Modulated structure of misfit-layered compound [Bi2.08Sr 1.67Oy]0.54[CoO2]

Kunio Yubuta; Shahnaz Begum; Yasuhiro Ono; Yuzuru Miyazaki; Tsuyoshi Kajitani

doi:10.1143/JJAP.45.4159

Modulated structure of misfit-layered compound [Bi_2.08Sr _1.67O_y]_0.54[CoO₂]

Kunio Yubuta, Shahnaz Begum, Yasuhiro Ono, Yuzuru Miyazaki, Tsuyoshi Kajitani

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

12 Citations (Scopus)

Abstract

The modulated structure of Bi_2.49Sr_2.00Co _2.22O_x is studied by electron diffraction analysis and high-resolution electron microscopy. The crystal structure consists of two interpenetrating subsystems of a CoO₂ sheet and a distorted four-layered rock-salt-type (Bi,Sr)O block. Both subsystems have common a-axes, c-axes and β-angles with a = 4.99 Å, c = 15.25 A, and β = 93.6°. On the other hand, the crystal structure is incommensurately modulated parallel to the b-axis, in which b₁ = 2.78 Å for the CoO₂ sheet and b₂ = 5.12 Å for the (Bi,Sr)O block, respectively. These vectors characterize the structural analogue as [Bi _2.08Sr_1.67O_y]_0.54[CoO₂]. It is found that this compound has various modulation vectors, q₁ = -a* + 0.54b₁*, q₂ = 0.05b₁* and locally q₃ = -0.14a* + 0.10b₁*. The intrinsic modulation vector q₂ is different from that in [Bi _0.87SrO₂]₂[CoO₂]_1.82 studied by Leligny et al. High-resolution images taken with the incident electron beam parallel to the a- and c-axes clearly exhibit modulated atomic arrangements. The local modulation mode characterized by the vector q ₃ is associated with the shear deformation in the a-b plane.

Original language	English
Pages (from-to)	4159-4164
Number of pages	6
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	45
Issue number	5 A
DOIs	https://doi.org/10.1143/JJAP.45.4159
Publication status	Published - 2006 May 9

Keywords

Electron diffraction
High-resolution image
Misfit-layered structure
Modulated structure
Residual strain
Shear deformation
Thermoelectric compound

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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Modulated structure of misfit-layered compound [Bi_2.08Sr _1.67O_y]_0.54[CoO₂]. / Yubuta, Kunio; Begum, Shahnaz; Ono, Yasuhiro; Miyazaki, Yuzuru; Kajitani, Tsuyoshi.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 45, No. 5 A, 09.05.2006, p. 4159-4164.

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

@article{afb45ad9d88a4d7fa7aba839b00d1fe3,

title = "Modulated structure of misfit-layered compound [Bi2.08Sr 1.67Oy]0.54[CoO2]",

abstract = "The modulated structure of Bi2.49Sr2.00Co 2.22Ox is studied by electron diffraction analysis and high-resolution electron microscopy. The crystal structure consists of two interpenetrating subsystems of a CoO2 sheet and a distorted four-layered rock-salt-type (Bi,Sr)O block. Both subsystems have common a-axes, c-axes and β-angles with a = 4.99 {\AA}, c = 15.25 A, and β = 93.6°. On the other hand, the crystal structure is incommensurately modulated parallel to the b-axis, in which b1 = 2.78 {\AA} for the CoO2 sheet and b2 = 5.12 {\AA} for the (Bi,Sr)O block, respectively. These vectors characterize the structural analogue as [Bi 2.08Sr1.67Oy]0.54[CoO2]. It is found that this compound has various modulation vectors, q1 = -a* + 0.54b1*, q2 = 0.05b1* and locally q3 = -0.14a* + 0.10b1*. The intrinsic modulation vector q2 is different from that in [Bi 0.87SrO2]2[CoO2]1.82 studied by Leligny et al. High-resolution images taken with the incident electron beam parallel to the a- and c-axes clearly exhibit modulated atomic arrangements. The local modulation mode characterized by the vector q 3 is associated with the shear deformation in the a-b plane.",

keywords = "Electron diffraction, High-resolution image, Misfit-layered structure, Modulated structure, Residual strain, Shear deformation, Thermoelectric compound",

author = "Kunio Yubuta and Shahnaz Begum and Yasuhiro Ono and Yuzuru Miyazaki and Tsuyoshi Kajitani",

year = "2006",

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AU - Yubuta, Kunio

AU - Begum, Shahnaz

AU - Ono, Yasuhiro

AU - Miyazaki, Yuzuru

AU - Kajitani, Tsuyoshi

PY - 2006/5/9

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N2 - The modulated structure of Bi2.49Sr2.00Co 2.22Ox is studied by electron diffraction analysis and high-resolution electron microscopy. The crystal structure consists of two interpenetrating subsystems of a CoO2 sheet and a distorted four-layered rock-salt-type (Bi,Sr)O block. Both subsystems have common a-axes, c-axes and β-angles with a = 4.99 Å, c = 15.25 A, and β = 93.6°. On the other hand, the crystal structure is incommensurately modulated parallel to the b-axis, in which b1 = 2.78 Å for the CoO2 sheet and b2 = 5.12 Å for the (Bi,Sr)O block, respectively. These vectors characterize the structural analogue as [Bi 2.08Sr1.67Oy]0.54[CoO2]. It is found that this compound has various modulation vectors, q1 = -a* + 0.54b1*, q2 = 0.05b1* and locally q3 = -0.14a* + 0.10b1*. The intrinsic modulation vector q2 is different from that in [Bi 0.87SrO2]2[CoO2]1.82 studied by Leligny et al. High-resolution images taken with the incident electron beam parallel to the a- and c-axes clearly exhibit modulated atomic arrangements. The local modulation mode characterized by the vector q 3 is associated with the shear deformation in the a-b plane.

AB - The modulated structure of Bi2.49Sr2.00Co 2.22Ox is studied by electron diffraction analysis and high-resolution electron microscopy. The crystal structure consists of two interpenetrating subsystems of a CoO2 sheet and a distorted four-layered rock-salt-type (Bi,Sr)O block. Both subsystems have common a-axes, c-axes and β-angles with a = 4.99 Å, c = 15.25 A, and β = 93.6°. On the other hand, the crystal structure is incommensurately modulated parallel to the b-axis, in which b1 = 2.78 Å for the CoO2 sheet and b2 = 5.12 Å for the (Bi,Sr)O block, respectively. These vectors characterize the structural analogue as [Bi 2.08Sr1.67Oy]0.54[CoO2]. It is found that this compound has various modulation vectors, q1 = -a* + 0.54b1*, q2 = 0.05b1* and locally q3 = -0.14a* + 0.10b1*. The intrinsic modulation vector q2 is different from that in [Bi 0.87SrO2]2[CoO2]1.82 studied by Leligny et al. High-resolution images taken with the incident electron beam parallel to the a- and c-axes clearly exhibit modulated atomic arrangements. The local modulation mode characterized by the vector q 3 is associated with the shear deformation in the a-b plane.

KW - Electron diffraction

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