cer (pierwiatek); związki międzymetaliczne; obliczenia Ab initio; struktura elektronowa; własności termodynamiczne
Katowice : Uniwersytet Śląski
The aim of my doctoral thesis was comprehensive research on new
intermetallic compounds Ce₅MGe₂, where M is a metal with partial occupied 3d-,
4d- or 5d-electron shell. Only crystal structure was known for these compounds,
while their physical properties defining the ground state of the system have not been
studied so far. In this work, a several compounds of Ce₅MGe₂ were obtained, their
magnetic properties, specific heat, electric transport and the electronic structure (ab
initio calculations and XPS experiment) was investigated. The magnetic, thermal
and electron transport properties for the series of Ce₅MGe₂ compounds have been
systematized on the basis of their electronic structure, dominated by M and showed a
complex magnetic structure of these compounds.
Compounds were obtained in the form of polycrystalline Ce₅MGe₂ samples for
M = Ru, Rh, Pd Ag and Ce₂Rh₃Ge₂ by arc melting. The crystal structure was
examined by X-ray diffraction and the results were developed using the Rietveld
method. The electron structure was investigated by XPS Photoelectric Spectroscopy.
Magnetic measurements were performed using SQUID and PPMS magnetometer in
the fields range up to 7 T. Electrical resistance, thermal conductivity and specific
heat were investigated using a PPMS magnetometer. Calculations of the electronic
structure were also performed using the available codes.