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wenzhe8228

金虫 (正式写手)


[交流] 零膨胀性能材料领域最新研究进展——《Advanced Materials》

《Advanced Materials》杂志9月12日在线刊登北京工业大学宋晓艳教授研究组(研究组网址:http://cms.bjut.edu.cn)在零膨胀材料研究领域最新进展。

极极少数的纳米领域零膨胀材料研究报道,请珍惜收藏。

相关中文内容简述报道请参见科学网最新报道:
http://paper.sciencenet.cn/htmlpaper/201191415434634719377.shtm
正文可同时下载

Materialsview报道内容:
A Material for All Weathers (with Zero Thermal Expansion)
by Carol Stanier published: 2011-09-26


Specialized materials that do not change their volume with alteration of temperature may now be easier to produce, thanks to work by a multinational team of scientists into the mechanism of such behavior in antiperovskite manganese nitrides.

Every child learns in school that materials expand or contract with changes in temperature. There are only a few special materials that barely or do not alter their volume in response to temperature, and this normally only occurs over a relatively narrow temperature window. This property is called zero thermal expansion. But such materials are in great demand for both precision engineering of sensitive bulk systems and as components for nanodevices. For example, the gyroscopes used in spacecraft must maintain the same functionality independent of the temperature at which they operate.

The most common way to control thermal expansion is by combining materials with different thermal expansion behavior, however, this method leads to local stresses and strains that often enhance material fatigue and thus shorten component lifetime. Zero thermal expansion in a single, uncombined material is only known in a few cases, one of which is a class of materials called antiperovskite manganese nitrides.

Now, Xiaoyan Song at Beijing University of Technology, China, and co-workers from as far afield as NIST in Gaithersburg, USA, University of Jena in Germany, the Chinese Academy of Sciences, and the National Institute for Materials Science in Tsukuba, Japan, have worked together on these antiperovskite manganese nitrides to discover how the effect occurs and thus to extend it beyond the normal temperature ranges for these materials.

The scientists found that the thermal expansion behavior of the antiperovskite manganese nitrides can be controlled by altering the lattice site occupancy of the manganese within the solid-state structure, i.e., each compound has a fixed number of available sites that can be occupied by manganese and some of these sites may be left unoccupied while the whole structure is still retained. Such alteration affects the magnetic ordering in the material which in turn influences the behavior of the material with respect to temperature.

The scientists achieved a much larger than usual range of temperatures over which zero thermal expansion occurs in antiperovskite manganese nitrides; three to four times greater than previously reported.

Professor Song believes that their mechanism for altering the zero thermal expansion behavior is a universal one that could be applied to other types of material also. This result should enable materials scientists to provide engineers and nanoscientists with new and varied building blocks for the most critical of applications.

[ Last edited by wenzhe8228 on 2011-9-30 at 15:27 ]
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ninghai

金虫 (小有名气)


材料学院新型功能材料研究获得重要进展
发布时间:2011年09月15日 17:11  | 发布部门:材料学院  | 阅读人数:42
最近,材料学院新型功能材料教育部重点实验室宋晓艳教授负责的课题组,在纳米结构新型功能材料研究方面获得重要进展。

该课题组在国际上首次制备出了平均晶粒尺寸减小到约十个纳米的超细纳米晶反钙钛矿结构锰氮化合物块体。该化合物体系是目前最具潜力的具有零膨胀性能的材料之一。与美国国家标准与技术研究所黄清镇研究员等合作,通过中子衍射分析,发现超细纳米晶反钙钛矿结构锰氮化合物块体在12~230K的超宽温度范围内展现出令人惊喜的零膨胀性能,其热膨胀系数的绝对值仅为|α|= 1.18×10-7K-1。实验结果证实,材料纳米化是降低某些晶格阵点占位率的一条创新和有效的途径。研究指出,凡是能改变磁结构中原子占位率的方法,均可能通过调整磁有序化过程而控制材料负热膨胀和正热膨胀之间的平衡关系,从而实现对单一化合物材料热膨胀行为乃至零热膨胀性能的精确操控。该机理原则上适于任何具有磁弹性(磁致伸缩特性)的材料体系,可根据实际需要设计开发适应于不同领域的新型零膨胀材料。这为先进功能材料的研发提供了重要的学术思路和技术途径。

该研究结果以不做任何修改的方式优先发表(“publish online with maximum priority”)在近期的《先进材料》(Advanced Materials 2011, doi: 10.1002/adma.201102552)上。同时,该项工作以题为“Zero Thermal Expansion is Controllable in Magneto-elastic Materials (磁弹性材料中的零膨胀实现可控)”在国际材料权威媒体MaterialsViews作了专题报道。

近年来,在学院的大力支持下,宋晓艳教授负责的课题组在纳米结构新型功能材料的制备技术方面,已获得授权发明专利15项;在纳米材料的热稳定性与相稳定性的基础研究方面,在Adanced Materials (影响因子IF 10.86), ACS Nano (IF 9.86), Nanoscale (IF 4.12), Applied Physics Letters (IF 3.82), Acta Materialia (IF 3.78)等国际知名刊物上发表影响因子3.0以上的论文15篇。

这次是宋晓艳教授在Advanced Materials上发表的第二篇学术论文,也是我校在纳米结构新型功能材料方面取得的又一重要研究成果。在此,我们表示热烈祝贺。


                                        材料学院
11楼2011-09-15 19:57:01
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gary286

木虫 (正式写手)



wenzhe8228(金币+1):谢谢参与
多谢分享!!!
9楼2011-09-15 19:28:52
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ninghai

金虫 (小有名气)



wenzhe8228(金币+1):谢谢参与
这个研究组好像发了很多高水平论文啊

宋晓艳教授负责的课题组在纳米结构新型功能材料的制备技术方面,已获得授权发明专利15项;在纳米材料的热稳定性与相稳定性的基础研究方面,在Adanced Materials (影响因子IF 10.86), ACS Nano (IF 9.86), Nanoscale (IF 4.12), Applied Physics Letters (IF 3.82), Acta Materialia (IF 3.78)等国际知名刊物上发表影响因子3.0以上的论文15篇。

这次是宋晓艳教授在Advanced Materials上发表的第二篇学术论文,也是我校在纳米结构新型功能材料方面取得的又一重要研究成果。
10楼2011-09-15 19:55:14
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