PREPARATION OF COPPER NIOBATES BY THERMAL-DECOMPOSITION OF FREEZE-DRIED COMPLEX OXALATE SOLUTIONS

被引：14

作者：

LANGBEIN, H

WOLKI, G

机构：

[1] Institute for Inorganic Chemistry, Dresden University of Technology, 01062, Mommsenstr

来源：

THERMOCHIMICA ACTA | 1995年 / 264卷

关键词：

COPPER NIOBATES; CU-NB-OXALATE PRECURSOR; MASS SPECTROMETRY; PHASE ANALYSIS; THERMAL ANALYSIS;

D O I：

10.1016/0040-6031(95)02348-6

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Freeze-dried complex oxalates of copper and niobium are reactive precursors for ternary copper niobium oxides. The thermal decomposition of the amorphous precursors has been investigated by DTA, TG and mass spectroscopy. The gaseous decomposition products are assigned to steps in the TG graph. Above 500 degrees C, crystallization of complex oxides takes place. In the temperature range up to 900 degrees C, only the ternary phases CuNb2O6 and Cu3Nb2O8 can be synthesized. The thermal decomposition of the oxalate precursor is advantageous with regard to the preparation of pure monoclinic CuNb2O6. The transformation between monoclinic and orthorhombic CuNb2O6 is reversible with a high activation energy of transformation.

引用

页码：67 / 73

页数：7

共 6 条

[1] PREPARATION OF CUNB2O6 AND CUTA2O6 [J].