Two pellets were prepared by Spark Plasma Sintering (SPS)

The first is: UO2

The second is: UO2-10 Vol% MO

When calculating the density for them, it was found that the uranium dioxide pellet achieved a high density, with the average percentage of theoretical density (%TD) about 96.38 0.14%, while the measured density of the composite pellet (UO2-10 Vol% MO) showed a sharp drop in density about 92.11 0.23%.

What are the reasons for the decrease in the density of the compound corpuscle?

Please, explain the main and expected reasons in detail

Note: The answer should be written in "Word program", not in handwriting. Thanks