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The catalytic hydrolysis of bis(4-nitrophenyl)phosphate (BNPP) by lanthanum(Ⅲ) ion in the presence of amino-alcoholic ligands: diethanolamine (DEA) and triethanolamine (TEA), was investigated kinetically at 30 ℃. The results indicated that the dinuclear dihydroxo complexes formed by lanthanum(Ⅲ) ion with aminoalcoholic ligands might be the catalytically active species which catalyze the hydrolysis of BNPP to different extents and the catalytic mechanism was believed to involve the synergism of double Lewis acid activation of the substrate and an intramolecular nucleophilic attack of a bridging oxo ligand. 相似文献
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HAN Wei ZHAO Kan WANG XianCheng LIU QingQing NING FanLong DENG Zheng LIU Ying ZHU JinLong DING Cui MAN HuiYuan JIN ChangQing 《中国科学:物理学 力学 天文学(英文版)》2013,56(11):2026-2030
We report discovery of ferromagnetism in(LaCa)(ZnMn)SbO isostructural to the well-studied iron-based superconductor LaFeAs(O1 xFx).Spin is induced by partial substitution of Mn2+for Zn2+,while charge is induced by substitution of Ca2+for La3+within the parent compound LaZnSbO.Ferromagnetism with Curie temperature(TC)is observed up to 40 K at the spin doping 0.15 by introducing Mn2+into the Zn2+sites for(La0.95Ca0.05)(Zn1 xMnx)SbO.The Hall coefficient measurement indicates p-type carrier for(La0.95Ca0.05)(Zn0.9Mn0.1)SbO with concentration of n~1020cm 3showing anomalous Hall effect below TC. 相似文献
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JianFa Zhao Li Peng Cao WenMin Li Jun Zhang GuangYang Dai Shuang Yu QingQing Liu XianCheng Wang GuoQiang Zhao YaTing Jia Lei Duan YouWen Long Hong-Ji Lin Chien-Te Chen Liu-Hao Tjeng ZhiWei Hu RunZe Yu ChangQing Jin 《中国科学:物理学 力学 天文学(英文版)》2019,(10)
正The discovery of high-temperature copper oxide superconductors(HTS)by Bednorz and Muller[1]in 1986 opened up a new field of superconductivity.Since then,several different families of materials have been discovered with greatly increased superconducting critical temperature(T_c)[2].Oxychloride cuprates,Ca_(n+1)Cu_nO_(2n)Cl_2,are one such type of 相似文献
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Zhao JianFa Cao LiPeng Li WenMin Zhang Jun Dai GuangYang Yu Shuang Liu QingQing Wang XianCheng Zhao GuoQiang Jia YaTing Duan Lei Long YouWen Lin Hong-Ji Chen Chien-Te Tjeng Liu-Hao Hu ZhiWei Yu RunZe Jin ChangQing 《中国科学:物理学 力学 天文学(英文版)》2019,62(10):1-5
We present a first-principles investigation on the dynamics and mechanism of the oxidation reaction between water molecules and the reduced PuO_2(110) surface using ab initio molecular dynamics(AIMD) simulations in combination with density functional theory(DFT) + U calculations. We find a dominating dissociation preference of water molecules for the vacancy defect sites on the PuO_2(110) surface, irrespective of the water or vacancy coverage. Due to hybridizations between the frontier orbitals of water molecule and the electronic states of the vacancy vicinity, partial water dissociation at the vacancy sites is exothermic and barrierless. The dissociation product, an OH group, further hydrogenates the PuO_2(110) surface by occupying the vacancy site.We also observe surface vacancy diffusion induced by the interactions between the water molecules and the surface oxygen atom in the proximity of the defect sites. 相似文献
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JIN ChangQing WANG XianCheng LIU QingQing ZHANG SiJia FENG ShaoMin DENG Zheng YU RiCheng ZHU JingLong 《中国科学:物理学 力学 天文学(英文版)》2013,56(12):2337-2350
In this article we briefly review new quantum functional compounds primarily based on our recent works.We will highlight the effects of pressures on both materials synthesis and quantum tuning.The contents include(I)"111"-type iron based superconducting system,(II)pressure induced superconductivity in topological insulators and(III)the new diluted magnetic semiconductors with decoupled spin charge doping. 相似文献
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