grain-size is observed. Contrary to this, Guillemet-Fritsch et al reported recently that ultrafine La-doped BaTiO 3 ceramics with an average grain size of only 250-300 nm unexpectedly show colossal permittivity values up to 10 6 .…”

Sintering behaviors and dielectric properties of nanocrystalline barium titanate

“…There have been many studies investigating the influence of grain sizes on the dielectric properties of BaTiO 3 ceramics. For bulk BaTiO 3 , most of the studies aimed at the samples with grain sizes about in the range of 1-50 m and a decrease of dielectric constants with the increase of grain sizes were observed [5][6][7][8][9][10][11][12]. For instance, Arlt and Hennings reported that the BaTiO 3 with fine (1 m) and coarse (50 m) grain structures possess the dielectric constants of 4800 and 1200 at the room-temperature, respectively [5].…”

“…Herard et al found that the dielectric constants of BaTiO 3 is in the range of 1500-2700 when its grain size was 10 m [6]. On the other hand, the BaTiO 3 with about 1 m grain size was found to exhibit dielectric constant about 3500-5000 [7]. Effects of internal stresses [8] and the increase of 90 • -domain wall density [9][10][11][12] were proposed to explain the change of dielectric properties with grain sizes of BaTiO 3 samples.…”