Journal of The Less Common Metals最新文献

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M10S14O-type oxysulphides (M La, Ce, Pr, Nd, Sm) as an “oxygen trap” in oxidation reactions of reduced lanthanide chlorides with sulphur m10s14o型氧硫化物(M、La、Ce、Pr、Nd、Sm)在还原性镧系氯化物与硫氧化反应中的“氧阱”作用

Journal of The Less Common Metals

Pub Date : 1991-10-01 DOI: 10.1016/0022-5088(91)90017-X

T. Schleid, F. Lissner

引用次数: 55

Study of SiC-whisker-reinforced ZrO2 ceramics using the sol-gel method 溶胶-凝胶法制备sic晶须增强ZrO2陶瓷

Journal of The Less Common Metals

Pub Date : 1991-10-01 DOI: 10.1016/0022-5088(91)90005-O

G. Tu, Z. Sui, Changzhen Wang

引用次数: 4

Kinetic study of the hafnium-hydrogen reaction 铪-氢反应动力学研究

Journal of The Less Common Metals

Pub Date : 1991-10-01 DOI: 10.1016/0022-5088(91)90007-Q

Y Levitin, J Bloch, M.H Mintz

The kinetics of hafnium hydride formation were studied utilizing conventional rate measurements (Sieverts system) combined with metallographic examinations of partially hydrided samples. The rate measurements were performed at 700 TorrH₂ over a temperature range 200–550 °C. Two types of hafnium samples (polycrystalline and crystal bar) were compared. The progression of the massive stage of the reaction is characterized by a contracting-envelope morphology with a constant hydride front velocity. The anisotropy in the reaction front velocity regarding different crystalline orientations of the metal is small, resulting in similar results for the different types of hafnium. The temperature dependence of the front velocity obeys an Arrhenius-type relation over the temperature range 250–450 °C, with an apparent activation energy of 0.50 ± 0.05 eV. Considering a diffusion-controlled model, a diffusion activation barrier of about 0.4 eV is evaluated, which agrees with the average reported value for the diffusion of hydrogen in hafnium hydride. At temperatures above about 500 °C, deviations from the Arrhenius relation are displayed, possibly owing to a change of mechanism.

利用常规速率测量（Sieverts系统）结合部分氢化样品的金相检查，研究了氢化铪的形成动力学。速率测量是在700 TorrH2下在200–550°C的温度范围内进行的。比较了两种类型的铪样品（多晶和晶棒）。反应大质量阶段的进展以收缩包络形态为特征，氢化物前沿速度恒定。关于金属的不同结晶取向，反应前沿速度的各向异性很小，导致不同类型铪的类似结果。在250–450°C的温度范围内，前沿速度的温度依赖性服从Arrhenius型关系，表观活化能为0.50±0.05 eV。考虑到扩散控制模型，评估了约0.4 eV的扩散活化势垒，这与氢在氢化铪中扩散的平均报告值一致。在大约500°C以上的温度下，显示出与阿伦尼斯关系的偏差，这可能是由于机制的变化。

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引用次数: 9

Ferromagnetic materials: A handbook on the properties of magnetically ordered substances, vol. 5 铁磁材料:磁性有序物质性质手册，第5卷

Journal of The Less Common Metals

Pub Date : 1991-10-01 DOI: 10.1016/0022-5088(91)90024-X

Ch.J. Raub

引用次数: 8

SrHgO2: Ein oxomercurat mit delafossitstruktur 弓状x光片

Journal of The Less Common Metals

Pub Date : 1991-10-01 DOI: 10.1016/0022-5088(91)90015-V

M Soll, Hk Müller-Buschbaum

For the first time, single crystals of SrHgO₂ have been prepared by a high pressure oxidation technique. X-ray investigations indicate that the crystals have trigonal symmetry, space group D₃⁶-P3₂21 (no. 154), with $a = 3.833(3) a ̊ A$ , $c = 18.990(15) A ̊$ and Z = 3. Hg²⁺ has a coordination number of two, while Sr²⁺ is surrounded by six oxygen ions. Two-dimensional layers of edge-linked SrO₆ octahedra are connected by O-Hg-O dumb-bells. SrHgO₂ belongs to the delafossite-type structure.

首次采用高压氧化技术制备了SrHgO2单晶。X射线研究表明，该晶体具有三角对称性，空间群D36-P3221（编号154），a=3.833（3）a，c=18.990（15）a，Z=3。Hg2+的配位数为2，而Sr2+被六个氧离子包围。边缘连接的SrO6八面体的二维层由O-Hg-O哑铃连接。SrHgO2属于拉佛斯岩型结构。

引用次数: 13

Thermodynamic studies of La(FexAl1−x)13 alloys La(FexAl1−x)13合金的热力学研究

Journal of The Less Common Metals

Pub Date : 1991-10-01 DOI: 10.1016/0022-5088(91)90012-S

Xiuguang Xu, Guangqiang Li, Hualong Yu, Changzhen Wang

引用次数: 5

On magnetic transitions in a novel compound, UPdGa 新型化合物UPdGa的磁跃迁

Journal of The Less Common Metals

Pub Date : 1991-10-01 DOI: 10.1016/0022-5088(91)90011-R

V. Tran, R. Troć

引用次数: 8

Synthesis and crystal structure of MTe2O6 (M≡Ce, Th) MTe2O6 (M≡Ce, Th)的合成与晶体结构

Journal of The Less Common Metals

Pub Date : 1991-10-01 DOI: 10.1016/0022-5088(91)90008-R

M. López, M. Veiga, A. Jerez, C. Pico

引用次数: 11

Influence of quenching rate and heat treatment on the magnetic properties and phase components of rapidly quenched Fe77.5Nd4B18.5 alloy 淬火速率和热处理对快速淬火Fe77.5Nd4B18.5合金磁性能和相成分的影响

Journal of The Less Common Metals

Pub Date : 1991-10-01 DOI: 10.1016/0022-5088(91)90004-N

Shen Bao-gen, Yang Lin-yuan, Zhang Jun-xian, Zhao Jian-gao

The magnetic properties and phase components of rapidly quenched Fe_77.5Nd₄B_18.5 alloy as a function of quenching rate and heat treatment were studied. X-ray diffraction and thermomagnetic measurements show that the Fe_77.5Nd₄B_18.5 ingot consists of Nd₂Fe₁₄B, Fe₂B and α-Fe. The X-ray diffraction patterns of optimally annealed samples show only metastable Fe₃B phase which decomposes into Fe₂B and α-Fe at T_a > 850 °C, but the thermomagnetic curves show the presence of the Nd₂Fe₁₄B phase. In the sample annealed at 950 °C for 60 min, Nd_1.1Fe₄B₄ appears in coexistence with Nd₂Fe₁₄B, Fe₂B and α-Fe. The Fe_77.5Nd₄B_18.5 alloy is found to have very good glass-forming ability. Samples prepared at quenching rates v_s ⩾ 6.6 m s⁻¹ are amorphous and magnetically soft. Annealing at about 650–670 °C gives the highest coercive field, which is nearly independent of quenching rate.

研究了快速淬火Fe77.5Nd4B18.5合金的磁性能和相组成随淬火速度和热处理的变化。X射线衍射和热磁测量表明，Fe77.5Nd4B18.5铸锭由Nd2Fe14B、Fe2B和α-Fe组成。最佳退火样品的X射线衍射图仅显示亚稳的Fe3B相，其在Ta>；850°C，但热磁曲线显示Nd2Fe14B相的存在。在950°C退火60min的样品中，Nd1.1Fe4B4与Nd2Fe14B、Fe2B和α-Fe共存。发现Fe77.5Nd4B18.5合金具有很好的玻璃形成能力。在淬火速率vs⩾6.6 m s−1下制备的样品是无定形的且磁软的。在约650–670°C下退火可产生最高的矫顽场，这几乎与淬火速率无关。

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引用次数: 4

Synthesis, structure and properties of a new intermetallic compound, Ca7Ni4Sn13 新型金属间化合物Ca7Ni4Sn13的合成、结构与性质

Journal of The Less Common Metals

Pub Date : 1991-10-01 DOI: 10.1016/0022-5088(91)90020-5

Deborah A Vennos, Michael E Badding, F.J DiSalvo

Crystals of a new intermetallic compound, Ca₇Ni₄Sn₁₃, have been prepared. The refined structure was solved in the P4/m space group, Z = 1 with lattice constants $a = 11.200(1) A ̊$ and $c = 4.594(1) A ̊$ , R = 2.8% and R_w = 2.4%. This new structure type consists of an Sn-Ni network forming channels parallel to the c axis which are filled with calcium atoms. Temperature-dependent magnetic and conductivity studies show Ca₇Ni₄Sn₁₃ to be Pauli paramagnetic with simple metallic behavior.

制备了一种新型金属间化合物Ca7Ni4Sn13的晶体。精细结构在P4/m空间群中求解，Z=1，晶格常数a=11200A和c=4.594（1）a，R=2.8%和Rw=2.4%。这种新的结构类型由Sn-Ni网络组成，该网络形成平行于c轴的通道，通道中填充有钙原子。温度相关的磁性和导电性研究表明，Ca7Ni4Sn13是泡利顺磁性的，具有简单的金属行为。

引用次数: 6

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