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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effects of strontium and calcium simultaneous substitution on electrical and structural properties of Pb1-x-y Ca (x) Sr (y) TiO3 thin films

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Author(s):
Pontes, D. S. L. [1] ; Longo, E. [1] ; Pontes, F. M. [2] ; Galhiane, M. S. [2] ; Santos, L. S. [2] ; Pereira-da-Silva, Marcelo A. [3, 4] ; da Silva, J. H. D. [5] ; Chiquito, A. J. [6] ; Pizani, P. S. [6]
Total Authors: 9
Affiliation:
[1] Univ Estadual Paulista, Inst Chem, BR-14801970 Sao Paulo - Brazil
[2] Univ Estadual Paulista, Dept Chem, LAMAC, BR-17033360 Sao Paulo - Brazil
[3] UNICEP, Ctr Univ Cent Paulista, BR-13563470 Sao Carlos, SP - Brazil
[4] Univ Sao Paulo, Inst Fis, BR-13560250 Sao Carlos, SP - Brazil
[5] Sao Paulo State Univ, UNESP, Adv Mat Grp, Dept Phys, BR-13563470 Bauru, SP - Brazil
[6] Univ Fed Sao Carlos, Dept Phys, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 6
Document type: Journal article
Source: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING; v. 96, n. 3, p. 731-740, AUG 2009.
Web of Science Citations: 3
Abstract

Ferroelectric Pb(1-x-y) Ca (x) Sr (y) TiO(3) thin films (denoted by PCST90, PCST70, and PCST30) were deposited on the Pt/Ti/SiO(2)/Si substrates by a chemical solution deposition method. Their properties were investigated from the viewpoint of crystal structure, microstructure, dielectric, and ferroelectric properties. X-ray diffraction patterns revealed the formation of PCST90, PCST70, and PCST30 thin films without any secondary phases. Infrared and Raman spectroscopy results show that a gradual phase transition from tetragonal to pseudocubic or cubic perovskite structure may occur in PCST thin films with the simultaneous increase of Ca(2+) and Sr(2+) contents. Both substitution of isovalent Ca(2+) and Sr(2+) at Pb(2+)-site enhanced the dielectric constant and reduced the remnant polarization. In addition, ferroelectric test analyses show that the PCST thin films undergo a ferroelectric-to-paraelectric phase transformation with an amount of Pb(2+), Ca(2+), and Sr(2+) at 30%, 35%, and 35% mol, respectively. Hence, the absence of ferroelectric property may be attributed to a decreasing of the octahedron distortion in the perovskite structure accompanied by a weakening of long-range ferroelectric order. (AU)