Pulsed laser deposition of single-phase lead-free NKLNST thin films with K- and Na-excess targets

•PLD growth of NKLNST films was first attempted using targets incorporating excess K and Na.•Effects of O2 pressure during the PLD process on the films properties were systematically studied.•Proper amount of excess K (Na) and O2 pressure are key leading to high-quality single-phase films.•Best-qual...

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Bibliographic Details
Published in:Journal of alloys and compounds 2013-08, Vol.567, p.97-101
Main Authors: Zhu, Mingmin, Shang, Xunzhong, Chang, Gang, Li, Mingkai, Liu, Xiong, Zhou, Taosheng, He, Yunbin
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Deposition
Electric fields
Exact sciences and technology
Excess K and Na
Laser deposition
Lead free
Low O2 pressure
Materials science
Methods of deposition of films and coatings
film growth and epitaxy
NKLNST thin film
Ohmic
Optimization
Physics
Pulsed laser deposition
Silicon substrates
Thin films
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Summary:•PLD growth of NKLNST films was first attempted using targets incorporating excess K and Na.•Effects of O2 pressure during the PLD process on the films properties were systematically studied.•Proper amount of excess K (Na) and O2 pressure are key leading to high-quality single-phase films.•Best-quality film was deposited with the target incorporating 20mol% excess K and Na at 1Pa of O2.•Ohmic conduction and SCLC dominate the transport in the film at low and high fields, respectively. Lead-free [(Na0.57K0.43)0.94Li0.06][(Nb0.94Sb0.06)0.95Ta0.05]O3 (NKLNST) thin films were prepared on Pt (111)/Ti/SiO2/Si (001) substrates by pulsed laser deposition. NKLNST ceramic targets incorporating different amounts of excess K and Na were utilized in order to compensate the K and Na evaporation loss during the films deposition process, and the target containing 20mol% excess K and Na was found optimal based on the stoichiometry and crystallinity of the resulting films. With such a target and 1Pa of O2, high-quality NKLNST thin films were deposited, which exhibit a well-crystallized perovskite phase, the densest and smoothest surface and optimum structural and electrical properties, with a remnant polarization Pr of 7.18μC/cm2. Ohmic conduction dominates the transport at low electric fields (
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2013.03.049