First Identification Of Tetravalent Hf4+ Ion-Conducting Solid

A new tetravalent cation conductor, whose Hf4+ ion conductivity is the highest among the tetravalent ion-conducting solids and shows an extraordinary high and comparable conductivity to the representative divalent oxide anion conductor series, was artificially designed by strictly choosing the structure and the constituent elements. Since the solid electrolyte shows considerable high ion-conducting characteristics, promising applications like rechargeable batteries and chemical sensors for an environmental gas monitoring are greatly expected. (C) 2002 Elsevier Science B.V. All rights reserved.