Slack has proposed that the ultimate thermoelectric
material should conduct electricity like a crystal but conduct
heat like a glass.3 To find such a material, he
advocates crystal structures containing weakly bound atoms
or molecules that "rattle" within an atomic cage.
Because good electrical properties must be maintained, it
is likely that there should be at least three distinct
crystallographic sites in the structure—a true ternary
compound. Two of the sites would form the basic framework
of the structure, and this framework would dominate
the band structure and therefore electronic transport. The
third cagelike site would be occupied by the "rattling"
atom that scatters the heat-carrying phonons, thus greatly
reducing the lattice portion of the thermal conductivity.
A class of materials that appears to satisfy many of
the phenomenological requirements for good thermoelectric
materials is the filled skutterudite antimonides. Compounds
with the filled skutterudite structure were discovered7
by Wolfgang Jeitschko and Dieter Braun in 1977
and have the general formula of RM4X12, where X is
phosphorus, arsenic or antimony; M is iron, ruthenium or
osmium; and R is lanthanum, cerium, prasodymium, neodymium
or europium. The antimonide compounds are
cubic, with 34 atoms in the unit cell (figure 3). This
structure can be described as consisting of square planar
rings of four antimony atoms with the rings lying in either
the (100), (010) or (001) crystallographic planes. The
metal, or M, atoms form a simple cubic sublattice, and
the R atoms are positioned in the two remaining "cages"
in the unit cell. X-ray and neutron structure refinements
indicate that for many of the compounds, the R atoms(such as lanthanum or cerium) tend to exhibit exceptionally
large thermal parameters corresponding to the "rattling"
of these atoms in an oversized atomic cage. If the
R atoms are removed from the structure, the basic skutterudite
structure is formed. Because these compounds
are difficult to synthesize in pure form, the solid-state
properties of most of these materials are unknown. Filled
skutterudites investigated by Greg Meisner and his collaborators
at the University of California, San Diego,
however, include several superconductors, a heavy-fermion
metal, Kondo-like narrow-gap semiconductors and a
ferromagnet.8
求英语大神给翻译一下下面关于热电材料的文献,语句一定要通顺啊
一个沉重的fermionmetal,Kondo窄禁带半导体和aferromagnet。★★★以下是谷歌翻译★★★:斯莱克提出,最终的热电材料应该像一个水晶导电,但像玻璃导热。为了找到这样的材料,他主张含弱结合的原子或分子,“咣”原子内笼的晶体结构。因为良好的电性能,必须保持,它很可能是有应在结构的真正三元化合物的...
高分请高手帮忙翻译英文文献资料(4)
As pressure and temperature change, the properties of all materials change. This has to be considered in a prediction of a blowdown process. 随着温度和压力的变化,所有材料的性质也变化。这在预测一个排放过程中必须加以考虑。The main purpose of a blowdown process is as earlier stated ...
求模拟电子基础(模电)有关集成运放放大电路的论文,3,5千字。感激,感激...
这个翻译、写作小学生不行,来个高学历的就可以了,而创造不出名著;这个零件加工不出来,进口加工设备就迎刃而解了,而材料制造水平总是徘徊不前;这个基因条件下研究水平的课题做不下来,引进进口试剂、设备、参考最新国外文献就拿下来