INFLUENCE OF RELATIVE DENSITY AND PARTICLE-SIZE ON THE SPECIFIC-HEAT OF NANOCRYSTALLINE IRON

The specific heats of two nanocrystalline iron samples with different structures have been measured in the temperature range from 2 to 26 K. Experimental results show that the specific heat of nanocrystalline i ron samples exhibits abnormal characteristic compared with that of sta ndard bulk iron. The contributions of quantum size effect, surface mod e and Einstein mode have been observed in the measurement. Through ana lyses, it is discovered that the relative density and particle size ha ve a great influence on specific heat of nanocrystalline iron at low t emperature.