????????? metatungstate ?? ???? ???????? ???????? ?? ??? ?????? ??????? ??????? ??????? ??????? ?? ?????? ????? ?? ????? ????? ???? ?? ???? ???? ???????? ?????? ???????? ?????. ???? ?????? ?? ?????? ???? ???? ????????? ????? ??? ?????? ???? ????? ????????.

??????? ??????????? ????????? ????? ???? ???????? ??? 220-280 ℃. ???? ??? ??? ???? ?????? ????????? ???? ????? ???????? ??? metatungstate ?????????. ???????? ????? metatungstate ????????? ??? 600 ℃ ??? ???? ?? ????????? ?????????? ?????? ??????? ??????? ??? ??????? ????? ???? ????? ??? ???? ???? ????? ????????.

????????? metatungstate ????? ???? ????? ???????? ?? ????? ?? ????? ??????? ??????? ?? ??????? ????. ???????? ???? ????? ???? ????????? ???? ???????? ???????? ????? matirials ???? ?????? ??? ???? ???? ?? ???????.

?????? ???????? ???? ????? ????? ??? calcinate ?????? ????? ???????? ?????? ???????? ???? ?????? ?????? ?????? ????? ????????. ??? ???? ???????? ????? ??? ?? ???????? ?????? ??? ????????? ???????? ???????? ???????? ?????? ??????? ??????. ??? ???? ?????? ??? ????? ?? ???????. ?? ????? ???? ?????? ??????? ????? ???????? ???? ???? ??????? ???????? ??????? ???????.