大冷变形对化学镀Ni-Sn-P非晶态合金晶化的影响

本文研究了大冷变形对化学镀Ni-Sn-P非晶合金晶化的影响,结果表明,冷变形促进了晶化,不仅降低了Ni-Sn-P非晶合金的热稳定性,而且在冷变形过程中就有晶化产生.     

高分子专业实验教学改革与思维创新能力培养研究

针对材料科学与工程实验教学的现状和问题,介绍了在高分子材料科学与工程专业建立独立的、知识和能力并重的实验教学新体系的设想和具体做法。经过四届本科生实验教学的改革与实践,证明这种实验教学新体系对培养学生的思维创新能力与工程实践能力有较大的促进作用。提出了思维创新系统工程学的概念、思维创新成果形式及对各形式的特点进行了概括与总结。     

Tl2Ba2Ca2Cu3O10的化学键性质和同质异能位移研究

在Tl2Ba2Can-1CunO2n 4(n=1,2,3,4)系列超导性氧化物中,Tl2Ba2Ca2Cu3O10具有最高Tc值(125 K)．利用电介质的平均能带模型计算了Tl2Ba2Ca2Cu3O10的局域化学键参数,得到Cu(1)-O键的共价性为0．561,Cu(2)-O键的平均共价性为0．296．应用化学环境因子计算了57Fe在Tl2Ba2Ca2Cu3O10中的穆斯堡尔同质异能位移,证实了57Fe在低掺杂时以Fe3 和Fe4 离子形式占据Cu(1)位置,而在高掺杂时以Fe3 和Fe4 离子形式分别占据Cu(1)和Cu(2)位置．结果表明,化学键理论计算有助于复杂晶体的穆斯堡尔谱的正确分析．     

Tl2Ba2Ca2Cu3O10的化学键性质和同质异能位移研究

Tl2Ba2Ca2Cu3O10 was reported to be a superconductor with a highest transition temperature of 125 K among the homologous series of Tl2Ba2Can-1CunO2n+4. The direct information on the Cu ion site at the atomic level is important for elucidating the superconductivity mechanism. The local bond properties of Tl2Ba2Ca2Cu3O10 were studied using the average band-gap model. The calculated results show that the covalency of Cu(1)-O bond is 0.561, and the average covalency of Cu(2)-O is 0.296. M(o)ssbauer isomer shifts of 57Fe in Tl2Ba2Ca2Cu3O10 were calculated using the chemical surrounding factor, defined by covalency and electronic polarizability. It is verified that for lower doping, Fe substitute the Cu at the Cu (1) site in forms of Fe3+ and Fe4+; for higher doping, Fe3+ and Fe4+ ion occupies Cu(1) and Cu(2) site respectively.The studies show that the determination of the correspondence between spectrum components and actual copper sites occupied by M(o)ssbauer nucleus was made easier with the aid of the calculation results of the chemical bond parameters.