掺锌（100）GaSb单晶的生长

采用LEC方法研制出掺锌(100)GaSb单晶;用霍尔测量法算出的锌掺杂浓度计算得出锌的有效分凝系数keff约为0.84±0.01,沿晶体生长方向随着锌浓度的提高,位错密度缓慢增加,数值约为(2～3.2)×103cm-2,当掺锌浓度大于3×1019cm-3以后,GaSb发生简并,载流子浓度随掺锌浓度的增加缓慢提高.采用重掺锌母合金作掺杂剂,可减少锌的损失,较好地控制掺杂浓度.     

水平舟生长GaSb单晶的研制

文中详细地介绍用水平舟生长GaSb单晶的实验过程。简述水平单晶炉的结构及热场分布。用于晶体生长的石英舟经喷沙、Ga炼舟和HF浸泡等措施较好地解决了熔体与石英舟之间的沾润。本实验还特制了一个石英舟,它具有Ga、Sb分开脱氧、合成和去膜之功能,从而实现了Ga、Sb脱氧、合成、去膜和晶体生长在同一石英管内相继进行的新工艺。对GaSb单晶生长的诸多条件进行了详细地分析和讨论。实验结果表明用此法可作到晶锭的90%以上是单晶。掺Te—GaSb单晶的室温载流子浓度为1~3×10~(18)cm~(-3)。其对应的电子迁移率一般是在2500—2700cm~2/V·S的范围。已观察到晶体中位错密度的最小值和最大值分别为70cm~(-2)和1×10~3cm~(-2)。     

用水平布里兹曼法生长GaSb单晶

GaSb是制作光电器件的重要衬底材料。在GaSb上外延生长三元或四元锑化物（如 AlGaSb、InGaAsSb或AlGaAsSb等）,其外延层晶格匹配良好,制成激光器介质损耗小、失散小、功率大,能很好地与氟化物玻璃光纤相匹配,可用于长距离光纤通讯。因此,GaSb是发展新一代光纤通讯与高速电子器件的基础材料。目前,生长GaSb单晶多用双坩埚法、氢气还原法与LEC法等直拉工艺。采用这些工艺易于获得大型锭条,但因GaSb熔点低、过冷度大且极易氧化,不易提高产品质量,产品位错密度通常在10~3～10~4cm~(-2)范围内。为此人们尝试以水平法生长GaSb单晶。     

热压烧结P型碲化铋基热电材料的显微组织与性能

为克服目前市售单晶产品加工性能差、取向性高等问题,以高纯单质Te、Bi和Sb为原料,采用熔炼-冷淬-粉碎-热压工艺制备P型碲化铋基热电材料;用氧氮分析仪、粒度分析仪对热压烧结前粉料的氧含量和粒度进行了测定,用扫描电镜、X射线衍射仪对烧结块体沿不同方向的微观形貌、物相结构进行了表征。不同方向的热电性能测试结果显示,热压工艺制备的P型碲化铋基热电材料在不同方向上的塞贝克系数和ZT值基本相同,但电阻率和热导率有不同程度的取向;与市售区熔单晶相比,取向度明显降低,最终样品的相对密度高达99%,且最高ZT值为1.02。该热压烧结工艺的生产设备简单、生产成本低、工作效率高,适合推广至工业化规模生产。     

水平磁场中GaSb单晶的生长

GaSb 单晶是制备三、四元含锑化合物、Ⅲ-Ⅴ族合金及超晶格等材料的重要衬底材料。用 GaSb 单晶为衬底研制的 GaAs/GaSb 迭层太阳能电池转换效率超过30%,是目前转换效率最高的太阳能电池。在磁场下生长硅和Ⅲ-Ⅴ族化合物半     

碲阳极泥处理工艺的改进

在碱液-电解工艺生产1#精碲时,电解采用不溶性阳极,反应过程中产生氧气,在阳极上出现副产物。贵冶精碲生产中产生的碲阳极泥含碲约40%左右,采用酸浸还原工艺进行回收,碲回收率约为90%。通过实验探索找到了一种处理碲阳极泥的新工艺,在浸出温度95℃、浸出时间3h、液固比5、还原剂用量为3倍碲金属量的条件下加入还原剂A进行浸出,碲阳极泥中有价金属的回收率可由90%左右提高至95%以上。     

住友电气研制出世界上第一个规格最大的GaSb单晶

住友电气已研制成功一种低缺陷大规格的GaSb单晶,并在近期将投放市场。这种单晶(锭形)的直径可达35至50毫米。缺陷在GaSb单晶制备中认为是不可避免的,但住友电气已成功地掌握降低缺陷的技术,使缺陷从通常规定的五分之一降到百分之一到百分之三。这种GaSb的研制成功,意味着对光通讯用的长波长激光器快速红外传感器及超晶格器件等极为     

铜碲渣中碲的回收工艺研究

采用硫酸化焙烧—水浸脱铜—碱浸提碲—电积工艺回收铜碲渣中的碲,考察了NaOH浓度、温度等对碲浸出的影响,并对水解脱杂和碲电积工艺进行探索。结果表明,经过硫酸化焙烧、水浸后,铜脱除率为75%;电积产品碲纯度为99.90%,综合碲回收率约93%;金、银、铂和钯等贵金属进一步富集在碱浸渣中。     

P型GaSb单晶研制

GaSb单晶是制备光电器件的重要衬底材料。GaSb价带自旋轨道的分裂可以得到使空穴离化系数增大的能级,明显改善了波长大于1.3μm的APD的信噪比。其它如AlGaSb APD、GaAlAsSb LED与LD、AlSb/GaSb超晶格、高度电子器件InAs/GaSb超晶格、低阈值HET、FET、HBT等器件也采用GaSb为衬底。此外,GaSb单     

低位错掺铟与不掺杂LEC SI—GaAs单晶生长工艺研究

在微波半导体领域内,2～3英寸高迁移率、高完整性的SI-GaAs单晶是制做GaAs器件特别是GaAs IC的理想材料,但用LEC法生长的单晶位错密度较高,EPD达10~4～10~5cm~(-2)。根据国内外的报道,现有降低LEC GaAs单晶位错工艺的实质是降低单晶的热应力与提高临界切应力。根据这种观点,我们在改进的高压单晶炉中生长了直径     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.