PREPARATION OF AG(I) AND CU(II) EXCHANGED ALPHA-ZIRCONIUM PHOSPHATE BY USING MOLTEN NITRATE SALTS AND THEIR ELECTRIC CHARACTERIZATION

摘要

Fully exchanged anhydrous silver form, Zr(AgPO4)2 and partially exchanged Cu form of alpha-ZrP were prepared by treating molten state of AgNO3 and Cu(NO3)2 with crystalline alpha-ZrP and semicrystalline ZrP gel. Conductivity measurement was carried out at 10-300 degrees C using pulse and dc methods to separate ionic and electronic contribution of the total conductivity. Ag ion exchanged ZrP showed ionic conductivity mainly, because low coordination number and covalent bonding of the Ag ion causes weak coulombic interaction with oxygen anions around the cation. The conductivities were in the range of 10(-7) to 10(-4)Ohm(-1). cm(-1). The crystallinity in this system did not influence the conductivity much. On the other hand, Cu ion exchanged ZrP had electronic conductivity mainly in the range of 10(-7) to 10(-)5 Ohm(-1). cm(-1). The electronic conducting was different depending on the extent of Cu ion exchange. The semiconducting property of Cu form of alpha-ZrP can be explained by d-p-d orbital overlap in Cu-O-Cu bonding. [References: 11]