Formation of highly oriented nanopores via crystallization of amorphous Nb2O5 and Ta2O5

R. Nakamura; M. Ishimaru; K. Sato; K. Tanaka; H. Nakajima; T. J. Konno

doi:10.1063/1.4822300

Formation of highly oriented nanopores via crystallization of amorphous Nb₂O₅ and Ta₂O₅

R. Nakamura, M. Ishimaru, K. Sato, K. Tanaka, H. Nakajima, T. J. Konno

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

Formation of self-oriented and -elongated nanopores in annealed amorphous Nb₂O₅ and Ta₂O₅ was analyzed by transmission electron microscopy. Along with their crystal growth, nanopores were spontaneously elongated in the a-axis direction perpendicular to the longitudinal b axis of the orthorhombic structures with strong anisotropy. In addition, the effect of tungsten on the nanovoid formation in annealed amorphous Nb₂O₅ and Ta₂O₅ was also studied. Additive tungsten atoms of a few atomic percent into Nb₂O₅ and Ta₂O₅ were found to make the aspect ratio of nanopores larger. Electron diffraction experiments revealed that the crystallized regions including elongated nanopores possess a variety of periodicity in the b-axis direction. This structural flexibility in the crystal growth of strong anisotropic structures seems to play an important role on the unidirectional growth of nanopores.

Original language	English
Article number	124308
Journal	Journal of Applied Physics
Volume	114
Issue number	12
DOIs	https://doi.org/10.1063/1.4822300
Publication status	Published - 2013 Sept 28

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Formation of highly oriented nanopores via crystallization of amorphous Nb2O5 and Ta2O5",

abstract = "Formation of self-oriented and -elongated nanopores in annealed amorphous Nb2O5 and Ta2O5 was analyzed by transmission electron microscopy. Along with their crystal growth, nanopores were spontaneously elongated in the a-axis direction perpendicular to the longitudinal b axis of the orthorhombic structures with strong anisotropy. In addition, the effect of tungsten on the nanovoid formation in annealed amorphous Nb2O5 and Ta2O5 was also studied. Additive tungsten atoms of a few atomic percent into Nb2O5 and Ta2O5 were found to make the aspect ratio of nanopores larger. Electron diffraction experiments revealed that the crystallized regions including elongated nanopores possess a variety of periodicity in the b-axis direction. This structural flexibility in the crystal growth of strong anisotropic structures seems to play an important role on the unidirectional growth of nanopores.",

author = "R. Nakamura and M. Ishimaru and K. Sato and K. Tanaka and H. Nakajima and Konno, {T. J.}",

note = "Funding Information: TEM observations were carried out at the Research Center for Ultra-High Voltage Electron Microscopy and the Comprehensive Analysis Center of ISIR, Osaka University. A portion of this study was performed under the inter-university cooperative research program of the IMR, Tohoku University. This work was supported by Grant-in-Aid for Young Scientists (B) (No. 24760574). ",

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doi = "10.1063/1.4822300",

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AU - Nakamura, R.

AU - Ishimaru, M.

AU - Sato, K.

AU - Tanaka, K.

AU - Nakajima, H.

AU - Konno, T. J.

N1 - Funding Information: TEM observations were carried out at the Research Center for Ultra-High Voltage Electron Microscopy and the Comprehensive Analysis Center of ISIR, Osaka University. A portion of this study was performed under the inter-university cooperative research program of the IMR, Tohoku University. This work was supported by Grant-in-Aid for Young Scientists (B) (No. 24760574).

PY - 2013/9/28

Y1 - 2013/9/28

N2 - Formation of self-oriented and -elongated nanopores in annealed amorphous Nb2O5 and Ta2O5 was analyzed by transmission electron microscopy. Along with their crystal growth, nanopores were spontaneously elongated in the a-axis direction perpendicular to the longitudinal b axis of the orthorhombic structures with strong anisotropy. In addition, the effect of tungsten on the nanovoid formation in annealed amorphous Nb2O5 and Ta2O5 was also studied. Additive tungsten atoms of a few atomic percent into Nb2O5 and Ta2O5 were found to make the aspect ratio of nanopores larger. Electron diffraction experiments revealed that the crystallized regions including elongated nanopores possess a variety of periodicity in the b-axis direction. This structural flexibility in the crystal growth of strong anisotropic structures seems to play an important role on the unidirectional growth of nanopores.

AB - Formation of self-oriented and -elongated nanopores in annealed amorphous Nb2O5 and Ta2O5 was analyzed by transmission electron microscopy. Along with their crystal growth, nanopores were spontaneously elongated in the a-axis direction perpendicular to the longitudinal b axis of the orthorhombic structures with strong anisotropy. In addition, the effect of tungsten on the nanovoid formation in annealed amorphous Nb2O5 and Ta2O5 was also studied. Additive tungsten atoms of a few atomic percent into Nb2O5 and Ta2O5 were found to make the aspect ratio of nanopores larger. Electron diffraction experiments revealed that the crystallized regions including elongated nanopores possess a variety of periodicity in the b-axis direction. This structural flexibility in the crystal growth of strong anisotropic structures seems to play an important role on the unidirectional growth of nanopores.

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Formation of highly oriented nanopores via crystallization of amorphous Nb₂O₅ and Ta₂O₅

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