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Binary Compound

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Naoki Takahashi – One of the best experts on this subject based on the ideXlab platform.

  • phase transformation behavior of a pyrochlore type ceo2 zro2 Binary Compound
    Journal of the American Ceramic Society, 2015
    Co-Authors: Akira Morikawa, Kae Yamamura, Akihiko Suda, Toshitaka Tanabe, Takeshi Nobukawa, Akiya Chiba, Naoki Takahashi

    Abstract:

    The phase transformation behavior of the superlattice structure of a CeO2–ZrO2 pyrochlore-type Binary Compound (CP) was investigated so as to better understand how to improve the thermal stability of such a system. CP was synthesized through high-temperature reduction of a conventional CeO2–ZrO2 solid solution with a 1:1 molar ratio of Ce and Zr. High-resolution transmission electron microscopy and selected-area electron diffraction clearly revealed that the pyrochlore structure of CP transformed to the standard disordered cubic fluorite or tetragonal zirconia structure after having been subjected to a high-temperature durability test; moreover, it was determined that this phase transformation moves inward from the crystallite surface. This discovery suggests a new method by which to improve upon this material for practical applications.

  • Phase Transformation Behavior of a Pyrochlore‐Type CeO2–ZrO2 Binary Compound
    Journal of the American Ceramic Society, 2014
    Co-Authors: Akira Morikawa, Kae Yamamura, Akihiko Suda, Toshitaka Tanabe, Takeshi Nobukawa, Akiya Chiba, Naoki Takahashi

    Abstract:

    The phase transformation behavior of the superlattice structure of a CeO2–ZrO2 pyrochlore-type Binary Compound (CP) was investigated so as to better understand how to improve the thermal stability of such a system. CP was synthesized through high-temperature reduction of a conventional CeO2–ZrO2 solid solution with a 1:1 molar ratio of Ce and Zr. High-resolution transmission electron microscopy and selected-area electron diffraction clearly revealed that the pyrochlore structure of CP transformed to the standard disordered cubic fluorite or tetragonal zirconia structure after having been subjected to a high-temperature durability test; moreover, it was determined that this phase transformation moves inward from the crystallite surface. This discovery suggests a new method by which to improve upon this material for practical applications.

Akira Morikawa – One of the best experts on this subject based on the ideXlab platform.

  • phase transformation behavior of a pyrochlore type ceo2 zro2 Binary Compound
    Journal of the American Ceramic Society, 2015
    Co-Authors: Akira Morikawa, Kae Yamamura, Akihiko Suda, Toshitaka Tanabe, Takeshi Nobukawa, Akiya Chiba, Naoki Takahashi

    Abstract:

    The phase transformation behavior of the superlattice structure of a CeO2–ZrO2 pyrochlore-type Binary Compound (CP) was investigated so as to better understand how to improve the thermal stability of such a system. CP was synthesized through high-temperature reduction of a conventional CeO2–ZrO2 solid solution with a 1:1 molar ratio of Ce and Zr. High-resolution transmission electron microscopy and selected-area electron diffraction clearly revealed that the pyrochlore structure of CP transformed to the standard disordered cubic fluorite or tetragonal zirconia structure after having been subjected to a high-temperature durability test; moreover, it was determined that this phase transformation moves inward from the crystallite surface. This discovery suggests a new method by which to improve upon this material for practical applications.

  • Phase Transformation Behavior of a Pyrochlore‐Type CeO2–ZrO2 Binary Compound
    Journal of the American Ceramic Society, 2014
    Co-Authors: Akira Morikawa, Kae Yamamura, Akihiko Suda, Toshitaka Tanabe, Takeshi Nobukawa, Akiya Chiba, Naoki Takahashi

    Abstract:

    The phase transformation behavior of the superlattice structure of a CeO2–ZrO2 pyrochlore-type Binary Compound (CP) was investigated so as to better understand how to improve the thermal stability of such a system. CP was synthesized through high-temperature reduction of a conventional CeO2–ZrO2 solid solution with a 1:1 molar ratio of Ce and Zr. High-resolution transmission electron microscopy and selected-area electron diffraction clearly revealed that the pyrochlore structure of CP transformed to the standard disordered cubic fluorite or tetragonal zirconia structure after having been subjected to a high-temperature durability test; moreover, it was determined that this phase transformation moves inward from the crystallite surface. This discovery suggests a new method by which to improve upon this material for practical applications.

Christian Kloc – One of the best experts on this subject based on the ideXlab platform.

  • impact of c h x x f n and π π interactions on tuning the degree of charge transfer in f6tnap based organic Binary Compound single crystals
    Crystal Growth & Design, 2018
    Co-Authors: Peng Hu, Hui Jiang, Shancheng Wang, Apoorva Chaturvedi, Xiaotao Zhang, Rongjin Li, Yongxin Li, Yi Long, Christian Kloc

    Abstract:

    Single crystals of four new charge transfer Compounds, triphenylene (TP)-1,3,4,5,7,8-hexafluorotetracyanonaphthoquinodimethane (F6TNAP), pyrene-F6TNAP, phenanthrene (PA)-F6TNAP, and naphtho[1,2-b:5,6-b’]dithiophene (NDT)-F6TNAP, with needle-like morphologies and dark color were grown by chemical vapor transport. The influence of C–H···X (X = F, N) interactions as well π–π interactions on the degree of charge transfer (DCT) in these Compounds was investigated. The results indicate that the DCT is proportional to the interplanar D–A distance along the π–π interaction direction in TP-F6TNAP, pyrene-F6TNAP, and PA-F6TNAP single crystals. With the decreasing of the D–A interplanar distance from 3.3560 A of TP-F6TNAP to 3.3254 A of PA-F6TNAP, the DCT is significantly increased from 0.03 ± 0.02 of TP-F6TNAP to 0.26 ± 0.03 of PA-F6TNAP, showing the strong relationship between π–π interactions and the DCT. In addition to π–π interactions, a stronger C–H···F interaction (C–H···F bond length: 2.3689 A) is observed i…

  • Crystal Growth, HOMO–LUMO Engineering, and Charge Transfer Degree in Perylene-FxTCNQ (x = 1, 2, 4) Organic Charge Transfer Binary Compounds
    Crystal Growth & Design, 2016
    Co-Authors: Peng Hu, Ke-zhao Du, Hui Jiang, Christian Kloc

    Abstract:

    The methodologies of searching for novel organic charge transfer Binary Compounds and large-size crystal growth, in the case that only the two starting organic substances are known but the phase diagram is not known, the thermodynamic data of the Binary Compound are not known, and even the existence of new Binary Compounds is not known, were studied. Centimeter-long crystals of novel perylene-F1TCNQ, perylene-F2TCNQ, and perylene-F4TCNQ charge transfer Binary Compounds are obtained from the gas phase. Kinetically lowering the sublimation rate is the key factor for growing large-size charge transfer Compound single crystals. Changing the number of fluorine atoms in FxTCNQ results in the variation of the electron affinity, which further changes the HOMO–LUMO of acceptor. Charge transfer degree is increased with increasing of fluorine atoms in the perylene-FxTCNQ system. Therefore, the structure, stoichiometry, and kind of donor and acceptor enable HOMO–LUMO engineering of the charge transfer Compound and tu…