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排序方式: 共有104条查询结果,搜索用时 15 毫秒
31.
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E.H. Bocanegra M.J. Tello M.A. Arriandiaga H. Arend 《Solid State Communications》1975,17(10):1221-1222
A second order phase transition between the space groups D182h and D174hleads to the high temperature tetragonal phase of (CH3NH3)2MnCl4. Similar transitions to tetragonal phases exist also in the ethyl- and propyl-compounds. Transition temperature increase with an increasing carbon chain length. Very low ΔH- and ΔS-values are compatible with a transition model obtained from nuclear resonance experiments. Further thermoanalytical results bear evidence on the complex role of alkyl-ammonium groups. 相似文献
33.
The structure of (CH3)3NHCdCl3 has been determined by single crystal X-ray diffraction at 174K. Phase changes around 342, 374, and 415 K have been detected by DTA and have been correlated with the dynamics of the organic groups via NMR measurements. No change of Laue symmetry has been observed between 170 and 400 K. 相似文献
34.
A thickness dependence of the permittivity ofc-domain barium titanate single crystals was found. The experimental results were explained by means of a model of a dielectric with surface layers. The thickness of the layer and the permittivity of the surface layer and bulk of the crystal were determined.
iO3
iO3, -. . , .相似文献
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Hamans BC Andreychenko A Heerschap A Wijmenga SS Tessari M 《Journal of magnetic resonance (San Diego, Calif. : 1997)》2011,212(1):224-228
A method to achieve NMR of dilute samples in the earth's magnetic field by applying para-hydrogen induced polarization is presented. Maximum achievable polarization enhancements were calculated by numerically simulating the experiment and compared to the experimental results and to the thermal equilibrium in the earth's magnetic field. Simultaneous 19F and 1H NMR detection on a sub-milliliter sample of a fluorinated alkyne at millimolar concentration (~10(18) nuclear spins) was realized with just one single scan. A highly resolved spectrum with a signal/noise ratio higher than 50:1 was obtained without using an auxiliary magnet or any form of radio frequency shielding. 相似文献
37.
E. Colla P. Muralt H. Arend R. Perret G. Godefroy C. Dumas 《Solid State Communications》1984,52(12):1033-1036
The [(CH3)4N]2ZnCl4?xBrx system shows a complete miscibility with a common Pnma high temperature phase. The (x,T)-phase diagram (x given by [(CH3)4N]2ZnCl4?xBrx) was determined by means of DSC- and X-ray measurements. In the vicinity of both end members an analogy to the (P,T)-phase diagrams of pure compounds is observed with an increasing x corresponding to an increase of pressure. In the intermediate part of the system other effects become important leading to large coexistence regions of different phases. This is evidently due to the simultaneous occupancy of anion tetrahedra by different numbers of Cl and Br atoms. The non-equivalent ZnX4-tetrahedra of solid solutions do not suppress the occurence of the incommensurate phases. They exist between x = 0 to ?3 and are interrupted by a supposedly ferroelectric phase occuring up to x ?0.4. Around x ? 3 a triple point occurs the nature of which needs a closer elucidation. 相似文献
38.
Magnetic and mechanical AC loss of the ITER CS1 model coil conductor under transverse cyclic loading
Arend Nijhuis Niels H. W. Noordman Herman H. J. ten Kate Neil Mitchell Pierluigi Bruzzone 《Physica C: Superconductivity and its Applications》1998,310(1-4):253-257
The magnetic field in a coil results in a transverse force on the strands pushing the cable towards one side of the jacket. A special cryogenic press has been built to study in a unique way the mechanical and electrical properties of full-size ITER Cable-in-Conduit (CIC) samples under a transverse, mechanical load. The press can transmit a variable (cyclic) force of at least 650 kN/m to a cable section of 400 mm at 4.2 K. The jacket around the cable is partly opened in order to transmit the transverse force directly onto the cable. A superconducting dipole coil provides the AC magnetic field required to perform magnetisation measurements with pick-up coils. In addition the interstrand resistance (Rc) between various strands selected from topologically different positions inside the cable is measured. The force on the cable as well as the displacement are monitored simultaneously in order to determine the effective cable Young's modulus and the mechanical heat generation due to friction and deformation as the force is cycled. The mechanical heat generation, the coupling loss time constant nτ and Rc of a full-size ITER conductor have been studied under load for the first time. An important result is the significant decrease of nτ, after cyclic loading. It is also observed that the mechanical heat generation decreases with cycling. 相似文献
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