ELECTRICAL-CONDUCTIVITY OF AMMONIUM DIHYDROGEN PHOSPHATE CRYSTALS WITH REGARD TO CRYSTAL-STRUCTURE AND THERMAL-ANALYSIS

被引：20
作者：
ABDELKADER, A
机构：
[1] Physics Department, Faculty of Science, Menoufia University, Menoufia
来源：
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS | 1991年 / 2卷 / 01期
关键词：
D O I：
10.1007/BF00694996
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Single crystals of ammonium dihydrogen phosphate (ADP) were grown from supersaturated aqueous solution by a slow evaporation technique. The crystal structure of these crystals was investigated by X-ray diffraction (XRD). The ADP crystals showed an ohmic behaviour up to 800 volts with a resistivity of 4.6 x 10(6) OMEGA cm at room temperature. The electrical conductivity temperature dependence showed two distinct regions separated by a knee at 92-degrees-C. Below the knee, the conductivity is slightly temperature dependent while above the knee it is highly temperature dependent. The values of activation energy were estimated as 0.480 eV and 0.135 eV above and below the knee, respectively. The conduction processes above and below the knee were explained by the mechnism of phosphate group rotation and proton jump, respectively. Thermal analysis as well as XRD confirmed the knee temperature.
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页码：7 / 10
页数：4
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