Structure and polytypic faults in Ba4NdMn3O12 compound
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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 corner-sharing octahedra and the Mn ions located in the face-sharing 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….
KeywordsPerovskite Electron Diffraction Pattern TlCl BaO2 Close Packed Layer
This work was supported by the Foundation of Gansu Educational Committee (0703B-01), the Doctoral Research Grant of Lanzhou University of Technology (SB10200701), the Natural Science Foundation of Gansu Province (Grant Nos. ZS032-B25-019 and 3ZS061-A25-039), and State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials (Grant Nos. SKL07003 and SKL05009). R. C. Yu thanks the National Natural Science Foundation of China (Grant Nos. 10774168 and 50621061) and the State Key Development Program for Basic Research of China (Grant Nos. 2005CB623602 and 2007CB925003) for the support.
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