Journal of The Less Common Metals最新文献

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The isothermal section (500 °C) of the phase diagram of the ternary system Cu-Sn-Y Cu-Sn-Y三元体系相图的等温截面(500℃)

Journal of The Less Common Metals

Pub Date : 1991-09-20 DOI: 10.1016/0022-5088(91)90353-6

Zhuang Yinghong, Qin Can, Li Junqin

The isothermal section (500 °C) of the phase diagram of the ternary system Cu-Sn-Y (40 at.% Y or less) was investigated by X-ray diffraction, differential thermal microanalysis, optical microanalysis and electron probe microanalysis techniques. The isothermal section consists of 12 single-phase regions, 25 two-phase regions and 14 three-phase regions. Three new ternary compounds were found in this isothermal section: the θ phase (Y₈Cu₇Sn₅), the β phase (Y₃Cu₄Sn₃) and the γ phase (Y₁₉Cu₆₆Sn₁₅). They are all non-variable compounds. The θ phase is an orthorhombic system with $a = 9.702 A ̊$ , $b = 7.285 A ̊$ and $c = 6.545 A ̊$ .

The maximum solid solubility of tin in α-Cu at 500 °C is about 9.0 at.% and that of yttrium in α-Cu at 500 °C (with 4.3 at.% Sn) is about 1.5 at.%.

用X射线衍射、差热显微分析、光学显微分析和电子探针显微分析技术研究了Cu-Sn-Y（40at.%Y或更低）三元系相图的等温截面（500°C）。等温截面由12个单相区域、25个两相区域和14个三相区域组成。在该等温截面上发现了三种新的三元化合物：θ相（Y8Cu7Sn5）、β相（Y3Cu4Sn3）和γ相（Y19Cu66Sn15）。它们都是不可变的化合物。θ相是一个正交体系，a=9.702A，b=7.285A，c=6.545A。锡在α-Cu中的最大固溶性在500°c时约为9.0at.%，钇在α-Cu500°c（含4.3at.%Sn）时约为1.5at.%。

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引用次数: 0

Ion beam deposition of silver on YBCO powder and the superconductivity of Ag-YBCO composites 银在YBCO粉末上的离子束沉积及Ag-YBCO复合材料的超导性

Journal of The Less Common Metals

Pub Date : 1991-09-20 DOI: 10.1016/0022-5088(91)90363-9

H.R. Khan , H. Frey

YBa₂Cu₃O_∼7 (YBCO) powder of particle size distribution smaller than 80 μm has been coated with silver by a secondary ion beam deposition technique. Sintered Ag-YBCO composites prepared from this powder consist of homogeneously distributed orthorhombic phase, Ag₂O, silver and a small amount of other phases. The composites are superconducting at about 92 K, with a sharp superconducting transition.

采用二次离子束沉积技术对粒径分布小于80μm的YBa2Cu3O～7（YBCO）粉末进行了镀银。由该粉末制备的烧结Ag-YBCO复合材料由均匀分布的正交相、Ag2O、银和少量其他相组成。该复合材料在大约92K下是超导的，具有尖锐的超导转变。

引用次数: 2

Crystal structure of the compound CeRh1 − xGe2 + x (x = 0.325) 化合物CeRh1−xGe2 + x (x = 0.325)的晶体结构

Journal of The Less Common Metals

Pub Date : 1991-09-20 DOI: 10.1016/0022-5088(91)90343-3

B.I. Shapiev, O.L. Sologub, Ju.D. Seropegin, O.I. Bodak, P.S. Salamakha

引用次数: 7

The structure of LiCu2O2 with mixed-valence copper from twin-crystal data 从双晶数据研究含混价铜的LiCu2O2的结构

Journal of The Less Common Metals

Pub Date : 1991-09-20 DOI: 10.1016/0022-5088(91)90356-9

Rolf Berger , Auke Meetsma, Sander van Smaalen, Margareta Sundberg

The structure of LiCu₂O₂ was solved using two sets of X-ray diffraction twin-crystal data. Extended twinning creates virtual tetragonal symmetry. The compound crystallizes in Pnma (62) with unit-cell parameters $a = 5.72 A ̊, b = 2.86 A ̊$ and $c = 12.4 A ̊$ with a certain homogeneity range. The structure consists of LiCu^IIO₂ layers interleaved by layers of Cu^I connected to oxygen in an almost linear coordination. Lithium and copper(II) have five oxygen neighbours in pyramidal arrangements that run as parallel bands through edge connections. Electron diffraction was used for characterizing the twinning.

利用两组X射线衍射双晶数据求解了LiCu2O2的结构。扩展的孪晶形成了虚拟的四方对称。该化合物在Pnma（62）中结晶，晶胞参数a=5.72A，b=2.86A，c=12.4A，具有一定的均匀性范围。该结构由以几乎线性配位连接到氧的CuI层交织的LiCuIIO2层组成。锂和铜（II）有五个相邻的氧，呈金字塔状排列，通过边缘连接作为平行带运行。电子衍射用于表征孪晶。

引用次数: 29

Constitutional studies of molybdenum-palladium alloys using ultra-rapidly solidified samples 用超快速凝固试样研究钼钯合金的组成

Journal of The Less Common Metals

Pub Date : 1991-09-20 DOI: 10.1016/0022-5088(91)90350-D

R. Gürler, J. N. Pratt

引用次数: 10

Mössbauer and magnetic properties study of Nd2Fe14C-type compounds Mössbauer及nd2fe14c型化合物的磁性能研究

Journal of The Less Common Metals

Pub Date : 1991-09-20 DOI: 10.1016/0022-5088(91)90352-5

F. Xing, W.W. Ho, C.L. Yang, F.S. Li

The dependence of the Curie temperature T_c and saturation magnetization σ_s on composition was studied in the alloys Nd₁₄Fe_{78 − x}T_xC₈ (T ≡ Co, Ni, Mn, Cr). The effects on T_c and σ_s of the substitution of these 3d elements for iron were found to be similar to the effects on T_c and σ_s of the corresponding borides. Mössbauer spectra of the tetragonal Nd₂Fe₁₄C compound were taken at various temperatures and fitted with a set of six subspectra owing to six non-equivalent iron sites. It was found that the average hyperfine fields at 295 K and 4.2 K are 28.04 T and 32.36 T, the corresponding average iron moments being about 1.89 μ_B and 2.19 μ_B, respectively.

研究了Nd14Fe78−xTxC8（T≠Co，Ni，Mn，Cr）合金的居里温度Tc和饱和磁化强度σs与成分的关系。发现用这些3d元素代替铁对Tc和σs的影响与相应硼化物对Tc、σs的作用相似。在不同温度下获得了四方Nd2Fe14C化合物的穆斯堡尔谱，并由于六个非等效铁位而拟合了一组六个子谱。研究发现，295K和4.2K的平均超精细场分别为28.04T和32.36T，相应的平均磁矩分别约为1.89μB和2.19μB。

引用次数: 6

Über die Möglichkeit einer Mischungslücke in dem Na-Ga binären System 亚联二进制系统中可能出现的缺口

Journal of The Less Common Metals

Pub Date : 1991-09-20 DOI: 10.1016/0022-5088(91)90344-4

P. Feschotte

引用次数: 3

The effect of cold deformation on the structure, texture and properties of yttrium high temperature superconducting powders and strips 冷变形对钇高温超导粉末和带的组织、织构和性能的影响

Journal of The Less Common Metals

Pub Date : 1991-09-20 DOI: 10.1016/0022-5088(91)90347-7

V. Shamraǐ, A. Pimenov, Y. Efimov, A. A. Babaréko, F. R. Karelin, V. F. Choporov, T. Frolova, E. Myasnikova, A. Postnikov

引用次数: 0

Magnetic structures of TbMn6Sn6 and HoMn6Sn6 compounds from neutron diffraction study 中子衍射研究TbMn6Sn6和HoMn6Sn6化合物的磁性结构

Journal of The Less Common Metals

Pub Date : 1991-09-20 DOI: 10.1016/0022-5088(91)90359-C

B.Chafik El Idrissi, G. Venturini, B. Malaman, D. Fruchart

引用次数: 71

The crystal structure of the low temperature form of Co2As 低温态Co2As的晶体结构

Journal of The Less Common Metals

Pub Date : 1991-09-20 DOI: 10.1016/0022-5088(91)90361-7

Ingrid Lindeberg, Y. Andersson

引用次数: 8

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