source:natureAbstractWe investigate the interplay of magnetization and lattice vibrations in rare-earth orthoferrites RFeO3, with a specific focus on non-symmetry-breaking anomalies. To do so, we study the magnetization, magnon excitations and lattice dynamics as a function of temperature in NdFeO3, TbFeO3, EuFeO3 and GdFeO3. The magnetization shows distinct temperature anomalous behavior for all investigated rare-earth orthoferrites, even in the compounds with no phase transitions occurring at those temperatures. Through spin–phonon coupling, these magnetic changes are mirrored by the FeO6 ro...
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2022
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source：chemeuropeSome raw materials are considered critical by the European Commission. These include many representatives from the rare-earth elements group, for which supply bottlenecks are imminent and no simple substitute options in technological applications exist. With currently no economically feasible mining operations in Europe, an important source is the recycling of electronic waste that contains considerable amounts of these metals. The downside: the process of concentrating the precious material in sizable amounts depends on environmentally harmful chemicals. Researchers at the He...
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2022
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source:sciencedailyStudying ancient ocean floors could help discover minerals needed to produce electric cars and solar panels.Researchers at The University of Queensland led a collaborative study that examined the remnants of ocean floors in eastern Australia and central Asia and applied a method to date the age of calcite trapped inside.Dr Renjie Zhou from UQ's School of Earth and Environmental Sciences said the findings could make it easier to source critical minerals used in renewable and clean technologies.'Calcite and other hydrothermal minerals are often observed in critical min...
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2022
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source：spectrumRecent reductions in loss ofhollow-core fibersmake them attractive for communication applications. Now a hollow-core fiberdescribed inNature Photonicson 30 May can transport a kilowatt of laser power up to a kilometer away. The development marks a big step for precision machining that requires high-power laser beams.Standard optical fibers—whether they’re being used for communications or machining—work by trapping light aimed along their length inside a solid glass core surrounded by a glass cladding with a lower refractive index. Any light that hits the cladding boundary is per...
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2022
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