B型BaTiO3（固相法）主含量≥99.7%BaO/TiO21±0.005Fe≤0.01%Mg≤0.01%Na≤0.01%Sr≤0.01%SiO2≤0.01%Al2O3≤0.01%LOI≤0.10%D500.2-2.0um(连续可调)