Effects of TiO2 doped to basalt on producing continuous fiber and their electrical properties

•The basalt with 6.44% TiO2 could not be prepared into continuous fiber because of the Rayleigh instability.•The dielectric properties of basalt glass doped with TiO2 can be well explained by the degree of glass polymerization.•0.83 ∼ 6.44 wt% TiO2 addition agent do not cause the crystallization of basalt glasses.•Compared with diffuse reflection infrared testing, Raman is suitable to test the surface structure of the polished glass block. The Emeishan basalt in China could be classified as high and low TiO2 level. However, the effect of TiO2 on producing continuous basalt fiber and their electrical properties remained unknow. XRD, FT-IR, and Raman were used to determine the structure of basalt glasses with 0.83∼6.44 wt% TiO2. TiO2 did not cause the crystallization of basalt glasses according to XRD data. The Raman results revealed that the glass network was loose when the samples contained 4.64 wt% TiO2. Due to the loose glass network, the dielectric constant and loss exhibited the highest values, which was 9.8 and 0.016 respectively. The higher the TiO2 concentration was, the lower the volume resistivity was. Continuous basalt fibers with diameters ranging from 9 μm to 11 μm could be produced by basalt with 0.83∼4.64 wt% TiO2.The basalt with 6.44% TiO2 could not be prepared into continuous fiber because of the Rayleigh instability