Structure cristalline de la phase Yb₂Fe₃O₇

Reinvestigation of the LuFeO3(ZnO)m Homologous Series: Insights from Charge Distribution Analysis on the Effect of the Coordination Polyhedra Shape on the Cation Distribution

“…From the YbFe O structure (3) two di!erent accretional homologous series can be derived, YbFeO (FeO) K , isostructural with the LuFeO (ZnO) K series, and (YbFeO ) L FeO, of which members corresponding to n"1 (3), n"2 (22,23), n"3, and 4 (24) have been reported. Also in this second series, the Yb is in octahedral coordination, and the Fe is in trigonal bipyramidal coordination.…”

“…Only for the "rst two members, however, has single-crystal structure re"nement been reported. The structure of two di!erent samples of the n"2 member are available (22,23). Within the limits of the quality of the structure re"nements (the error was on the second decimal of the bond distances), those two samples have two di!erent kinds of trigonal bipyramids for the Fe2 site: one has the same kind of distortion reported for the LuFeO (ZnO) K series and q/Q values similar to those reported here (Yb, 1.09; Fe1, 0.93; Fe2, 0.95), whereas in the other case (23) neither such distortion nor such unsatisfactory q/Q values (Yb, 1.02; Fe1, 0.96; Fe2, 1.00) are present (21).…”

Local structure and conduction mechanism in amorphous In–Ga–Zn–O films

“…6 On the other hand, InGaZnO 4 has a rhombohedral YbFe 2 O 4 structure ͑R3 គ m͒ with hexagonal lattice constants of a = 3.295 Å and c = 26.07 Å. 7 In the In 2 Ga 2 ZnO 7 crystal, three layers of InO 1.5 ͑U͒, M 2 O 2.5 ͑V͒, and MO 1.5 ͑W͒ units are repeated along the c-direction, 8 where M stands for either a Ga or Zn atom. In InGaZnO 4 , the MO 1.5 ͑W͒ layer is omitted and the InO 1.5 ͑U͒ and M 2 O 2.5 ͑V͒ layers are repeated.…”

Conductivity anomaly in CuInGaO4 and CuIn2Ga2O7 ceramics

“…The CuInGaO 4 GaO 4 at 1100 jC for 4 h or CuIn 2 Ga 2 O 7 at 1200 jC for 4 h. The powders were then mixed with approximately 5 wt.% organic binder and 12.5-mm-diameter pellets were prepared by cold uniaxial pressing. Finally, the pellets were sintered in air at temperatures ranging from 1100 to 1200 jC.…”

“…In the n = 1 structure, both Fe sites are equivalent. In the n = 2 structure, one of the Fe sites is occupied solely by Fe 3 + while the other Fe site has an average charge of Fe 2.5 + [4].…”