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Crystal structure and magnetic properties of the diuranium tritelluride U2Te3 三碲化二铀U2Te3的晶体结构和磁性能
Pub Date : 1998-01-01 DOI: 10.1016/S0992-4361(98)80015-5
O. Tougait, M. Potel, J.C. Levet, H. Noël

Single crystals of U2Te3 were obtained by solid state reaction between the elements in stoichiometric proportions mixed with a small quantity of cesium chloride. U2Te3 crystallizes in the orthorhombic system, space group Pnma (no 62), with unit cell parameters a = 12.175(2)Å, b = 4.370(1)Å, c = 11.828(2)Å, and Z = 4. The structure was determined from single crystal X-ray diffraction data and refined to final residual factors R(F) = 0.030 and Rω(F) = 0.035 for 32 variable parameters and a unique data set of 1100 diffraction intensities [I > 3σ(I)]. The U atoms are located on two 4c non equivalent crystallographic positions. U(1) has a 7-fold coordination of Te atoms with a coordination polyhedron deriving from an octahedron in which one apex is split into two positions, and U(2) has a monocapped trigonal prismatic coordination. U2Te3 exhibits rather complex magnetic behaviour, with an onset of ferromagnetic order at T ∼ 110 K and spin reorientation below 105 K.

以一定量的氯化铯与这些元素按化学计量比例进行固相反应,制得U2Te3单晶。U2Te3在正交体系中结晶,空间群Pnma (no . 62),晶胞参数a = 12.175(2)Å, b = 4.370(1)Å, c = 11.828(2)Å, Z = 4。根据单晶x射线衍射数据确定结构,并对32个可变参数和1100个衍射强度的唯一数据集进行细化,最终残余因子R(F) = 0.030和Rω(F) = 0.035 [I >3σ(我)]。U原子位于两个4c不等效的晶体位置上。U(1)具有7倍Te原子配位,其配位多面体由一个顶点被分成两个位置的八面体衍生而来,U(2)具有单端三角棱柱配位。U2Te3表现出相当复杂的磁性行为,在T ~ 110 K时铁磁有序开始,在105 K以下自旋重定向。
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引用次数: 11
Li20 evaporation during the laser heated pedestal growth of LiTaO3 single-crystal fibers 激光加热LiTaO3单晶光纤支架生长过程中Li20的蒸发
Pub Date : 1998-01-01 DOI: 10.1016/S0992-4361(98)80010-6
R. Burlot, M. Ferriol, R. Moncorgé, G. Boulon

The growth of LiTaO3 single-crystal fibers by the Laser Heated Pedestal Growth technique was performed using different pulling rates and growth atmosphere pressures. Fibers were produced with a diameter of about 800 μm and lengths between 20 and 50 mm. Due to the high melting point of LiTaO3, incongruent evaporation of lithium oxide took place during the growth. Its influence on the morphology of the crystals obtained was characterized by transmission optical microscopy and an estimate of the evaporation time constant of Li2O made.

采用激光加热支架生长技术在不同的拉伸速率和生长气压下生长LiTaO3单晶光纤。纤维的直径约为800 μm,长度在20至50毫米之间。由于LiTaO3的熔点较高,在生长过程中会发生氧化锂的不均匀蒸发。通过透射光学显微镜表征了其对所得晶体形貌的影响,并估算了Li2O的蒸发时间常数。
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引用次数: 6
Electrical Transport Properties of the Misfit Layer Compounds (SnS)1. 20TiS2 and (PbS)1.18TiS2 Misfit层化合物(SnS)的电输运性质20TiS2和(PbS)1.18TiS2
Pub Date : 1991-11-12 DOI: 10.1002/CHIN.199145021
G. Wiegers, R. Haange
(SnS)1.20TiS2 and (PbS)1.18TiS2 are misfit layer compounds, built of alternate double layers SnS (PbS), actually a slightly distorted {001} slice of rocksalt type SnS (PbS), and sandwiches TiS2, slightly distorted compared to those of 1T-TiS2. The electrical transport properties, measured on single crystals for the in-plane resistivity (rho-ab), the resistivity along c (rho-c) and Hall coefficient (R(H)) and on powder compacts for the Seebeck coefficient (alpha) are metallic like those of 1T-TiS2 intercalated with an electron donating species. The rho-ab versus temperature curves are non-linear from 4 to 300 K. R(H) and alpha are negative for both compounds. The Hall coefficients at 300 K correspond with 0.20 +/- 0.04 e/Ti for (SnS)1.20TiS2 and 0.43 +/- 0.09 e/Ti for (PbS)1.18TiS2. The Seebeck coefficients point to 0.2 - 0.4 e/Ti.
(SnS)1.20TiS2和(PbS)1.18TiS2是错配层化合物,由交替的双层SnS (PbS)组成,实际上是岩盐型SnS (PbS)的{001}片轻微扭曲,夹在TiS2中,与1T-TiS2相比略有扭曲。在单晶的平面内电阻率(rho-ab)、沿c的电阻率(rho-c)和霍尔系数(R(H))以及粉末压块的塞贝克系数(alpha)上测量的电输运性质,与1T-TiS2嵌入电子给体的金属性质相似。rho-ab随温度变化曲线在4 ~ 300 K范围内呈非线性。R(H)和都是负的。300 K时,(SnS)1.20TiS2的霍尔系数为0.20 +/- 0.04 e/Ti, (PbS)1.18TiS2的霍尔系数为0.43 +/- 0.09 e/Ti。塞贝克系数指向0.2 - 0.4 e/Ti。
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引用次数: 23
Barium titanate by the sol-gel process 溶胶-凝胶法制备钛酸钡
Pub Date : 1989-12-12 DOI: 10.1002/CHIN.198950336
A. Larbot, F. García, C. Guizard
The Sol-Gel technique is used to prepare powder and densified ceramic of BaTiO 3 . The experimental conditions (precursors, hydrolysis, heat treatment) for the preparation of a powder, suitable for sintering onto a product of high dielectric constant and weak loss tangent, are studied. The characteristics of the ceramic as a fonction of the sintering temperature are also reported
采用溶胶-凝胶法制备了batio3粉体和致密化陶瓷。研究了制备适合于高介电常数、弱损耗正切材料的粉末的实验条件(前驱体、水解、热处理)。本文还报道了烧结温度对陶瓷性能的影响
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引用次数: 6
On trigonal weberites: structure refinements of Na2MnC1F7 and Na2MnGaF7 三角网:Na2MnC1F7和na2mnngaf7的结构改进
Pub Date : 1989-04-04 DOI: 10.1002/CHIN.198914008
G. Courbion, G. Férey, H. Holler, D. Babel
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引用次数: 12
Na2SiF6 and ordered trirutile-types: crystal and magnetic structure of α- and β-LiMnVF6 Na2SiF6和有序三元型:α-和β-LiMnVF6的晶体和磁性结构
Pub Date : 1989-03-28 DOI: 10.1002/CHIN.198913004
G. Courbion, C. Jacoboni, P. Wolfers
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引用次数: 5
Synthesis and study of sodium hydroxi-cuprate: Na2Cu (OH)4 and copper hydroxide: Cu(OH)2 氢氧化铜钠:Na2Cu (OH)4和氢氧化铜:Cu(OH)2的合成与研究
Pub Date : 1989-03-28 DOI: 10.1002/CHIN.198913003
Y. Cudennec, A. Lecerf, A. Riou, Y. Gérault
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引用次数: 7
New lanthanide hydrogen phosphites LnH(PO3H)2 2H2O 新型镧系亚磷酸氢盐LnH(PO3H) 2H2O
Pub Date : 1989-03-21 DOI: 10.1002/CHIN.198912008
J. Durand, M. Loukili, N. Tijani, M. Rafiq, L. Cot
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引用次数: 3
The layered compounds AMv(PO4)2 (A=K, Rb, Cs and M=Sb, Nb, Ta) 层状化合物AMv(PO4)2 (A=K, Rb, Cs, M=Sb, Nb, Ta)
Pub Date : 1989-03-21 DOI: 10.1002/CHIN.198912005
S. Oyetola, A. Verbaere, Y. Piffard, M. Tournoux
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引用次数: 24
NMR Study of the intermetallic phase Li2Ga7 金属间相Li2Ga7的核磁共振研究
Pub Date : 1989-03-21 DOI: 10.1002/CHIN.198912018
M. Tillard-Charbonnel, C. Belin, M. Herzog-Cance
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引用次数: 3
期刊
European Journal of Solid State and Inorganic Chemistry
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