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High‐Pressure Synthesis and Magnetic Behavior of A‐Site Columnar‐Ordered Double Perovskites, LnMn(Ga 0.5 Ti 0.5 ) 2 O 6 (Ln = Sm, Gd)
A‐site columnar‐ordered double perovskites, LnMn(Ga 0.5 Ti 0.5 ) 2 O 6 (Ln = Sm, Gd), were successfully synthesized under high pressure and high temperature (6 GPa, 1375 K). From the synchrotron powder X‐ray diffraction patterns, all of the diffraction peaks can be indexed by the P 4 2 / nmc space g...
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| Published in: | European journal of inorganic chemistry 2017-01, Vol.2017 (4), p.835-839 |
|---|---|
| Main Authors: | , , , |
| Format: | Article |
| Language: | English |
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| Online Access: | Get full text |
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| Summary: | A‐site columnar‐ordered double perovskites, LnMn(Ga
0.5
Ti
0.5
)
2
O
6
(Ln = Sm, Gd), were successfully synthesized under high pressure and high temperature (6 GPa, 1375 K). From the synchrotron powder X‐ray diffraction patterns, all of the diffraction peaks can be indexed by the
P
4
2
/
nmc
space group with lattice parameters
a, c
≈ 2
a
p
(
a
p
: primitive cubic perovskite lattice) and no ordering of the
B
‐site cations. Rietveld analysis of the synchrotron powder X‐ray diffraction patterns and Curie–Weiss fitting of their magnetizations reveal that the ionic formulae of these perovskites are Ln
3+
Mn
2+
(Ga
3+
0.5
Ti
4+
0.5
)
2
O
2–
6
. SmMn(Ga
0.5
Ti
0.5
)
2
O
6
shows canted‐antiferromagnetic behavior, whereas GdMn(Ga
0.5
Ti
0.5
)
2
O
6
exhibits two different magnetic states at low temperature depending on the applied magnetic field and shows an unusual magnetization curve. These magnetic behaviors originate by decreasing the antiferromagnetic interaction by substituting Ga
3+
(
d
10
) for Ti
4+
(
d
0
) and by decreasing the ferromagnetic interaction between columnar‐ordered Ln
3+
and Mn
2+
. |
|---|---|
| ISSN: | 1434-1948 1099-0682 |
| DOI: | 10.1002/ejic.201601392 |