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By employing thermal expansion measurement, the objectives of this thesis are to understand the unusual phase transition mechanism of Gd5(SixGei-x)4, the effect of impurities in starting material Gd on the its Curie point transitio~ etc. The main results are contained in two published papers. In the first paper, measurements of thermal expansion of single crystal Gds(Si1 _9sGe2.os) during cooling and heating were conducted for the first time. A very steep change in strain with temperature was observed when the material underwent a phase transformation. This was an unusual simultaneous magnetic and structural phase transformation from a ferromagnet with orthorhombic crystal structure below the transition temperature Tc to a paramagnet with monoclinic crystal structure above Tc• This transition temperature Tc was found to depend on magnetic field, and to exhibit hysteresis depending on whether the material was being cooled or heated. When the material was subjected to a magnetic induction B in the range O 2.5 Tesla, the transition temperatures, on both cooling and heating, were found to increase linearly with temperature by about 4.9 K/Tesla. This rate of change of transition temperature with magnetic field was in good agreement with calculations based on the assumption that the additional energy due to the magnetic field can suppress the thermal vibration of Gd atoms and that the additional thermal energy per Gd

Thermal expansion studies on the magnetic-crystallographic transformation of Gd5(Si[subscript x]Ge[subscript 1-x])4