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非等摩尔比Sr(Ti,Zr,Y,Sn,Hf)O3-σ高熵钙钛矿氧化物的制备及电学性能研究
Preparation and Electrical Properties Study of Non-equimolar Sr(Ti,Zr,Y,Sn,Hf)O3-σ High-entropy Perovskite Oxide
  
DOI:
中文关键词:  高熵氧化物  钙钛矿结构  非等摩尔  电学性能
英文关键词:High entropy oxide  Perovskite structure  Non-equimolar  Electrical properties
基金项目:
作者单位
任贝,刘宇峰,孟子茜,程富豪,成楚飞,侯佳栋,马超,苗洋,王晓敏 太原理工大学材料科学与工程学院太原 030024 
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中文摘要:
      本研究采用非等摩尔混料结合两步法烧结制备了一系列非等摩尔比高熵钙钛矿氧化物Sr(Ti,Zr,Y,Sn,Hf)O3-σ。通过XRD、TG-DSC、SEM及TEM分析了其物相转变、表面形貌及晶体结构,并且采用电化学交流阻抗谱(EIS)对其电导率进行分析。研究结果表明Sr(Ti,Zr,Y,Sn,Hf)O3-σ在1480℃左右形成了单相钙钛矿结构,并且各元素分布均匀。在测试温度范围为300~750℃的条件下,Sr(Ti,Zr,Y,Sn,Hf)O3-σ单相钙钛矿结构稳定,其电导率符合阿伦尼乌斯方程,电导机理保持稳定。相较于其他三种高熵钙钛矿氧化物,Sr(Ti0.20Zr0.20Y0.20 Sn0.20Hf0.20)O3-σ(HEOY1)表现出最高的电导率,其750℃的电导率为3.55×10-3S/cm,与文献报道中的高熵钙钛矿氧化物的电导率(2.41×10-3S/cm)相比有较大提升。
英文摘要:
      In this study, a series of non-equimolar high-entropy perovskite oxide Sr(Ti,Zr,Y,Sn,Hf)O3-σ was prepared using a non-equimolar mixture combined with a two-step sintering method. The phase transition, surface morphology and crystal structure were analyzed by XRD, TG-DSC, SEM and TEM, and the conductivity was analyzed by electrochemical impedance spectroscopy(EIS). The results showed that Sr(Ti,Zr,Y,Sn,Hf)O3-σ formed a single-phase perovskite structure at around 1480℃ with uniform distribution of each element. Under the test temperature range of 300~750℃, the Sr(Ti,Zr,Y,Sn,Hf)O3-σ single-phase perovskite structure is stable, and its conductivity conforms to the Arrhenius equation, and the conductivity mechanism remains stable. Compared with the other three high-entropy oxides, Sr(Ti0.20Zr0.20Y0.20Sn0.20Hf0.20)O3-σ(HEOY1) exhibits the highest conductivity with a conductivity of 3.55×10-3S/cm at 750℃. There is a significant improvement compared with the conductivity of high entropy perovskite oxides reported in the literature (2.41×10-3 S/cm).
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