Crystal structure and ionic conduction path of solid electrolytic materials by high temperature neutron diffraction method

Research of the distribution of oxide ions and the ionic conduction path of bismuth oxide (Bi2O3), cerium oxide (CeO2) and lanthanum gallate ((La0.8Sr0.2)(Ga0.8Mg0.15Co0.05)O3-δ) is stated. The high temperature neutron diffraction method, analytical method such as Rietveld method, crystal structure analysis of ionic conductor and MEM (Maximum- Entropy Method) are explained. The nuclear density distribution of oxide ions in bismuth oxide showed so larger distribution in the direction of <111> and <100> than Bi ions that the oxide ions conducted these direction in the crystal. The nuclear density distribution of oxide ions of cerium oxide indicated larger distribution in the direction of <111> than Ce ions and its tendency was remarkable at high temperature. Accordingly, the oxide ions conducted in the direction of <111> and <100>. The oxide ions distribution in lanthanum gallate compound was larger and complicated than positive ions. The oxide ions conducted to by describing an arc between the two stable positions. The nuclear density on the conduction path increased with increasing temperature. This above result corresponded to increase of oxide ion conductivity in the area. (S.Y.)