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Magnetic materials featuring triangular arrangements of spins are frequently investigated as platforms hosting magnetic frustration. Hexagonal perovskites with ordered vacancies serve as excellent candidates for two-dimensional triangular magnetism due to the considerable separation of the magnetic planes. In this work, the effects of chemical pressure on the ferromagnetic ground state of Ba 2 La 2 NiW 2 O 12 by substitution of Ba 2+ with Sr 2+ to produce Sr 2 La 2 NiW 2 O 12 are investigated. The two materials are characterized using synchrotron-based XRD, XANES and EXAFS in addition to magnetometry in order to correlate their crystal structures and magnetic properties. Both materials form in space group R 3 , yet as a result of the enhanced bending of key bond angles due to the effects of chemical pressure, the T C value of the magnetic Ni 2+ sublattice is reduced from ∼6 K in Ba 2 La 2 NiW 2 O 12 to 4 K in Sr 2 La 2 NiW 2 O 12 .
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Smerechuk et al. (2024) studied this question.
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