  The effects of annealing conditions upon the microstructure and the magnetic
properties of the colossal magnetoresistive manganite La0.75Sr0.25MnO3 have
been investigated. Increasing the annealing temperature and time of annealing
is seen to increase the size of crystallites within the samples. The
spontaneous magnetic moment per formula unit and the Curie temperature, as
obtained from Arrott plot analysis, are observed to depend upon the average
size of crystallites.
