New compounds of Yb₃Fe₄O₁₀ and Yb₄Fe₅O₁₃

Electronic ferroelectricity, charge ordering and structural phase transitions in LuFe2O4(LuFeO3)n (n = 0 and 1)

“…All phases contain the charge-frustrated W-layers in which equal numbers of Fe 2þ and Fe 3þ are expected to be ordered as discussed in LuFe 2 O 4 (n ¼ 0), while the n ¼ 1 and 2 phases also contains FeO 1.5 layers, which contain a single triangular net and are usually called V layers. However, we found it is really difficult to produce single-phase samples with n > 2 compound [12]; a mixture of phases is usually seen, and each has its own number of Fe/O and Lu/O sheets per unit cell, this synthetic intergrowth has made it difficult to do good physics experiments. In this paper, the ferroelectricity based on CO and structural phase transitions has been extensively investigated in LuFe 2 O 4 (LuFeO 3 ) n with n ¼ 0 and 1.…”

Synthesis of Rare Earth Iron‐Mixed Oxide Nanoparticles by Solvothermal Methods

“…However, the present product did not show any detectable weight increase in thermal analysis 26 . On the other hand, REFe 2 O 4 (RE=Dy–Lu and Y) 35 and a series of REFe 2 O 4 ·(REFeO 3 ) n ( n =1, 2, …, RE=Yb and Lu) 36–38 are easily prepared by solid state reaction of RE 2 O 3 and Fe 2 O 3 under controlled oxygen partial pressure (CO 2 /H 2 or CO 2 /CO). REFe 2 O 4 has a hexagonal layer structure formed by the alternate stacking of the two types of layers having the compositions of REO 3/2 (so called U layer) and Fe 2+ Fe 3+ O 5/2 (W layer).…”

“…All the Fe sites are crystallographically equivalent and the W layer is made up of two triangular sheets of corner‐sharing FeO 5 trigonal bipyramids (coordination structure of Fe is identical with that found in h ‐REFeO 3 ) 39 . The structures of REFe 2 O 4 ·(REFeO 3 ) n phases can be described by an alternate of REFe 2 O 4 and h ‐REFeO 3 blocks along the c ‐axis direction 37 . Matsui et al 38 reported, based on the structure image of Yb 3 Fe 4 O 10 obtained by a 1 MV high‐resolution electron microscope, that the three or more YbFeO 3 layers are often inserted between YbFe 2 O 4 layers.…”

Effect of Oxygen Partial Pressure on the Formation of Metastable Phases from an Undercooled YbFeO3 Melt Using an Aerodynamic Levitator

“…The peak patterns that were identified in the sample solidified at low P o 2 were also compared with those of the other compounds reported in the Yb–Fe–O system. Except for those of Yb 2 O 3 and YbFe 2 O 4 the peaks did not agree with those of other compounds, including Yb 3 Fe 4 O 10 and Yb 4 Fe 5 O 13 16 . On the other hand, due to the limitations of the experimental apparatus, a further decrease of P o 2 lower than 10 −1 Pa is quite difficult.…”