Preparation and conductivity measurement of Eu doped BaTiO3 nanoceramic

Effect of La substitution on the structural and dielectric properties of BaZr0.1Ti0.9O3 ceramics

“…On the other hand, the substitution of aliovalent cations in BaTiO 3 resulted in significant change in the electrical characteristics because of their acceptor/donor behaviour [9]. Trivalent rare earth cations are widely used to modify the BaTiO 3 properties because of their moderate ionic radii and ability to substitute both A and B sites [10][11][12][13][14][15][16][17][18]. The ionic radii of the rare earth ions are in between that of Ba 2+ ion and Ti 4+ ions [19].…”

Influence of crystallite size on the thermal conductivity in BaTiO3 nanoceramics

“…Zhao et al 12 have extensively studied the influence of grain size effects on the ferroelectric behavior of the dense nanocrystalline BaTiO 3 ceramics in terms of Landau-Ginsburg-Devonshire theory of isolated particles. 17 In this work we present the measurements of thermal conductivity of three BaTiO 3 nanoceramics characterized by the different grain sizes of 30, 70, and 100 nm. Moreover, Zhao et al proposed that the critical grain size which corresponds with the existing of the ferroelectric behavior was estimated to be 10-30 nm.…”

Dielectric study of calcium doped barium titanate Ba1-xCaxTiO3 ceramics

“…Because of its excellent ferroelectric properties, to which is added the very good stability of its chemical and mechanical perovskite structure, barium titanate BaTiO 3 remains the preferred material for many applications such as: dielectric capacitors (Hung et al, 2003), ceramics with Positive Temperature Coefficient of Resistance: PTCR (Hreniak et al, 2006). BaTiO 3 is known for its transition or Curie temperature, T C of 120°C (Haertling, 1999) which delimits the two dielectric states: ferroelectric state for T<T C in which the material crystallizes in the quadratic system and paraelectric state for T˃T C where the structure becomes cubic system.…”