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Current research topics of the Laboratory

 

The flyer of "Handbook of Nuclear Chemistry", edited by the members of our group can be seen here.
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Mössbauer spectroscopy:

  • colossal magnetoresistivity
  • high temperature superconductors
  • organometallic compounds
  • iron complexes in frozen solutions
  • corrosion
  • layered structures (Beatrice program for evaluating CEMS data of multilayers)

Positron annihilation spectroscopy:

  • structure and aging of polimer films used in medical science
  • drug carrier interactions in tablets
  • defect structures in alloys
  • structure of proteins in water solutions

Positronium chemistry:

  • positronium chemistry in solutions

 

History of research of the Laboratory
 

 

The research that began in 1958 covered the following topics:

  • Diffusion and self-diffusion by means of tracer methods
  • Measurement of soft ß-emitters by liquid scintillators
  • The study of water migration in soils with special respect to radioactive environmental contamination
  • In connection with the Chernobil accident, examination of 14C content of wines of different ages and origins
  • Chemical structure research with the aid of nuclear techniques started at the end of the 1960's.

Specifically,

  • Mössbauer spectroscopy began in 1967,
  • positron annihilation spectroscopy in 1969 and
  • meson chemistry in 1979.

These nuclear methods were first introduced into chemical research in Hungary at ELTE. These techniques as well as X-ray diffractometry have been applied at the Department in the following fields:

Mössbauer spectroscopy:

  • Study of the chemical structure of solutions on the basis of the Mössbauer spectra of frozen solutions.
  • Mössbauer studies in surface chemistry including the study of the chemical, magnetic, and crystal structure of electrodeposits, of surfaces of electrodes, of interphases between substrates and coatings (metal-metal, metal-organic coatings, etc.), of corroded surfaces and of ion implanted surfaces.
  • Investigation of the electronic and geometric structure of coordination compounds.
    Mössbauer spectroscopy of crystalline and amorphous iron alloys.
  • Identification of the chemical and crystal position of the Mössbauer active nuclides in aluminum alloys containing iron and tin impurities. (The HAS acknowledged the results of these studies with a prize in 1986.)
  • The Mössbauer effect was also applied to solve several industrial problems resulting in a number of industrial projects and some income for the University.
  • Study of high Tc superconductors.
  • Study of compounds containing buckminster-fullerenes and Mössbauer-active atoms.

Positron annihilation:

  • Study of the defect structure of metals and electrodeposits on the basis of the lifetime spectra of positrons.
  • Positron annihilation study of the phase transformation and structure of organic polymers and polymer layers.
  • Study of the surface of catalysts by the lifetime of the positronium formed in the free volume and on the surface of catalysts.
  • Positronium chemistry in liquids.
  • Positronium chemistry in solids.

Meson chemistry:

  • Study of hydrogen bonding with the aid of pi-mesons.

X-ray diffractometry:

  • Structure investigation and phase analysis of metals, alloys and compounds.
  • Structure determination and identification of probes used for positron annihilation and Mössbauer studies.

 

 

 

 

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Last update: 15-09-2005