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1.IntroductionAs mentioned in our previous paper[1],it is important to study the phase diagram ofthe system Nb_2O_5-MnO-SiO_2.The newcompound 4MnO·Nb_2O_5 has been ascer-tained in the binary system MnO-Nb_2O_5[1].Then,there are three stable compounds
1. Introduction paragraphs mentioned in previous paper [1], it is important to study the phase diagram of the system Nb 2 O 5 -MnO-SiO 2. The new compound 4MnO · Nb 2 O 5 has been ascer-tained in the binary system MnO-Nb 2 O 5 [1] .Then there are three stable compounds