Effect of Sample Particle Size:

The particle size will cause a change within the diffusion of the evolved gases that will alter   the reaction rate and therefore the curve shape. The smaller the particle size and greater the extent of decomposition at any provided temperature. The use of large crystal might result in apparent vary rapid mass loss during heating. This may be because of the mechanical loss of part of the sample through forcible ejection from the sample container, while the accumulated evolved gases inside the coarse grains are suddenly released.