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ＭｇＯ－Ｂ２Ｏ３－ＳｉＯ２三元系１０００℃时，３５％≤ＭｇＯ％＜６０％组成范围内平衡相均为固相，其相关系可由Ｍｇ３Ｂ２Ｏ６－Ｍｇ２ＳｉＯ４－Ｍｇ２Ｂ２Ｏ５，Ｍｇ２Ｂ２Ｏ５－Ｍｇ２ＳｉＯ４－ＭｇＳｉＯ３，Ｍｇ２Ｂ２Ｏ５－Ｍｇ－ＳｉＯ３－ＳｉＯ２三个结线三角形表示．各平衡相量之间关系可应用ＸＲＤ定量相分析或重心规则计算．
MgO-B2O3-SiO2 ternary system at 1000 ℃, 35% ≤MgO% <60% of the composition of the equilibrium phase are solid phase, the correlation can be Mg3B2O6-Mg2SiO4-Mg2B2O5, Mg2B2O5-Mg2SiO4-MgSiO3, Mg2B2O5-Mg- SiO3-SiO2 three knotted triangle said. The relationship between the equilibrium phasor can be applied XRD quantitative phase analysis or center of gravity rules.