27 research outputs found
Traditional Owners of the Great Barrier Reef: the next generation of Reef 2050 actions
In short, this Report:
Confirms that there are two options for progressing the integration of Traditional Owner
interests in the Reef 2050 Plan.
Option 1 (Business As Usual) represents a continuation of the current approach of
Government-based review and refinement of the (now 23) Traditional Owner actions in
the Reef 2050 Plan.
Option 2 (Towards Genuine Co-governance) represents Government taking a far more
negotiated approach at the GBR-wide level (and subsequently down to local scales) that
applies the principles of Free Prior and Informed Consent.
Based on extensive engagement concerning the aspirations of Traditional Owners and
their support organisations across the GBR, the overwhelming stated desire and demand
is for genuine partnership in the overarching governance of the Reef and far deeper
ownership of, and participation in, its active day to day management (Option 2).
There is an unambiguous view that the foundations set in the Reef 2050 Plan (Option 1),
while a step in the right direction, simply reflect Traditional Owner aspirations in someone
else’s planning. Meanwhile, a consistent message from Traditional Owners, fuelled by
their existing and emerging rights in sea country, is that this more passive form of
involvement cannot continue into the future; that a genuine form of agreement making and
active implementation (from GBR to local scales) must emerge
Magnetocapacitance effect and magnetoelectric coupling in type-II multiferroic HoFeWO6
We have investigated the multiferroicity and magnetoelectric (ME) coupling in HoFeWO6. With a noncentrosymmetric
polar structure (space group Pna21) at room temperature, this compound shows an onset of electric
polarization with an antiferromagnetic ordering at the NĂ©el temperature (TN ) of 17.8 K. The magnetic properties
of the polycrystalline samples were studied by DC and AC magnetization and heat capacity measurements. The
metamagnetic behavior at low temperatures was found to be directly related to the dielectric properties of the
compound. In particular, field-dependent measurements of capacitance show a magnetocapacitance (MC) effect
with double-hysteresis loop behavior in direct correspondence with the magnetization. Our x-ray diffraction
results show the Pna21 structure down to 8 K and suggest the absence of a structural phase transition across TN .
Soft x-ray absorption spectroscopy and soft x-ray magnetic circular dichroism (XMCD) measurements at the
Fe L2,3 and Ho M4,5 edges revealed the oxidation state of Fe and Ho cations to be 3+. Fe L2,3 XMCD further
shows that Fe3+ cations are antiferromagnetically ordered in a noncollinear fashion with spins arranged 90â—¦ with
respect to each other. Our findings show that HoFeWO6 is a type-II multiferroic exhibiting a MC effect. The
observed MC effect and the change in polarization by the magnetic field, as well as their direct correspondence
with magnetization, further support the strong ME coupling in this compound.The work at University of Houston (UH) is supported
by U. S. Air Force Office of Scientific Research Grants
FA9550-15-1-0236 and FA9550-20-1-0068, the T. L. L. Temple
Foundation, the John J. and Rebecca Moores Endowment,
and the State of Texas through the Texas Center for Superconductivity
at the University of Houston. The XRD
patterns were collected at the National Synchrotron Radiation
Research Center at Taiwan. The synchrotron XAS/XMCD
experiments were performed at the BOREAS beamline of
the ALBA Synchrotron Light Facility in collaboration with
ALBA staff. Computational resources were provided by the
Extreme Science and Engineering Discovery Environment
(XSEDE) [55] supported by the National Science Foundation
(ACI-1548562) and the National Energy Research Scientific
Computing (NERSC) Center, a DOE Office of Science User
Facility supported by the Office of Science, U. S. Department
of Energy, under Contract No. DE-AC02-05CH11231.
Additional support for this work was provided through resources
of the uHPC cluster managed by UH and acquired
through NSF Award 1531814. The authors acknowledge the
use of the Maxwell/Opuntia/Sabine Cluster and the advanced
support from the Research Computing Data Core at UH. The
work at National Sun Yat-Sen University was partially supported
by the Ministry of Science and Technology of Taiwan
under Grant No. MOST 109-2112-M-110-019.Peer reviewe
Narrow Gap Semiconducting Germanium Allotrope from the Oxidation of a Layered Zintl Phase in Ionic Liquids
A metastable germanium
allotrope, GeÂ(oP32), was synthesized as
polycrystalline powders and single crystals from the mild-oxidation/delithiation
of Li<sub>7</sub>Ge<sub>12</sub> in ionic liquids. Its crystal structure,
from single crystal X-ray diffraction (<i>Pbcm</i>, <i>a</i> = 8.1527(4) Ă…, <i>b</i> = 11.7572(5) Ă…, <i>c</i> = 7.7617(4) Ă…), features a complex covalent network
of 4-bonded Ge, resulting from a well-ordered topotactic oxidative
condensation of [Ge<sub>12</sub>]<sup>7–</sup> layers. It is
a diamagnetic semiconductor (<i>E</i><sub>g</sub> = 0.33
eV), and transforms exothermically and irreversibly to α-Ge
at 363 °C. This demonstrates the potential of ionic liquids as
reactive media in the mild oxidation of Zintl phases to new highly
crystallized modifications of elements and simple compounds
Narrow Gap Semiconducting Germanium Allotrope from the Oxidation of a Layered Zintl Phase in Ionic Liquids
A metastable germanium
allotrope, GeÂ(oP32), was synthesized as
polycrystalline powders and single crystals from the mild-oxidation/delithiation
of Li<sub>7</sub>Ge<sub>12</sub> in ionic liquids. Its crystal structure,
from single crystal X-ray diffraction (<i>Pbcm</i>, <i>a</i> = 8.1527(4) Ă…, <i>b</i> = 11.7572(5) Ă…, <i>c</i> = 7.7617(4) Ă…), features a complex covalent network
of 4-bonded Ge, resulting from a well-ordered topotactic oxidative
condensation of [Ge<sub>12</sub>]<sup>7–</sup> layers. It is
a diamagnetic semiconductor (<i>E</i><sub>g</sub> = 0.33
eV), and transforms exothermically and irreversibly to α-Ge
at 363 °C. This demonstrates the potential of ionic liquids as
reactive media in the mild oxidation of Zintl phases to new highly
crystallized modifications of elements and simple compounds