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Large remanent polarization of (Bi,Nd)4Ti3O12 epitaxial thin films grown by metalorganic chemical vapor deposition
Abstract
(104)-oriented Bi4Ti3O12, La-substituted Bi4Ti3O12[(Bi3.44La0.56)Ti3O12] and Nd-substituted Bi4Ti3O12[(Bi3.54Nd0.46)Ti3O12] films were epitaxially grown on (111)SrRuO3//(111)SrTiO3 substrates at 700 °C by metalorganic chemical vapor deposition. All deposited films showed strong (104) orientations. The values of the remanent polarization (Pr) and coercive field (Ec) of the (104)-oriented epitaxial (Bi3.54Nd0.46)Ti3O12 thin film were 25 μC/cm2 and 135 kV/cm, respectively. This Pr value was larger than that of the (104)-oriented (Bi3.44La0.56)Ti3O12 film: Pr and Ec values of the (Bi3.44La0.56)Ti3O12 were 17 μC/cm2 and 145 kV/cm, respectively. These good ferroelectric properties of (Bi3.54Nd0.46)Ti3O12 films can be explained by a large tilting of TiO6 octahedra induced by the substitution of Nd3+, the ionic radius of which is smaller than that of La3+. Moreover, this Pr value is almost equal to that of commercially used lead zirconate titanate (PZT) films for nonvolatile ferroelectric random access memory (FeRAM) applications. These (104)-oriented epitaxial (Bi3.54Nd0.46)Ti3O12 thin films also showed a fatigue-free character. As a result, lead-free Nd-substituted Bi4Ti3O12 films with good ferroelectric properties comparable with those of PZT films are useful candidates for FeRAM applications.
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Shannon, R. D. (1976) · Acta Crystallographica Section A · doi:10.1107/s0567739476001551 · Cited by 66,145
Cited by
Two‐Dimensional Dielectric Nanosheets: Novel Nanoelectronics From Nanocrystal Building Blocks
Osada, M., & Sasaki, T. (2012) · Advanced Materials · doi:10.1002/adma.201103241 · Cited by 1,119
Self-citationMehring, M. (2007) · Coordination Chemistry Reviews · doi:10.1016/j.ccr.2006.06.005 · Cited by 293
Metadata
- Authors
- Kojima, T., Sakai, T., Watanabe, T., Funakubo, H., Saito, K., & Osada, M.
- Venue
- Applied Physics Letters
- Publisher
- AIP Publishing
- Published
- 2002-04-15
- Volume
- 80
- Issue
- 15
- Pages
- 2746-2748
- ISSN
- 0003-6951 (ISSN-L)
- 1077-3118
- OpenAlex
- W1516301772
- Cited by
- 351
- References
- 1
- FWCI
- 25.74
- Type
- journal article
- Language
- en
- Open access
- closed
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- Kojima, T., Sakai, T., Watanabe, T., Funakubo, H., Saito, K., & Osada, M. (2002). Large remanent polarization of (Bi,Nd)4Ti3O12 epitaxial thin films grown by metalorganic chemical vapor deposition. Applied Physics Letters. https://doi.org/10.1063/1.1468914
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