Effects of lithium doping on microstructure, electrical properties, and chemical bonds of sol-gel derived NKN thin films
- Department of Electrical Engineering, National Cheng Kung University, Tainan 701, Taiwan (China)
- Department of Electronic Engineering, National Kaohsiung Normal University, Kaohsiung 802, Taiwan (China)
- Department of Digital Game and Animation Design, Tung-Fang Design University, Kaohsiung 829, Taiwan (China)
Highly (100/110) oriented lead-free Li{sub x}(Na{sub 0.5}K{sub 0.5}){sub 1−x}NbO{sub 3} (LNKN, x = 0, 0.02, 0.04, and 0.06) thin films are fabricated on Pt/Ti/SiO{sub 2}/Si substrates via a sol-gel processing method. The lithium (Li) dopants modify the microstructure and chemical bonds of the LNKN films, and therefore improve their electrical properties. The optimal values of the remnant polarization (P{sub r} = 14.3 μC/cm{sup 2}), piezoelectric coefficient (d{sub 33} = 48.1 pm/V), and leakage current (<10{sup −5} A/cm{sup 2}) are obtained for a lithium addition of x = 0.04 (i.e., 4 at. %). The observation results suggest that the superior electrical properties are the result of an improved crystallization, a larger grain size, and a smoother surface morphology. It is shown that the ion transport mechanism is dominated by an Ohmic behavior under low electric fields and the Poole-Frenkel emission effect under high electric fields.
- OSTI ID:
- 22413186
- Journal Information:
- Journal of Applied Physics, Vol. 117, Issue 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dielectric and piezoelectric properties of (x)Pb(Mg{sub 1/3}Nb{sub 2/3})O{sub 3}-- (1-x)Pb(Zr{sub 1/2}Ti{sub 1/2})O{sub 3} thin films prepared by the sol--gel method
A new Bi{sub 0.5}Na{sub 0.5}TiO{sub 3} based lead-free piezoelectric system with calculated end-member Bi(Zn{sub 0.5}Hf{sub 0.5})O{sub 3}
Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHEMICAL BONDS
CONCENTRATION RATIO
CRYSTALLIZATION
DOPED MATERIALS
ELECTRIC FIELDS
ELECTRICAL PROPERTIES
GRAIN SIZE
LEAKAGE CURRENT
LITHIUM COMPOUNDS
MORPHOLOGY
NIOBATES
PIEZOELECTRICITY
POLARIZATION
POTASSIUM COMPOUNDS
SILICON
SILICON OXIDES
SODIUM COMPOUNDS
SOL-GEL PROCESS
SUBSTRATES
THIN FILMS