In applying the microwave radiation to extractive me-tallurgy,it is essential first of all to find the extent ofmicrowave energy absorbed by various minerals ex
1.IntroductionThe rhombohedral compoundSm<sub>2</sub>Fe<sub>17</sub>N<sub>x</sub>(x=1~3)is currently attractinginterest due to its promise as a new perma-nent magn