Dielectric and ferroelectric properties of BaTiO3 thin films grown by the sol-gel process

Abstract

Transparent smooth and crack-free BaTiO3 thin films were deposited on stainless steel, fused silica, platinum plates, and platinized silicon wafers (100) using the sol-gel process. Barium 2-ethyl hexanoate and titanium isopropoxide were used as precursors. Annealing of the films at 750 °C for 2 h was necessary to get polycrystalline films. The electrical properties of the films prepared on stainless-steel substrates showed an electrode barrier effect whereas those prepared on platinum substrates were susceptible to ambient atmospheric humidity. However, films grown on platinum substrates and measured under dry conditions showed very good electrical properties. Ferroelectric hysteresis and C-V characteristics were also studied on these films.

Physical Kinetics of Ferroelectric Hysteresis

“…Both experimentally [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] and theoretically [19][20][21][22][23][24][25][26][27][28], the polarization can be changed in direction via a dynamic switching process accompanied by hysteresis [9,[28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. Some of the partially understood experimental properties of ferroelectric domains [27,[48]…”

Frequency dependence of dielectric properties and electrical conductivity of Cu/nano-SnO2 thick film/Cu arrangement

“…As observed dielectric loss decreases with increasing frequency and, accordingly, s ac increases. The phenomenon of AC conductivity increasing alongside frequency increase shows that it must be related to the bound carriers trapped in the sample, or due to a gradual decrease in series resistance with increasing frequency [21,26,27]. Frequency dependence of the AC conductivity resembles that of hopping type conduction.…”

Electrical transport in low-lead (1−x)BaTiO3–xPbMg1/3Nb2/3O3 ceramics

“…7), which may be due to the existence of free as well as bound carriers. In the first case, the conductivity must decrease with increasing frequency [24]. In the second case, the conductivity increases with increasing frequency, which is the case for our samples.…”