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

Chem. J. Chinese Universities ›› 1999, Vol. 20 ›› Issue (4): 511.

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Hydrothermal Synthesis and Transport Property of Cubic KNb_0.77Al_0.23O_2.77

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

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

Abstract

Abstract: Cubic KNb_0.77Al_0.23O_2.77is 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

CLC Number:

O611.4

TrendMD:

LI Guang-She, LI Li-Ping, WANG Min-Qiang, FENG Shou-Hua, YAO Xi . Hydrothermal Synthesis and Transport Property of Cubic KNb_0.77Al_0.23O_2.77[J]. Chem. J. Chinese Universities, 1999, 20(4): 511.

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Hydrothermal Synthesis and Transport Property of Cubic KNb_0.77Al_0.23O_2.77

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