• 제목/요약/키워드: novel materials

검색결과 1,896건 처리시간 0.025초

A resistivity anomaly at 380 K in reproduced LK-99

  • Sangjin Kim;Kwang-Tak Kim;Jeonghun Kang;Dong-Hyeon Gim;Yoon Han Lee;Kee Hoon Kim
    • 한국초전도ㆍ저온공학회논문지
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    • 제25권4호
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    • pp.10-13
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    • 2023

  • To confirm the room-temperature superconductivity at ambient pressure as claimed in recent arXiv preprints by Lee et al., we followed the original authors' systematic solid-state synthesis recipe to reproduce Cu-doped Pb-apatite, known as LK-99. Using X-ray diffraction and Raman spectroscopy, we identified inclusion of various impurities alongside the apatite phase in our sample. While the sample exhibited an overall semiconducting behavior in electrical transport, an intriguing resistivity anomaly at 380 K was observed, possibly originating from a structural phase transition of the Cu2-δS impurity. Based on the transport and magnetization measurements, we conclude that the sample is a non-magnetic semiconductor, with absence of superconductivity.

  • https://doi.org/10.9714/psac.2023.25.4.010 인용 PDF

The Novel Liquid Crystal Materials for AM-LCDs

  • Yamaguchi, T.;Kibe, S.;Matsui, S.;Yamamoto, H.
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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    • pp.924-929
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    • 2002

  • We have developed the novel liquid crystal materials with a difluoromethyleneoxy (CF2O) moiety as a linkage group in order to satisfy the diversified various requirements for AM-LCDs. These novel CF2O LC materials have excellent physical properties that are high dielectric anisotropy, low viscosity and wide nematic temperature ranges. Physical properties measurement results that mixtures containing CF2O LC materials have suitable for characteristics for AM-LCDs. The CF2O LC materials are excellent compound for quick response and low driving voltage application.

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