Microstructure related to a low-temperature transition in Ba 2NaNb 5O 15

S. Mori, N. Yamamoto, Yasumasa Koyama, Y. Uesu

    Research output: Chapter in Book/Report/Conference proceedingChapter

    2 Citations (Scopus)

    Abstract

    In order to investigate a microstructure in a low temperature region of Ba 2NaNb 5O 15. in-situ observation was made in the temperature range between room temperature and 25K by transmission electron microscopy. It was found that, in addition to satellite reflection spots due to the incommensurate phase, both new satellite reflection spots at h, k, 1 ±1/2 positions and diffuse streaks running through h. k±1/2. 1 ±1/2 positions along the [100] direction appear around 200K in diffraction patterns on cooling, together with the appearance of the microdornams elongated along the [010] direction in dark field images. It is indicated from an analysis of both the diffraction patterns and dark field images that the streak is due to an irregular arrangement of out-of phase boundaries between the microdomains. A nature of the low-temperature transition in Ba 2NaNb 5O 15 is briefly discussed.

    Original languageEnglish
    Title of host publicationFerroelectrics
    Pages13-18
    Number of pages6
    Volume190
    Edition1-4
    Publication statusPublished - 1997

    Fingerprint

    Superconducting transition temperature
    diffraction patterns
    Diffraction patterns
    microstructure
    Microstructure
    Satellites
    Phase boundaries
    cooling
    Temperature
    transmission electron microscopy
    room temperature
    Transmission electron microscopy
    Cooling
    temperature
    Direction compound

    ASJC Scopus subject areas

    • Materials Science(all)
    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

    Cite this

    Mori, S., Yamamoto, N., Koyama, Y., & Uesu, Y. (1997). Microstructure related to a low-temperature transition in Ba 2NaNb 5O 15 In Ferroelectrics (1-4 ed., Vol. 190, pp. 13-18)

    Microstructure related to a low-temperature transition in Ba 2NaNb 5O 15 . / Mori, S.; Yamamoto, N.; Koyama, Yasumasa; Uesu, Y.

    Ferroelectrics. Vol. 190 1-4. ed. 1997. p. 13-18.

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Mori, S, Yamamoto, N, Koyama, Y & Uesu, Y 1997, Microstructure related to a low-temperature transition in Ba 2NaNb 5O 15 in Ferroelectrics. 1-4 edn, vol. 190, pp. 13-18.
    Mori S, Yamamoto N, Koyama Y, Uesu Y. Microstructure related to a low-temperature transition in Ba 2NaNb 5O 15 In Ferroelectrics. 1-4 ed. Vol. 190. 1997. p. 13-18
    Mori, S. ; Yamamoto, N. ; Koyama, Yasumasa ; Uesu, Y. / Microstructure related to a low-temperature transition in Ba 2NaNb 5O 15 Ferroelectrics. Vol. 190 1-4. ed. 1997. pp. 13-18
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    abstract = "In order to investigate a microstructure in a low temperature region of Ba 2NaNb 5O 15. in-situ observation was made in the temperature range between room temperature and 25K by transmission electron microscopy. It was found that, in addition to satellite reflection spots due to the incommensurate phase, both new satellite reflection spots at h, k, 1 ±1/2 positions and diffuse streaks running through h. k±1/2. 1 ±1/2 positions along the [100] direction appear around 200K in diffraction patterns on cooling, together with the appearance of the microdornams elongated along the [010] direction in dark field images. It is indicated from an analysis of both the diffraction patterns and dark field images that the streak is due to an irregular arrangement of out-of phase boundaries between the microdomains. A nature of the low-temperature transition in Ba 2NaNb 5O 15 is briefly discussed.",
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    AU - Uesu, Y.

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    AB - In order to investigate a microstructure in a low temperature region of Ba 2NaNb 5O 15. in-situ observation was made in the temperature range between room temperature and 25K by transmission electron microscopy. It was found that, in addition to satellite reflection spots due to the incommensurate phase, both new satellite reflection spots at h, k, 1 ±1/2 positions and diffuse streaks running through h. k±1/2. 1 ±1/2 positions along the [100] direction appear around 200K in diffraction patterns on cooling, together with the appearance of the microdornams elongated along the [010] direction in dark field images. It is indicated from an analysis of both the diffraction patterns and dark field images that the streak is due to an irregular arrangement of out-of phase boundaries between the microdomains. A nature of the low-temperature transition in Ba 2NaNb 5O 15 is briefly discussed.

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