Structural and Magnetic Properties of the Iridium Double Perovskites Ba(2-x)Sr(x)YIrO6.
The crystal structures of the series of ordered double perovskites Ba(2-x)Sr(x)YIrO6 (0 ≤ x ≤ 2) were refined using a combination of high-resolution synchrotron X-ray and high-intensity neutron diffraction data. The materials displayed a sequence of structures Fm3̅m(a(0)a(0)a(0)) (x = 0.6)--> I4/m(a(0)a(0)c(-)) (x = 1.0)--> I2/m(a(-)a(-)c(0)) (x = 1.4)--> P2(1)/n(a(-)a(-)c(+)) associated with increased tilting of the corner-sharing octahedra induced by increasing amount of the smaller Sr cation present. A similar sequence of transitions was induced by heating selected samples. Magnetic susceptibility measurements between 2 and 300 K showed no evidence for long-range magnetic ordering, an observation that was supported by neutron diffraction measurements, and rather strong spin-orbit coupling results in a Jeff = 0 ground state.
School of Chemistry, The University of Sydney , Sydney, New South Wales 2006, Australia.|Australian Nuclear Science and Technology Organisation , Lucas Heights, New South Wales 2234, Australia.|Australian Synchrotron , 800 Blackburn Road, Clayton, Victoria 3168, Australia.
Ben
B
Ranjbar
School of Chemistry, The University of Sydney , Sydney, New South Wales 2006, Australia.|Australian Nuclear Science and Technology Organisation , Lucas Heights, New South Wales 2234, Australia.|Australian Synchrotron , 800 Blackburn Road, Clayton, Victoria 3168, Australia.
Emily
E
Reynolds
School of Chemistry, The University of Sydney , Sydney, New South Wales 2006, Australia.|Australian Nuclear Science and Technology Organisation , Lucas Heights, New South Wales 2234, Australia.|Australian Synchrotron , 800 Blackburn Road, Clayton, Victoria 3168, Australia.
Paula
P
Kayser
School of Chemistry, The University of Sydney , Sydney, New South Wales 2006, Australia.|Australian Nuclear Science and Technology Organisation , Lucas Heights, New South Wales 2234, Australia.|Australian Synchrotron , 800 Blackburn Road, Clayton, Victoria 3168, Australia.
Brendan J
BJ
Kennedy
School of Chemistry, The University of Sydney , Sydney, New South Wales 2006, Australia.|Australian Nuclear Science and Technology Organisation , Lucas Heights, New South Wales 2234, Australia.|Australian Synchrotron , 800 Blackburn Road, Clayton, Victoria 3168, Australia.
James R
JR
Hester
School of Chemistry, The University of Sydney , Sydney, New South Wales 2006, Australia.|Australian Nuclear Science and Technology Organisation , Lucas Heights, New South Wales 2234, Australia.|Australian Synchrotron , 800 Blackburn Road, Clayton, Victoria 3168, Australia.
Justin A
JA
Kimpton