高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (4): 511.

• 论文 • 上一篇    下一篇

立方相KNb0.77Al0.23O2.77的水热合成与输运性质研究

李广社1, 李莉萍2, 汪敏强1, 冯守华3, 姚熹1   

  1. 1. 西安交通大学电子材料研究所, 西安 710049;
    2. 吉林大学物理系, 长春 130023;
    3. 吉林大学无机合成与制备化学开放实验室, 长春 130023
  • 收稿日期:1998-06-16 出版日期:1999-04-24 发布日期:1999-04-24
  • 通讯作者: 李广社,男,31岁,博士后.
  • 作者简介:李广社,男,31岁,博士后.
  • 基金资助:

    国家自然科学基金(批准号:19804005);中国博士后科学基金(No.6570);吉林大学无机合成与制备化学开放实验室基金

Hydrothermal Synthesis and Transport Property of Cubic KNb0.77Al0.23O2.77

LI Guang-She1, LI Li-Ping2, WANG Min-Qiang1, FENG Shou-Hua3, YAO Xi1   

  1. 1. Electronic Materials Research Laboratory, Xian Jiaotong University, Xi'an, 710049;
    2. Physics Department, Jilin University, Chang chun, 130023;
    3. Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun, 130023
  • Received:1998-06-16 Online:1999-04-24 Published:1999-04-24

摘要: 用水热法合成了立方相KNb0.77Al0.23O2.77通过调整初始铌源和反应介质的KOH浓度,还得到了正交相钙钛矿和一新相化合物.立方相产物采用XRD、DSC和XPS进行表征.低于1000℃的热处理不能导致立方KNb0.77Al0.23O2.77发生结构相变.阻抗谱测量结果表明,离子输运机制归属于小极化子.而正交的同组分样品结构不稳定,在高温发生结构相变,导致电导率不连续.水热法得到的立方KNb0.77Al0.23O2.77可望成为新一代电解质材料.

关键词: 低温水热合成, 结构相变, 离子电导

Abstract: Cubic KNb0.77Al0.23O2.77is initially synthesized by low temperature hydrothermal synthesis, whereas high temperature ceramic method can only produce the orthorhombic phase of the parent KNbO3structure. By tuning the niobium species and KOH concentration, we have obtained orthorhombic KNbO3and an intermediate phase. The cubic product was examined by X-ray diffraction, differential scanning calorimeter, and X-ray photoelectron spectroscopy. High temperature treatment up to 1000 did not result in phase transition, reflecting a high structural stability. The transport mechanism can be ascribed to the small polarons. However for the orthorhombic counterpart, the discontinuty may be arised from the structural transformation due to the structuraLINstability.

Key words: Low temperature hydrothermal synthesis, Structural transition, Ionic conduction

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