W掺杂量和退火温度对W-VO_(2)物相结构及相变性能的影响  

Effect of W doping content and annealing temperature on phase structure and phase transition performance of W-VO2

作　　者：孙恒辉 雷心瑜 袁新强[1,2] 蒋鹏[1,2] 张伟[1] 张立斋 SUN Heng-hui;LEI Xin-yu;YUAN Xin-qiang;JIANG Peng;ZHANG Wei;ZHANG Li-zhai(Department of Materials,Shaanxi University of Technology,Hanzhong 723000,China;National and Local Joint Engineering Laboratory for Slag Comprehensive Utilization and Environmental Technology,Shaanxi University of Technology,Hanzhong 723000,China;State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]陕西理工大学材料科学与工程学院,陕西汉中723000 [2]陕西理工大学矿渣综合利用环保技术国家地方联合工程实验室,陕西汉中723000 [3]西安交通大学材料力学行为国家重点实验室,陕西西安710049

出　　处：《材料热处理学报》2024年第2期44-52,共9页Transactions of Materials and Heat Treatment

基　　金：陕西省技术创新引导计划项目(2021CGBX-39);陕西理工大学2023年大学研究生创新基金项目(SLGYCX2303);2022年陕西省科技厅青年项目(2023-JC-QN-0476);2023年陕西省教育厅一般专项项目(23JK0375);2022年陕西理工大学人才启动项目(SLGRCQD2207);陕西省重点研发计划社会发展领域项目(2024SF-YBXM-638)。

摘　　要：钨掺杂M相二氧化钒(W-VO_(2)(M))有效降低了VO_(2)金属相(低温单斜相,M)到绝缘体相(高温四方金红石相,R)的可逆相转变温度(T_(c)),显著提高了VO_(2)在智能窗领域的应用价值。然而,W-VO_(2)(M)所表现出的较宽热滞回线宽度(ΔT_(c)>10℃)对其应用造成了一定的限制。为了解决这一问题,本研究以降低W-VO_(2)(M)的ΔT_(c)为目标,研究了W掺杂量与退火温度对W-VO_(2)物相结构及相变性能的影响。结果表明:随着W掺杂量的增加,W-VO_(2)粉体的T_(c)降低,并且ΔT_(c)较窄;退火温度的升高可以提高W-VO_(2)粉体的结晶度和分散度,但温度过高,会加速VO_(2)晶体结构的破坏,使其在恢复到室温后无法从R相转变为M相;当W掺杂量为6.0 at%,退火温度为700℃时,采用水热-退火两步法制备得到的W-VO_(2)(M)粉体表现出接近室温使用的T_(c)(T_(c)=36.83℃),同时具有较窄的ΔT_(c)(ΔT_(c)=6.63℃)。Tungsten doped M-phase vanadium dioxide(W-VO_(2)(M)) effectively reduces the reversible phase transition temperature(T_(c)) of VO_(2) from the metallic phase(low-temperature monoclinic phase,M) to the insulator phase(high-temperature tetragonal rutile phase,R),significantly improving the application value of VO_(2) in the field of smart windows.However,the large hysteresis width(ΔT_(c) >10 ℃) exhibited by W-VO_(2)(M) poses certain limitations to its application.To address this issue,this study aimed to reduce the ΔT_(c) of the W-VO_(2)(M),and the effect of W doping content and annealing temperature on phase structure and phase transition performance of the W-VO_(2) was studied.The results show that with the increase of W doping content,the T_(c) of the W-VO_(2) powder decreases,and ΔT_(c) is relatively narrow.An increase in annealing temperature can increase the crystallinity and dispersion of the W-VO_(2) powder,but if the temperature is too high,it will accelerate the destruction of the VO_(2) crystal structure,disabling the transition from R phase to M phase after returning to room temperature.When the W doping content is 6.0 at% and the annealing temperature is 700 ℃,the W-VO_(2)(M) powder prepared by the hydrothermal-annealing two-step method exhibits T_(c)(T_c=36.83 ℃) that is close to room temperature and a narrow ΔT_c(ΔT_c=6.63 ℃).

关 键 词：W掺杂 水热-退火两步法 W-VO_(2)(M) 智能窗 相变性能 

分 类 号：TB333[一般工业技术—材料科学与工程]