Ferroelectric and optical properties of Ba0.8Sr0.2TiO3 thin film

被引：81

作者：

Pontes, FM

Leite, ER

Pontes, DSL

Longo, E

Santos, EMS

Mergulhao, S

Pizani, PS

Lanciotti, F

Boschi, TM

Varela, JA

机构：

[1] Univ Fed Sao Carlos, Dept Chem, CMDMC, LIEC, BR-13565905 Sao Carlos, SP, Brazil

[2] Univ Fed Sao Carlos, Dept Phys, BR-13565905 Sao Carlos, SP, Brazil

[3] UNESP, Inst Chem, Araraquara, SP, Brazil

来源：

JOURNAL OF APPLIED PHYSICS | 2002年 / 91卷 / 09期

关键词：

D O I：

10.1063/1.1466526

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Barium strontium titanate (Ba0.8Sr0.2TiO3) thin films have been prepared on Pt/Ti/SiO2/Si substrates using a soft solution processing. X-ray diffraction and also micro-Raman spectroscopy showed that the Ba0.8Sr0.2TiO3 thin films exhibited a tetragonal structure at room temperature. The presence of Raman active modes was clearly shown at the 299 and 725 cm(-1) peaks. The tetragonal-to-cubic phase transition in the Ba0.8Sr0.2TiO3 thin films is broadened, and suppressed at about 35 degreesC, with a maximum dielectric constant of 948 (100 kHz). Electrical measurements for the prepared Ba0.8Sr0.2TiO3 thin films showed a remnant polarization (P-r) of 6.5 muC/cm(2), a coercive field (E-c) of 41 kV/cm, and good insulating properties. The dispersion of the refractive index is interpreted in terms of a single electronic oscillator at 6.97 eV. The direct band gap energy (E-g) and the refractive index (n) are estimated to be 3.3 eV and n = 2.27-2.10, respectively. (C) 2002 American Institute of Physics.

引用

页码：5972 / 5978

页数：7

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