材料期刊网

用反应48Ca+254Es合成119号元素的可能性研究

沈彩万 , Yasuhisa Abe , David Boilley

原子核物理评论 doi:10.11804/NuclPhysRev.30.03.284

利用最近发展起来的两步模型分析重离子核反应48Ca+254Es的熔合过程.在这个模型中,熔合过程被分为前后独立的两个过程,即粘连过程和形成过程.本研究组计算了对应的粘连概率和形成概率,并结合适用于蒸发过程的统计蒸发模型,计算了该反应合成119号超重元素的剩余截面,即当Elab=250.2 MeV时,...

关键词: 超重核 , 热熔合 , 粘连概率 , 形成概率 , 剩余截面

Enhanced H-storage property in Li-Co-N-H system by promoting ion migration

Journal of Alloys and Compounds

Motivated by the ion migration mechanism proposed by David et al. [J. Am. Chem. Soc. 129 (2007) 1594-1601], we mechanically mill the Li3N/Co powder mixture to obtain defective Li3N-type structure with enhanced Li+ mobility. Compared with Li3N the hydrogen storage prope...

关键词: Hydrogen absorbing materials;Nitride materials;hydrogen-storage;lithium amide;mechanism;nitride;batteries;mixtures;hydride;imides;linh2;anode

Y4Si2O7N2: A New Oxynitride with Low Thermal Conductivity

Journal of the American Ceramic Society

Search for new thermal barrier materials with high-temperature stability is very difficult because there are intractable choices among thousands of possible candidates. The present paper shows that identifying and developing new low thermal conductivity materials can be accomplished by first-princip...

关键词: theoretical elastic stiffness;barrier coatings;mechanical-properties;gas;gamma-y2si2o7;crystal;y2sio5;system;phase;si3n4-sio2-y2o3

Theoretical elastic stiffness, structural stability and thermal conductivity of La(2)T(2)O(7) (T = Ge, Ti, Sn, Zr, Hf) pyrochlore

Acta Materialia

In order to achieve better understanding of the structural/property relationships of La(2)T(2)O(7) (T = Ge, Ti, Sn, Zr, Hf) pyrochlore, first-principles calculations were conducted to investigate the bonding characteristics, elastic stiffness, structural stability and minimum thermal conductivity. T...

关键词: Non-binary oxides;Mechanical properties;Thermal conductivity;Density;functional theory;Local density approximations (LDA);oxide pyrochlores;a(2)b(2)o(7);simulation;disorder