Bayan-Obo ore diposit is known as a superlarge rare earth-niobium-polymetallic-iron ore deposit in theworld today.A great many of mineral species were found the
In-situ HVEM observation on phase transition of the YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub> superconducting compound in pro-cess of heating was carried out