Thermoelectric Properties of Zinc - Titanium - Doped Tungsten Trioxide Ceramics

As a new type of energy material, the thermoelectric material has a lower environmental pollution than the traditional petrochemical materials. It is a significant environment friendly material.

Thermoelectric material is mainly oxides, oxide thermoelectric materials can be divided into N, P, for the N type oxide material is mainly ZnO and TiO₂, were both a n type semiconductor material, it is also a kind of "d⁰" oxide, which has many characteristics at the same time. In order to enhance and strengthen the thermoelectric properties of N type oxides, some scholars have studied the synthesis effect of WO₃ ceramics doped with TiO2 and ZnO.

It is found that the conductivity of WO₃ ceramics can be significantly changed with the doping, and all electrical conductivity increases with the increase of temperature. With the continuous increase of TiO₂ doping concentration, the conductivity of the sample tends to become smaller and larger. The possible reason is that the second phase, which is produced in the smaller amount of doping, is ZnO_0.3WO₃, however, with the increase of doping concentration, the second phase changes into ZnO_0.06WO₃, and all the elements of the synthetic material have the same trend. This shows that ZnO and TiO₂ Co doped WO₃ based ceramics are still a kind of N type thermoelectric materials, and doping does not change the properties of WO₃ based ceramics as N type thermoelectric materials.

In conclusion, the power factor of WO₃ ceramics doped with ZnO and TiO₂ metal oxides has been improved, which is mainly attributed to their electrical conductivity of WO₃ ceramics to varying degrees. When the doping concentration of TiO₂ is 2mol, the electrical conductivity of WO₃ ceramics is the most obvious. The maximum power factor of 3 transition metal oxides was measured at 1023K, the experimental data show that the sample has good thermoelectric properties at high temperature.

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