Lining Lan Shuhong Xie Li Tan Jiangyu Li
材料科学技术（英文）
Sol-gel based soft lithography technique has been developed to pattern a variety of ferroelectric Pb(Zr0:52Ti0:48)O3 (PZT) microstructures, with feature size approaching 180 nm and good pattern transfer between the master mold and patterned films. X-ray diffraction and high-resolution transmission electron microscopy confirm the perovskite structure of the patterned PZT. Piezoresponse force microscopy (PFM) and switching spectroscopy piezoresponse force microscopy (SSPFM) confirm their piezoelectricity and ferroelec-
tricity. Piezoresponse as high as 2.75 nm has been observed, comparable to typical PZT films. The patterned PZT microstructures are promising for a wide range of device applications.
关键词:
Soft lithography
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Piezoresponse force microscopy
,
PZT
李志宏
,
柳卫平
,
白希祥
,
郭冰
,
连钢
,
颜胜权
,
王宝祥
,
陆昀
,
曾晟
,
苏俊
原子核物理评论
doi:10.3969/j.issn.1007-4627.2005.01.006
利用8Li次级束测量了质心系能量7.8 MeV 2H(8Li, 9Li)1H反应的角分布, 导出了8Li(d, p)9Li反应的天体物理S因子及9Li→8Li+n虚衰变的渐近归一化系数.
关键词:
8Li(d,p)9Li反应
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角分布
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天体物理S因子
,
渐近归一化系数
HUANG Jianshun CHEN Junming Shanghai Institute of Metallurgy
,
Academia Sinica
,
Shanghai
,
China Research Associate
,
Shanghai Institute of Metallurgy
,
Academia Sinica
,
Shanghai 200050
,
China
金属学报(英文版)
Crystal structure of γ-Li_xFe_2O_3,inserted Li electrochemically,was studied by Moss- bauer spectroscopy together with X-ray diffraction,XPS and electrochemical method,On the insertion of Li at low current density,the crystal structure is keeping original spinel; while at higher current density or by thermal activation,owing to violent movement of Li~+ ions,part of crystal structure transforms into rock type similar to face-centered cubic structure of ferrous oxide.The transition channels during insertion of Li~+ ions and limitation of Li~+ ions inserted were discussed.
关键词:
null
,
null
,
null
江向平
,
胡晓萍
,
江福兰
,
刘晓冬
,
殷庆瑞
无机材料学报
doi:10.3724/SP.J.1077.2007.00465
利用固相反应法制备了(Na 0.52 K 0.48-x Li x)(Nb 0.86 Ta 0.10 Sb 0.04)O 3系无铅压电陶瓷, 研究了不同Li含量(x分别为0、0.02、0.04、0.06、0.08)样品的显微结构、物相组成及电性能. 结果表明, Li含量的改变对其物相组成、压电性能、铁电性能、介电性能都有显著影响. 当Li含量x从0增大到0.04时, 其压电性能相应提高, 当Li含量x超过0.04时, 压电性能明显下降; 在x=0.04时综合性能最好, 其压电常数d33高达260pC/N, 介电损耗tanδ为0.027, 平面机电耦合系数kp值达到50%, 剩余极化强度Pr为22μC·cm-2, 矫顽电场Ec为0.95kV·mm-1, 居里温度为316℃. 另外, 随着Li含量增加, 该系统的矫顽电场明显增强, 居里温度有所提高.
关键词:
铌钽酸钾钠
,
lead-free piezoelectric ceramics
,
piezoelectric properties
,
ferroelectric properties
,
dielectric properties
Journal of Materials Research
The effect of Li(3)N additive on the Li-Mg-N-H system was examined with respect to the reversible dehydrogenation performance. Screening Study with varying Li(3)N additions (5, 10, 20, and 30 mol%) demonstrates that all are effective for improving the hydrogen desorption capacity. Optimally, incorporation of 10 mol% Li(3)N improves the practical capacity from 3.9 wt% to approximately 4.7 wt% hydrogen at 200 degrees C, which drives the dehydrogenation reaction toward completion. Moreover, the capacity enhancement persists well over 10 de-/rehydrogenation cycles. Systematic x-ray diffraction examinations indicate that Li(3)N additive transforms into LiNH(2) and LiH phases and remains during hydrogen cycling. Combined structure/property investigations suggest that the LiNH(2) "seeding" should be responsible for the capacity enhancement, which reduces the kinetic barrier associated with the nucleation of intermediate LiNH(2). In addition, the concurrent incorporation of LiH is effective for mitigating the ammonia release.
关键词:
complex hydrides;improvement;mixtures;imides;amide;h-2
MANG Weishi WANG Guozhi ZHANG Yongchang HU Zhuangqi SHI Changxu Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China Yongchang Associate Professor
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
A rapidly solidified microcrystalline Al-Li-Cu-Mg-Zr alloy and its superplasicity have been investigated.An optimum tensile elongation of 585% was obtained at 540℃ and strain rate 1.67×10~(-2)s~(-1).The superplastic Al-Li alloy is manufaetured using thermomechanical pro- cessing:solution,overaging,warm rolling and recrystallization.Microstructural changes in thermomechanical processing and cavitation occurred during superplastic deformation have been observed.The superplastic failure of alloy may be caused mainly by nucleation and growth of cavities as well as the linkage around grains.
关键词:
superplasticity
,
null
,
null
,
null
江向平
,
胡晓萍
,
江福兰
,
刘晓冬
,
殷庆瑞
无机材料学报
doi:10.3321/j.issn:1000-324X.2007.03.018
利用固相反应法制备了(Na0.52K0.48-xLix)(Nb0.86Ta0.10Sb0.04)O3系无铅压电陶瓷,研究了不同Li含量(x分别为0、0.02、0.04、0.06、0.08)样品的显微结构、物相组成及电性能.结果表明,Li含量的改变对其物相组成、压电性能、铁电性能、介电性能都有显著影响.当Li含量x从0增大到0.04时,其压电性能相应提高,当Li含量x超过0.04时,压电性能明显下降;在x=0.04时综合性能最好,其压电常数d33高达260pC/N,介电损耗tanδ为0.027,平面机电耦合系数kp值达到50%,剩余极化强度Pr为22μC·cm-2,矫顽电场Ec为0.95kV·mm-1,居里温度为316℃.另外,随着Li含量增加,该系统的矫顽电场明显增强,居里温度有所提高.
关键词:
铌钽酸钾钠
,
无铅压电陶瓷
,
压电性能
,
铁电性能
,
介电性能
