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排序方式: 共有143条查询结果,搜索用时 187 毫秒
31.
32.
33.
34.
A comprehensive review of structure work on high-T
c
oxides as reported during the years 1987 and 1988 is given. Thirteen structures are refined from X-ray single-crystal and/or neutron powder diffraction data:I. (Ba1–x
,K
x
)BiO3 (T
c
=30 K),II. (La2–x
, Sr
x
)CuO4 (T
c
=40 K),III. (Nd, Ce, Sr)2CuO4 (T
c
=28 K),IV. (Nd2–x
, Ce
x
)CuO4 (T
c
=24 K),V. YBa2Cu3O7 (T
c
=90 K),VI. YBa2Cu4O8 (T
c
=80 K),VII. Y2Ba4Cu7O14 (T
c
=40 K),VIII. Pb2Sr2NdCu3O8 (T
c
=70 K),IX. TlBa2CaCu2O7 (T
c
=103 K),X. TlBa2Ca2Cu3O9 (T
c
=120 K),XI. Tl2Ba2CuO6 (T
c
=90 K),XII. Tl2Ba2CaCu2O8 (T
c
=112 K),XIII. Tl2Ba2Ca2Cu3O10 (T
c
=125 K). Except forI (perovskite type),II (K2NiF4 type) andIV (Nd2CuO4 type) they represent new structure types. Structure data, bond distances, structure drawings and calculated X-ray powder diffraction patterns are given for each compound. Structural features and correlations with superconductivity are discussed. The review contains 301 citations. 相似文献
35.
Fr. Müller J. Yvon V. della Cella A. Schneider und G. Vulpius 《Fresenius' Journal of Analytical Chemistry》1888,27(1):122
Ohne Zusammenfassung 相似文献
36.
E. Jacquemin Latour Yvon Wurtz Marty R. Brunner S. Cotton C. Weigelt A. Gautier V. Griessmayer Skalweit K. Portele und E. Mach 《Fresenius' Journal of Analytical Chemistry》1880,19(1):225-229
Ohne Zusammenfassung 相似文献
37.
Ohne ZusammenfassungMit 1 Abbildung 相似文献
38.
Summary.
In this paper we analyze and illustrate a new "ab initio"
part design
procedure, in which, given a cost function which reflects
performance,
materials, and manufacturing considerations, the topology and the
geometry
of the part are automatically produced. The analysis is based on
demonstration
of, first, the compactness of the metric space over which the cost
function is
defined, and, second, lower semi-continuity of the cost function.
Examples include beams and
elastic supports.
Received November 15, 1993 相似文献
39.
Yvon Pointud Jean Juillard Lèvon Avedikian Jean-Pierre Morel Michel Ducros 《Thermochimica Acta》1974,8(4):423-431
By using a calorimetric method, solution enthalpies of sodium, potassium, rubidium and cesium chlorides in mixtures containing from 0 to 45% by weight of alcohol are obtained. Standard enthalpies and transfer enthalpies are estimated. From previous data concerning Gibbs energies of transfer from water to the same solvent mixtures, transfer entropies are calculated. Enthalpies and entropies exhibit a maximum for molar fractions of about 0.07 of organic solvent. Results are discussed in terms of enhancement of the structuration of the aqueous network. 相似文献
40.
H. Kohlmann G. Renaudin K. Yvon B. Harbrecht 《Journal of solid state chemistry》2005,178(4):1292-1300
The hydrogenation behavior of MgPd3 has been studied by in situ X-ray powder diffraction and by neutron powder diffraction. At room temperature and p ≈500 kPa hydrogen pressure its structure is capable of incorporating up to one hydrogen atom per formula unit (α-MgPd3H≈1), thereby retaining a tetragonal ZrAl3-type metal atom arrangement. Upon heating to 750 K in a hydrogen atmosphere of 610 kPa it transforms into a cubic modification with AuCu3-type metal atom arrangement (β-MgPd3H≈0.7). Neutron diffraction on the deuteride reveals an anion deficient anti-perovskite-type structure (β-MgPd3D0.67, a=398.200(7) pm) in which octahedral sites surrounded exclusively by palladium atoms are occupied by deuterium. Complete removal of hydrogen (480 K, 1 Pa) stabilizes a new binary modification (β-MgPd3, a=391.78(2) pm) crystallizing with a primitive cubic AuCu3-type structure. Mechanical treatment (grinding) transforms both α and β modifications of MgPd3 into a cubic face-centered solid solution Mg0.25Pd0.75 showing a random distribution of magnesium and palladium atoms. 相似文献