Author/Authors :
H. Yang، نويسنده , , Z. E. Cao، نويسنده , , X. Shen، نويسنده , , W. J. Feng · R. K. L. Su · E. Pan، نويسنده , , J. L. Jiang، نويسنده , ,
J. F. Dai، نويسنده , , R. T. Liu and R. C. Yu، نويسنده ,
Abstract :
We have studied the structure and polytypic
defect formation in the 12R perovskite-type Ba4NdMn3O12
compound. Its structure was characterized using transmission
electron microscopy (TEM). Like in the 12R ordered
oxides of Ba4CeMn3O12 and Ba4PrMn3O12 (Fuentes et al.,
J. Solid State Chem. 177 (2004) 714), a cationic ordering
between Nd and Mn is also expected to be established in
Ba4NdMn3O12 with the Nd ions located in the cornersharing
octahedra and the Mn ions located in the facesharing
octahedra. We also observed in the Ba4NdMn3O12
phase two types of polytypic faults, i.e., the extrinsic hexagonal-
type fault with the stacking sequence …cchhhcc…
and the extrinsic cubic-type fault with the stacking sequence
…hhccchh….
