Rare Earth Substituted Bi4Ti3O12Thin Films with Large Ferroelectric Response

Autor:	Surinder P. Singh, Ram S. Katiyar, R. E. Melgarejo, Maharaj S. Tomar
Rok vydání:	2005
Předmět:	Spin coating Materials science Bismuth titanate Analytical chemistry Substrate (electronics) Condensed Matter Physics Ferroelectricity Electronic Optical and Magnetic Materials chemistry.chemical_compound symbols.namesake chemistry symbols Thin film Raman spectroscopy Solid solution Sol-gel
Zdroj:	Ferroelectrics. 328:99-102
ISSN:	1563-5112 0015-0193
Popis:	Rare earth substituted Bi4Ti3O12, such as, Bi4−x Nd x Ti3O12 (BNT) are important materials for ferroelectric memory devices. BNT materials at different concentration of Nd substitution were synthesized by sol-gel process, and thin films were deposited on Pt (i.e. Pt/TiO2/SiO2/Si) substrate by spin coating. Structural properties of the films were examined by x-ray and Raman spectroscopy, which shows a complete solid solution for the compositions x < 0.85. Ferroelectric response was measured for various film compositions. The 0.65 μm thick Bi3.44Nd0.56Ti3O12 (BNT56) film showed a ferroelectric polarization P r = 70 μC/cm2 ( 2 P r = 140 μC/cm2). Exceptionally large polarization in Bi3.44Nd0.56Ti3O12 film is attributed to the suppression of c-axis growth by with improved diffusion controlled processing of the films, and the dipole formation which tilts TiO6 tetrahedron to Bi2O2 interlayer of the unit cell.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7aa697405ce277000ed54155e567f7d4 https://doi.org/10.1080/00150190500311326 Zobrazit plný text záznamu