A series of samples of alumina-siloxane gel wrapped by poly(methyl methacrylate)and doped with rare earths such as lanthanum,praseodymium,yttrium,gadolinium and
The phosphorite ores-deposits rich in rare earth elements(REE) in Zhijin, Xinhua, Guizhuo occurs in the early Cambrian Meishucun and at the bottom part of Qiong