Structures and electrochemical characteristics of Ti0.26Zr0.07V0.24Mn0.1Ni0.33Mox (x=0-0.1) hydrogen storage alloys

Microstructures and electrochemical properties of Ti0.26Zr0.07V0.21Mn0.1Ni0.33Mox (x=0,0.025,0.05,0.075, 0.10) electrode alloys have been investigated. The results of XRD analysis show that the alloys are mainly composed of V-based solid solution phase with body centered cubic (bcc) structure and C14 Laves phase with hexagonal structure. The addition of Mo element can imp ove the activation characteristics, maximum discharge capacity and cyclic durability for the electrode alloys

Mo掺杂对高纯Ce_(1-x)Nd_xO_(2-x/2)(x=0.10,0.15)体系烧结温度及晶界电性能的影响

用柠檬酸硝酸盐法制备高纯Ce1-xNdxO2-x/2(x=0.10,0.15)固溶体,加入摩尔分数为5%的Mo,研究了Mo掺杂对烧结温度、结构及电性能的影响.通过X射线衍射、电感偶合等离子体和场发射扫描电镜等手段对氧化物进行了结构表征,采用交流阻抗谱测试其电性能.柠檬酸硝酸盐法制备的前驱体经1450℃烧结24 h得到致密度大于96%的陶瓷材料;加入5%Mo,在1250℃下烧结8 h即可达到理想的致密度(>95%).加入Mo在烧结过程中可加快晶界迁移,促进晶粒生长,显著提高了晶界电导率.在600℃时Ce0.85Nd0.15O1.925的晶界电导率为2.56 S/m,加入Mo后材料的电导率增加到5.62 S/m.

Mo的掺杂对Ce_(0.8)Gd_(0.2)O_(1.9)烧结温度及电性能的影响

掺杂的CeO2基固体电解质因其在中低温条件下(500￣700℃)具有高氧离子电导率而成为有希望的IT-SOFCs(intermediate temperature-solid oxide fuel

Pr掺杂对Ce_(0.87)Sm_(0.13)O_(2-δ)结构及电性能的影响

采用溶胶-凝胶法合成Ce0.87Sm0.13-xPrxO2-δ(x=0.00,0.01,0.02)氧化物,通过X射线衍射、拉曼光谱、场发射扫描电镜对氧化物进行结构表征,利用交流阻抗谱测试电性能,并讨论了掺杂Pr对Ce0.87Sm0.13O2-δ微观结构和电性能的影响.结果表明,掺入少量Pr3+可减少或消除晶粒表面和晶界处的坑痕或孔隙,增加材料的致密性,从而降低材料的晶界电阻和电极界面电阻以及晶界电阻在总电阻中所占的比例,提高了材料的电导率.

Crystal structure of microwave dielectric ceramics Ba[(Mg1-xCdx)(0.33)Nb-0.67]O-3

A series of complex perovskite solid solutions of Ba[(Mg1-xCdx)(0.33)Nb-0.67]O-3 have been synthesized by the columbite method. Detailed Rietveld refinement of their X-ray diffraction data show that Ba[(Mg1-xCdx)0(.33)Nb(0.67)]O-3 has an order trigonal structure. The ordering degree as determined by the B-site occupancies increases with the partial substitution of Cd for Mg.

Microstructure and mechanical property of Mg-8.31Gd-1.12Dy-0.38Zr alloy

The Mg-8.31Gd-1.12Dy-0.38Zr (mass%) alloy was prepared by casting technology, and the microstructure, age hardening behavior and mechanical property have been investigated. It is noted that the alpha-Mg and the different Mg-RE (RE = Gd/Dy) compounds are subsistent in the as-cast and annealed state samples. The age hardening behavior is observed during the investigated temperature range, and the alloy exhibits high Vickers hardness, excellent ultimate tensile strength and yield strength at peak hardness.