Why does X-ray Diffraction Show Disappearing Peaks in CaCoH3?

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SUMMARY

The discussion focuses on the X-ray diffraction behavior of the perovskite hydride CaCoH3, which crystallizes in the cubic space group Pm-3m. It highlights that during the phase transition, diffraction peaks, specifically the (111) and (222) peaks, weaken and eventually disappear, indicating a significant structural change. Additionally, the electrical resistance of the sample shows metallic behavior at higher temperatures but increases at low temperatures around 4K, suggesting a transition to insulating behavior, which raises questions about potential superconductivity in the material.

PREREQUISITES
  • Understanding of X-ray diffraction techniques
  • Knowledge of crystallography, specifically cubic structures and space groups
  • Familiarity with electrical resistance measurements and temperature dependence
  • Basic concepts of superconductivity and phase transitions
NEXT STEPS
  • Research X-ray diffraction analysis of perovskite materials
  • Study the effects of phase transitions on crystallographic properties
  • Investigate the mechanisms behind resistance changes in superconductors
  • Explore temperature-dependent electrical properties of hydrides
USEFUL FOR

Materials scientists, physicists studying superconductivity, and researchers interested in the properties of perovskite hydrides will benefit from this discussion.

huyen
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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?.
 
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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.
 
and Why the resistance increase at low temperature. My sample is powder
 

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