PREPARATION, IONIC-CONDUCTIVITY, AND HUMIDITY-SENSING PROPERTY OF NOVEL, CRYSTALLINE MICROPOROUS GERMANATES, NA3HGE7O16.XH2O, X = 0-6 .1.

被引：32

作者：

FENG, SH ^{[1
]}

TSAI, MT ^{[1
]}

GREENBLATT, M ^{[1
]}

机构：

[1] RUTGERS STATE UNIV,DEPT CHEM,NEW BRUNSWICK,NJ 08903

来源：

CHEMISTRY OF MATERIALS | 1992年 / 4卷 / 02期

关键词：

D O I：

10.1021/cm00020a029

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A crystalline microporous germanate, Na3HGe7O16.6H2O, has been hydrothermally synthesized from a Na2O-GeO2-H2O system. This phase undergoes a phase transition to Na3HGe7O16.xH2O, x = 0-4 at approximately 160-degrees-C. Both phases of the sodium germanates have been characterized by powder X-ray diffraction and differential thermal and thermogravimetric analyses. Sodium and proton ionic conductivities in Na3HGe7O16.6H2O, Na3HGe7O16.4H2O, and dehydrated Na3HGe7O16 were studied by an ac impedance technique. In Na3HGe7O16.6H2O motion of surface, bulk proton, and Na+ ion respectively dominate the conductivity in different temperature ranges. The conductivity in dehydrated Na3HGe7O16 is approximately 10(-8) (OMEGA-cm)-1 at 125-degrees-C and approximately 10(-3) (OMEGA-cm)-1 at 500-degrees-C with an activation energy E(a) = 0.64 eV. Humidity-sensing property of Na3HGe7O16.6H2O and Na3HGe7O16.4H2O was investigated in the temperature range 50-120-degrees-C.

引用

页码：388 / 393

页数：6

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