Sol–gel synthesis and characterization of Ba(1−)Sr TiO3 ceramics

Structural, electrical and piezoelectric properties of nanocrystalline tin-substituted barium titanate ceramics

“…It is reported that ferroelectricity in electroceramics decreases with decreasing particle size and disappears below certain critical size [25]. The increase of Sr content in Ba (1−x) Sr x TiO 3 ceramics synthesized from nanopowders causes the inhibition of grain growth and downward shift of Curie temperature (T c ) [26]. It is also reported that the nano-crystalline Ba 0.5 Sr 0.5 TiO 3 powders prepared by sol-gel method were crystallized to the tetragonal phase after sintering at 750 • C for 1 h with the Curie temperature for the resulting ceramics to be only 75 • C [27].…”

High tunability of pulsed laser deposited Ba0.7Sr0.3TiO3 thin films on perovskite oxide electrode

“…The perovskite thin film of (Ba,Sr)TiO 3 (BST) exhibits high relative dielectric constant, low dielectric dissipation factor, low leakage current, and strong tunability under an external dc electric field. BST can be integrated to the existing semiconductor processing technology for next generation of gigabyte dynamic random access memories (DRAMs), microwave tunable devices, field effect transistors (FETs), and electrooptic devices [7][8][9][10][11][12][13].…”

“…Ferroelectric thin films have been successfully deposited by rf sputtering [17][18][19], metal organic chemical vapor deposition [17], sol gel [8,9,12,17] and pulsed laser deposition (PLD) [7,17,[20][21][22][23][24]. Among these processes the PLD technique is superior since it possesses the advantages viz., lower synthesis temperature, easy to control the stoichiometry of thin films, possibility of depositing oxides of high melting point and materials of metastable phase [17].…”

Dielectric and tunable properties of barium strontium titanate ceramics under the stresses

“…The Curie temperature (T c ) of BST could be tailored by altering mole ratio of Ba/Sr, or ions doping concentrations, etc. [4][5][6][7] in order to meet various requirements of practical applications. Actually, in the field of some applications, materials itself or devices could be exposed to the self-induced internal stress or external stress.…”