SOLID STATE PROPERTIES OF ALKALI-METAL SALTS OF 4-ELECTRON REDUCED 12-MOLYBDOPHOSPHIRIC ACID

摘要

Alkali-metal salts of 4-electron reduced 12-molybdophosphiric acid, M_xH(3-x)PMo_(12)O_(40)] (M=K,Rb,Cs; x=l,2,3)?nH_2O, were prepared by adding alkali-metal chloride solution after 4-electron reduction by ascorbic acid. Among them, Cs_3[H_4PMo_(12)O_(40)]?nH_2O showed the highest ac electrical conductivity (σ) of 7.4x10~(-4) Scm~(-1) at 300 °C. σ at 75 °C of M_3[H_4PMo_(12)O_(40)](M=K,Rb,Cs)?nH_2O is found to have a good linear relation against the ionic radius of alkali-metal.