Philosophical Magazine
The EPR g factors, g// and g perpendicular to, of tetragonally elongated and compressed CuIIN6 octahedral clusters (with the ground states |dx2 - y2 > and |dz2 >, respectively) in [image omitted] (MI = K, Rb, Cs; MII = Ca, Sr, Ba, Pb) crystals were calculated using a two-mechanism model. In the model, the contributions to the g-shifts, gi (= gi - gs, where i = // or perpendicular to; gs approximate to 2.0023 is the free-ion g value), from both the crystal-field (CF) mechanism related to CF excited states and the charge-transfer (CT) mechanism related to CT excited states, which is neglected in the widely-used CF theory, were considered. For the CF mechanism, two theoretical methods, the perturbation theory method (PTM) and the complete diagonalization (of energy matrix) method (CDM), were applied. The CF parameters used were calculated from the superposition model, in which the structural data for CuIIN6 clusters in [image omitted] crystals were measured exactly by X-ray diffraction. The calculated g factors for both the tetragonally elongated and compressed CuIIN6 octahedra are in reasonable agreement with the experimental values. For the strongly covalent CuIIN6 clusters in crystals with different ground states, both the PTM and CDM can be applied to calculate the g-shifts, [image omitted], arising from the CF mechanism, but exact and reasonable calculations of g factors should take both CF and CT mechanisms into account.
关键词:
crystal field;electron paramagnetic resonance;octahedral cluster;charge transfer;spin-hamiltonian parameters;atomic screening constants;jahn-teller;distortion;temperature-dependence;lead hexanitrocuprate(ii);2-mechanism model;scf functions;br crystals;complexes;bands
林玉芳
,
李蓉
,
张羊换
,
陈梅艳
,
王新林
功能材料
研究了Cu含量对MINi3.9-xCoo.4 Al0.2 Mno.6Cux贮氢合金的电化学性能的影响.实验发现:随着Cu含量x从0增加至0.3,合金的活化性能仍保持在2～3次;但合金的最大放电容量从344mAh/g下降到310mAh/g;高倍率放电性能均在81%以上;合金的循环寿命随着Cu含量的增加而有所提高的.实验表明,合金中加入适量的Cu,可有效的改善舍金的循环寿命.
关键词:
贮氢合金
,
Cu含量
,
电化学性能
王铭扬
,
田凤鸣
,
周林
,
张兴华
,
陈云琳
功能材料
doi:10.3969/j.issn.1001-9731.2016.05.011
采用水热法合成了金属-有机骨架材料 MIL-53(Al,Fe,Cr),并用 X射线衍射(XRD)、氮气吸/脱附等进行了测试表征.利用固定床吸附试验装置和气相色谱测定了在298 K,101 kPa 时,MIL-53(Al,Fe,Cr)对二氯甲烷、三氯甲烷的吸附情况.结果表明,二氯甲烷比三氯甲烷更易被MIL-53(Al,Fe,Cr)吸附,且 MIL-53(Al)对氯代甲烷的吸附能力最强,MIL-53(Cr)次之,MIL-53(Fe)最弱,MIL-53(Al)对二氯甲烷和三氯甲烷的吸附量最高分别可达16．88和7．11 mmol/g.实验结果与巨正则系综蒙特卡洛(GCMC)模拟结果一致.
关键词:
金属有机骨架
,
MIL-5 3
,
吸附
,
氯代
,
挥发性有机物(VOCs)
陈京兰
,
胡凤霞
,
高书侠
,
王中
,
高智勇
,
赵连城
,
宫声凯
,
徐惠彬
金属学报
研究了Ni52Mn24Ga24合金单晶在磁场作用下能产生的目前最大的磁致伸缩应变.发现了该材料的双向相变应变效应以及磁场对此的增强现象在1.2 T磁场的作用下,可逆的相变应变达4%以上.实现这一结果的关键条件是马氏体变体的择优取向报道了获得马氏体变体的择优取向样品的单晶生长特性和后处理方法.根据前人报道的理论模型分析了实验结果,指出磁感生应变的物理机制是磁场提供的Zeeman能驱动变体间孪晶界的移动.
关键词:
Ni52Mn24Ga24
,
null
,
null
陈京兰
,
胡凤霞
,
高书侠
,
王中
,
高智勇
,
赵连城
,
宫声凯
,
徐惠彬
金属学报
doi:10.3321/j.issn:0412-1961.2001.04.004
研究了Ni52Mn24Ga24合金单晶在磁场作用下能产生的目前最大的磁致伸缩应变.发现了该材料的双向相变应变效应以及磁场对此的增强现象在1.2 T磁场的作用下,可逆的相变应变达4%以上.实现这一结果的关键条件是马氏体变体的择优取向报道了获得马氏体变体的择优取向样品的单晶生长特性和后处理方法.根据前人报道的理论模型分析了实验结果,指出磁感生应变的物理机制是磁场提供的Zeeman能驱动变体间孪晶界的移动.
关键词:
Ni52Mn24Ga24
,
形状记忆
,
磁致伸缩
周萧明
,
胡更开
复合材料学报
doi:10.3321/j.issn:1000-3851.2004.06.026
提出了预测复合材料非线性电位移和电场强度关系的一种解析方法,该方法基于各向材料的割线介电常数,将非线性问题转化成一系列线性问题来求解.该方法适用于任意各向异性复合材料和组分材料的非线性性质,而常用的Stroud和Hui的模型只适用于各向同性复合材料和组分材料的弱线性.证明了本文方法具有Ponte Castaneda提出的变分结构.计算结果表明,当基体非线性较小时,本文模型的预测与Stroud和Hui的模型一致,但当基体非线性系数增大时,本文模型能给出合理的预测结果,而Stroud和Hui的模型则会超出基体和夹杂的性能范围.
关键词:
复合材料
,
介电常数
,
非线性
,
割线方法
Journal of Alloys and Compounds
The electrochemical properties of MINi(3.5)Co(0.8)Mn(0.4)Al(0.3) alloys with various Pr contents in MI were studied in this work, It was found that the Pr content in MI obviously affected the electrochemical properties of MI(Ni-Co-Mn-Al)(5) alloys. The electrochemical properties were greatly improved if the electrode alloy contained about 20 at.% Pr in MI. The electrode made from this alloy has a higher capacity, better discharge rate characteristics and longer cycle life than that from alloy with less than 10 at.% Pr in MI, as in common misch metal. The AA size cells in which electrode alloy contains about 17 at% Pr in MI are also studied. It was found that these cells have a very long cycle life (1400 cycles) with reasonable capacity (1250 mA h) and rate capability (1100 mAh) when discharged at 5 C). In particular, they have a very superior low temperature capability. For example, their capacity was higher than 1050 mA h when discharged at 1C and -18 degrees C.
关键词:
Pr;Ml;electrochemical properties;Ml-Ni alloys;hydrogen batteries;electrodes;hydrides;storage;lani5
