Interaction of the components in SrO–R2O3–MnOx systems
where R is a rare-earth metal of the
yttrium subgroup
Chem.
Met. Alloys 10 (2017)
18-29
https://doi.org/10.30970/cma10.0356
Oksana ZAREMBA,
Kateryna NAHIRNA, Roman GLADYSEHVSKII
The interaction of the components in the
systems SrO–R2O3–MnOx, where R = rare-earth metal of the yttrium subgroup, was
investigated based on the results of X-ray diffraction on polycrystalline
samples synthesized by solid-state reaction in air. In the system SrO–Tb2O3–MnOx,
for samples synthesized at 1000°Ñ, the
formation of the compound (Sr1‑xTbx)MnO3
with perovskite-type structure (structure
type CaTiO3, space group Pm‑3m, a = 0.3822(1) nm, RB = 0.155
for x = 0.75) was established.
In the system SrO–Dy2O3–MnOx, at the
temperature of synthesis 1100°Ñ, the existence of the following two compounds
was confirmed: (Sr1‑xDyx)2MnO4 (structure type
K2NiF4, space group I4/mmm, a = 0.3816(1),
c = 1.2356(5) nm, RB = 0.168
for x = 0.25), and (Sr1‑xDyx)MnO3 (structure
type CaTiO3, space group Pm‑3m, a = 0.3823(1) nm,
RB = 0.142
for x = 0.5). The
interaction of the components in the systems SrO–R2O3–MnOx,
where R = Er, Yb,
or Lu, for the temperature of synthesis 1000°Ñ, is characterized by the absence
of multinary phases and the equilibria
are formed between phases in the corresponding boundary systems.
Ñõåìà ôàçîâèõ ð³âíîâàã
ó ñèñòåì³ SrO–Tb2O3–MnOx çà
òåìïåðàòóðè ñèíòåçó 1000°Ñ
Keywords
Oxides / X-ray phase analysis / Phase equilibria / Crystal structure