Solid-phase synthesis of low-temperature phase V1-xMoxO2-yFy(M)and its optical thermal insulation properties
In order to solve the demand for green energy-saving production technology for the practical applica-tion of low-temperature thermally induced phase change VO2(M)smart window materials,the synthesis process of VO2(M)synthesis by solid-phase method was optimized with the help of eccentric vibration mill as pretreatment and dispersion equipment and using V2O5 and piperic acid as raw materials.The preparation process of Mo/F co-doped low-temperature thermally induced phase change V1-x Mox O2-y Fy material and the phase transition regulation law of VO2(M)by Mo/F content were studied,and its optical and thermal insula-tion properties were evaluated.The results showed that pure phase VO2(M)could be obtained at the grinding time of 10 min/10.0 g raw materials and the roasting temperature of 750 ℃.With ammonium molybdate and ammonium fluoride as Mo/F co-doped raw materials,a low-temperature thermally induced phase transition V1-xMoxO2-yFy(M)with a regular decrease in phase change temperature with the dosage can be obtained,and the VO2(M)phase transition temperature is reduced to 38.20 ℃ after doping of 2at％Mo and 3at％F.The parti-cle size of VO2(M)and V1-xMox O2-yFy(M)is about 300 nm,and the thermal return width(△Tc)is between 6.1-7.9 ℃,showing sensitive thermally induced phase transition ability.V1-1 Mo,O2-yFy(M)/PVB composite film has a visible light transmittance of 48.7％,which has a good thermal insulation effect.
eccentric vibrating millMo/F dopingvanadium dioxidesmart windows
万方数据
