Proceedings of the Korean Vacuum Society Conference (한국진공학회:학술대회논문집)

The Korean Vacuum Society (한국진공학회)
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Temperature-dependent Structural and Magnetic Properties of Diamagnetic $HgI_2$

  • Park, C.I. (Department of Physics Education and Institute of Fusion Science, Chonbuk National University) ;
  • Jin, Zhenlan (Department of Physics Education and Institute of Fusion Science, Chonbuk National University) ;
  • Hwang, I.H. (Department of Physics Education and Institute of Fusion Science, Chonbuk National University) ;
  • Yeo, S.M. (KAERI (Korea Atomic Energy Research Institute)) ;
  • Han, S.W. (Department of Physics Education and Institute of Fusion Science, Chonbuk National University)
  • Published : 2013.08.21
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Abstract

We examined the temperature-dependent structural and magnetic properties of HgI2 in the temperature range of 300~400 K. HgI2 is a diamagnetic material and can be used for X-ray or γ-ray detectors. DCmagnetization measurements on HgI2 showed that there is a small but distinguishable change in its diamagnetic properties near 375 K. The magnetic property change is not expected because Hg and I are known as nonmagnetic elements. X-ray diffraction (XRD) measurements revealed a structural transition in the temperature of 350~400 K. Temperature-dependent x-ray absorption fine structure (XAFS) demonstrated that the chemical valence states of both Hg and I did not changed in the temperature range of 300~400 K. However, XAFS revealed that the bond-length disorder was slightly increased in the temperature range, particularly, near Hg atoms. The structural changes of HgI2 are likely related to its diamagnetic property change. We will discuss the relation between the diamagnetic properties and local structural properties of HgI2 in detail.

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