Effect of La-substitution on the structure, dielectric and ferroelectric properties of Nb modified SrBi{sub 8}Ti{sub 7}O{sub 27} ceramics

Journal Article · Sat Aug 15 04:00:00 EDT 2015 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2015.03.059· OSTI ID:22475841

Parida, Geetanjali

Graphical abstract: The ferroelectric properties of Nb modified Bi{sub 4}Ti{sub 3}O{sub 12}–SrBi{sub 4}Ti{sub 4}O{sub 15} intergrowth ceramics increases significantly when Bi is substituted by La. - Highlights: • La{sup 3+} substitution for Bi{sup 3+} in Nb doped Bi{sub 4}Ti{sub 3}O{sub 12}–SrBi{sub 4}Ti{sub 4}O{sub 15} ferroelectrics is reported. • The orthorhombic distortion of the structure decreased with the increasing La. • La acts as a grain growth inhibitor in the ceramics. • The remnant polarization of the ferroelectrics increased significantly with La substitution. - Abstract: The effect of La substitution on the electrical properties of SrLa{sub x}Bi{sub 8−x}Ti{sub 6.88}Nb{sub 0}.{sub 12}O{sub 27} intergrowth Aurivillius phase ferroelectric ceramic was investigated. La content ‘x’ was ranging from 0.0 to 1.0 in a step of 0.2. The ceramic phase was synthesized through a modified oxalate route. X-ray diffraction was used to identify the phase and to investigate the change in lattice parameter and microstrain with the substitution. La-substitution does not affect the crystal structure of the intergrowth. Microstructural investigation revealed that the grain size of the ceramic decreases with La addition. The lattice parameters and orthorhombicity of intergrowth structure were found to decrease with increasing La substitution. The temperature dependence of dielectric behavior was investigated in the temperature range 30–700 °C and the frequency of 100 kHz. The remnant polarization 2P{sub r} increased and the Curie temperature T{sub c} decreased with the increase in the La substitution.

• OSTI ID: 22475841
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 68; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH COMPOUNDS
CERAMICS
CURIE POINT
DIELECTRIC PROPERTIES
DOPED MATERIALS
FERROELECTRIC MATERIALS
GRAIN GROWTH
GRAIN SIZE
LANTHANUM ADDITIONS
LATTICE PARAMETERS
NIOBIUM ADDITIONS
ORTHORHOMBIC LATTICES
OXALATES
POLARIZATION
STRONTIUM COMPOUNDS
TEMPERATURE DEPENDENCE
TITANATES
X-RAY DIFFRACTION