인공고관절의 세라믹 볼 헤드의 기계적 안정성 평가를 위한 3 차원 유한요소 해석

The response of the worldwide scientific community to the discovery in 2008 of superconductivity at T c = 26 K in the Fe-based compound LaFeAsO1−x F x has been very enthusiastic. In short order, ot...

The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides

Colossal magnetoresistance (CMR) phenomena are observed in the perovskite-type hole-doped manganites in which the double-exchange ferromagnetic metal phase and the charge–orbital ordered antiferromagnetic phase compete with each other. The quenched disorder arising from the inherent chemical randomness or the intentional impurity doping may cause major modifications in the electronic phase diagram as well as in the magnetoelectronic properties near the bicritical point that is formed by such a competition of the two phases. One is the phase separation phenomenon on various time-scales (from static to dynamic) and on various length-scales (from glass-like nano to grain-like micron). The other is the enhanced phase fluctuation with anomalous reduction in the transition temperatures of the competing phases (and hence in the bicritical-point temperature). The highly effective suppression of such a phase fluctuation by an external magnetic field is assigned here to the most essential ingredient of the CMR physics. Such profound and dramatic features as appearing in the bicritical region are extensively discussed in this paper with ample examples of the material systems specially designed for this purpose. The unconventional phase-controls over the competing phases in terms of magnetic/electric fields and photo-excitations are also exemplified.

https://iopscience.iop.org/article/10.1088/0034-4885/69/3/R06/pdf

Critical features of colossal magnetoresistive manganites

Manganese-activated fluoride phosphors for high-efficacy warm white light-emitting diodes have been limited by low photoluminescence quantum yields. Here, Zhu et al. use an efficient cation exchange reaction to synthesize manganese phosphors with photoluminescence quantum yields as high as 98%.

/pdf/highly-efficient-non-rare-earth-red-emitting-phosphor-for-3wgxp231in.pdf

Highly efficient non-rare-earth red emitting phosphor for warm white light-emitting diodes

The manipulation of magnetic properties by an electric field in magnetoelectric multiferroic materials has driven significant research activity, with the goal of realizing their transformative technological potential. Here, we review progress in the fundamental understanding and design of new multiferroic materials, advances in characterization and modelling tools to describe them, and the exploration of devices and applications. Focusing on the translation of the many scientific breakthroughs into technological innovations, we identify the key open questions in the field where targeted research activities could have maximum impact in transitioning scientific discoveries into real applications. Magnetoelectric multiferroics, where magnetic properties are manipulated by electric field and vice versa, could lead to improved electronic devices. Here, advances in materials, characterisation and modelling, and usage in applications are reviewed.

Advances in magnetoelectric multiferroics.

Magnetic structures and properties of .alpha.-chromium phosphate and .alpha.-chromium arsenate

Efficient photocatalytic hydrogen evolution over carbon supported antiperovskite cobalt zinc nitride

https://pubs.rsc.org/en/content/articlepdf/2019/cc/c8cc09612k

Ferri- and ferro-magnetism in CaMnMReO6 double double perovskites of late transition metals M = Co and Ni.

http://atarazanas.sci.uma.es/docs/articulos/16719517.pdf

J. Paul Attfield

Papers

Magnetic structures and properties of .alpha.-chromium phosphate and .alpha.-chromium arsenate

Efficient photocatalytic hydrogen evolution over carbon supported antiperovskite cobalt zinc nitride

Ferri- and ferro-magnetism in CaMnMReO6 double double perovskites of late transition metals M = Co and Ni.

Changes in Magnetic Couplings after Chimie Douce Reactions: Magnetic Structures of LiMnXO4(OD) (X=P, As)

Disorder effects on structural and electronic transitions in high tolerance factor manganite perovskites