Preparation and crystallographic data of the pyrochlores Gd2MSbO7 (M = Cr,Mn, Fe, In)

Synthesis, X-ray Rietveld analysis, infrared and Mössbauer spectroscopy of R 2 FeSbO 7 (R 3+ = Y, Dy, Gd, Bi) pyrochlore solid solution

“…However, for Gd 2 FeSbO 7 the above ratio is slightly larger than the earlier reported value in Ref. [7], which may be due to presence of some impurity in our sample. A low-intensity impurity peak at 2θ = 32.87° was detected in the XRD profile for Gd-sample which could be assigned to the most intense reflection from (121) plane of orthorhombic GdFeO 3 (JCPDS # 780451) present as impurity (<3-4%) in Gd 2 FeSbO 7 powder.…”

“…Literature review showed that though R 2 3+ M 2 4+ O 7 are well studied so far and reviewed in detail in Refs. [1][2][3], the synthesis, structural analysis and study of the physical properties of the pyrochlores with mixed cations at M sites are very few [6][7][8]. In this context, we report in this work the synthesis of few iron containing pyrochlores, R 2 Fe 3+ Sb 5+ O 7 (R 3+ = Y, Dy, Gd, Bi) via thermal route of solid-state reaction method.…”

Decomposition behavior of Ln2Mn4/3W2/3O7 (Ln = Eu and Er) in reducing atmosphere and their thermodynamic properties

“…The synthesis of the samples was performed as follows: the mixtures of Er 2 O 3 , Mn 2 O 3 , and WO 3 with various cation ratios were heated at 1623 K in a 1% H 2 -Ar gas flow for 48 h. The XRD pattern obtained from the sample only with Er : Mn : W 2 : 1 : 1, which is shown in Fig. 4( b) The samples in regions B and C contained Er 6 WO 12 , but this does not appear in reaction (6). The reaction which includes Er 6 WO 12 as a decomposition product is considered to be …”

“…Most of these compounds have the pyrochlore structure with a cubic cell [1][2][3][4][5][6][7] and some of the compounds have the distorted pyrochlore structure with a rhombohedral (or hexagonal) cell. [8][9][10] In the Ln-Mn -W-O system, Ln 2 Mn 4/3 W 2/3 O 7 (Ln Sm-Lu and Y) were first synthesized by Bazuev et al 11 They reported that the powder x-ray diffraction patterns of those compounds could be indexed by hexagonal symmetry, and also reported the magnetic susceptibility of Y 2 Mn 4/3 W 2/3 O 7 .…”

Structural analysis of complex oxides Ln2MnTa1+xO7+δ (Ln = rare earth and yttrium) with pyrochlore-related structures

“…Complex oxides A 2 B 2−x B x O 7 with a pyrochlore and its related structure have been studied by many researchers [1][2][3][4][5][6][7] from interesting physical and chemical properties by various combinations of rare earth (Ln) ions and transition metal (B, B ) ions. Mn-containing compounds Ln 2 Mn 2 O 7 (Ln = rare earth and Y) are prepared only under high pressure [8], but some compounds such as Ln 2 Mn 2−x M x O 7 , (M = W, Mo, Ta and Nb) could be synthesized: Y 2 Mn 2/3 Ta 4/3 O 7 and Y 2 MnTaO 7 were synthesized in a reducing atmosphere and in air, respectively, by Bazuev et al [6,7].…”