Errata

The liquid-phase epitaxial growth of Pb_1−xSn_x Te on PbTe (100) substrates has been investigated over a range of growth temperatures from 600-400°C, and has been found to produce material with good uniformity and reproducibility of carrier concen-tration and alloy composition. The assessment of the epitaxial layers by such techniques as x-ray diffraction, dislocation etching and thermo-electric power measurements is described. Various features of the epitaxial layers such as interface irregularity, dislocation and diffusion effects are discussed, and likely mechanisms for their existence are proposed. The hole concentrations of the epitaxial layers, obtained by thermoelectric power measurements, are shown to have a similar dependence on preparation temperature as for bulk annealed material, suggesting that native defects are the dominant source of carriers above~ 2×10* cm^-3. The online version of the original article can be found at     

激光致溅射沉积Ge2Sb2Te5薄膜的结晶行为研究

利用XRD研究了激光致溅射沉积Ge2Sb2Te5薄膜的结晶行为，研究发现，与热致相变不同的是，激光致相变只发生从非晶态到FCC晶态结构的转变，从FCC与HCP的结构转变不再发生，这有利于提高相变光盘的信噪比。Ge2Sb2Te5薄膜的结晶程度受初始化功率和转速的影响。     

添加Cu对WC－13％Fe／Co／Ni硬质合金性能与组织的影响

讨论了加入少量Ｃｕ对ＷＣ－１３％Ｆｅ／Ｃｏ／Ｎｉ硬质合金性能和组织的影响。叙述了在扫描电镜和透射电镜下，对该合金进行的金相观察和微观组织研究结果。结果表明，Ｃｕ有细化和球化ＷＣ晶粒的作用，当加Ｃｕ量为０．８％左右时，合金的性能最佳，其抗弯强度比未加Ｃｕ的合金高６７０Ｎ／ｍｍ２，可达到２３７０Ｎ／ｍｍ２。此外，合金在烧结后的缓冷过程中发生马氏体相变，其马氏体与γ相符合Ｋ—Ｓ取向关系。     

“均匀”还是“非均匀”辩析

简要地介绍了非均匀结构硬质合金制品的概念、应用及发展趋势。     

硬质合金小转子的研制

本文阐述了硬质合金小转子的研制过程 ,并就挤压模设计进行了探讨。实验结果表明 ,增塑粉末挤压是生产小口径硬质合金管材的有效途径。     

硬质合金表面刷镀技术及其应用

介绍了金属刷镀技术及其在YG牌号硬质合金工件表面的应用．对影响刷镀工艺的主要因素进行了研究，并提出了有关工艺参数的计算方法．     

Novel Hg<Subscript>x</Subscript>Cd<Subscript>1−x</Subscript>Te device structure for higher operating temperature detectors

A novel detector structure in which photons are absorbed in narrow-gap material, but the junction lies in wider bandgap material, has been examined. A possible reduction in bulk 1/f noise by a factor of 33 for a 240 K operation was predicted, based on studies that have suggested that the source of 1/f noise is the p-n junction and the large reduction in 1/f noise, which is observed in conventional detectors when the bandgap is increased. The increased bandgap at the junction produces a potential barrier; however, calculations are presented showing that for T > 150 K the thermal energy of the electrons enables them to cross the barrier and reach the p-n junction before recombining in the active region, thus giving high quantum efficiency. Experiments performed on the diodes showed that the quantum efficiency was maintained as expected, but the 1/f noise was not reduced, suggesting that it does not originate at the p-n junction. However, the structure does give excellent reverse-bias characteristics with low breakdown even at 2-V reverse bias.     

一种粉质粘土的微观分析

冶勒水电站土石坝坝址覆盖层基础内有一种粉质粘土，其物理性质与力学性质的关系相差甚远，用几种方法的测试结果进行微观分析，以释疑。     

等离子体刻蚀处理对金刚石膜粘附性能的影响

采用直流等离子体射流ＣＶＤ法在ＹＧ８质合金基体上成功地合成了多晶金刚薄膜。通常基体表面经金刚石磨盘研磨、稀硝酸化学侵蚀脱钴预处理后，沉积的金刚石薄膜的的粘附性能仍不理想。本文首次采用原位的Ａｒ－Ｈ２等离子体射流对基体表面进行适当的轰击、刻蚀处理，显著粗化了基体表面，并使基体表面显微组织和化学成分发生重大变化，并且在合适的沉积工艺条件下，沉积的金刚石膜的粘附性能显著提高。借助ＸＲＤ、ＳＥＥＭ、ＴＥＭ     

超细晶粒硬质合金复合粉的成形特征

采用沉降分离，高能剪切粉碎，比表面分析（BET）和扫描电镜（SEM）观察等手段研究了超细硬质合金粉末中的桥接团粒在分离，破碎过程中，松装密度和比表面的变化，研究和对比了常规湿磨、高速搅拌球磨、高速剪切粉碎对粉末成形致密化曲线的影响。结果表明：桥接团粒可被高速剪切粉碎机有效地粉碎。粉末的松装密度成倍地增长，并且压坯的相对密度由33．5％增加到60％。