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Phase transtion

  1. Jun 22, 2011 #1

    Hope somebody can help me.
    I am studing perovskite hydride CaCoH3 using X-ray diffraction. CaCoH3 crystallizes with a cubic in space group Pm-3m. At phase transtion point, all peaks weakened gradually, and shifted to higher energy.The (111) and (222) peaks become weak and disappeared . Why that peaks are disappear?.
  2. jcsd
  3. Jun 22, 2011 #2
    2. To study the temperature dependence of electrical resistance;
    The R-T slope showed metallic. But the resistance revealed increase at lowtemperature around 4K, which show insulator up to 55mK (increase 70%). What is effect? I hope my sample beome superconductivity.
  4. Jun 22, 2011 #3
    and Why the resistance increase at low temperature. My sample is powder
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