Off-axis electron holography and microstructure of Ba{sub 0.5}Sr{sub 0.5}TiO{sub 3} thin films on LaAlO{sub 3}

Journal Article · Tue Mar 15 04:00:00 EST 2005 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.71.115419· OSTI ID:20666259

Tian, H F; Yu, H C; Wang, Y G; Yang, H X; Li, J Q ^[1]; Zhu, X H; Zheng, D N ^[2]

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1. Beijing Laboratory of Electron Microscopy, Institute of Physics, Chinese Academy of Sciences, Beijing, 100080 (China)
2. National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing, 100080 (China)

Epitaxial Ba{sub 0.5}Sr{sub 0.5}TiO{sub 3} thin films grown on the (001) LaAlO{sub 3} substrates with a ferroelectric transition at about 250 K have been investigated by TEM and off-axis electron holography. Cross-sectional TEM observations show that the 350-nm-thick Ba{sub 0.5}Sr{sub 0.5}TiO{sub 3} film has a sharp interface with notable misfit dislocations. Off-axis electron holographic measurements reveal that, at low temperatures, the ferroelectric polarization results in a remarkable positive potential on the interface and a negative potential on the film surface, and, at room temperature, certain charges could only accumulate at the interfacial dislocations and other defective areas.

• OSTI ID: 20666259
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 11 Vol. 71; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINATES
BARIUM COMPOUNDS
DIELECTRIC MATERIALS
DISLOCATIONS
ELECTRONS
EPITAXY
HOLOGRAPHY
INTERFACES
LANTHANUM COMPOUNDS
LAYERS
MICROSTRUCTURE
POLARIZATION
STRONTIUM COMPOUNDS
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
THIN FILMS
TITANATES
TRANSMISSION ELECTRON MICROSCOPY