Magnetism and internal stresses : Concept of magneto-plastic anisotropy
International audience
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Preparation and Characterization of Fine‐Grained 3Y‐TZP/BaFe 12 O 19 In Situ Composites
Composites of BaFe 12 O 19 particles dispersed throughout a 3‐mol%‐yttria‐doped zirconia (3Y‐TZP) matrix have been prepared using the pressureless reactive sintering of 3Y‐TZP, BaCO 3 , and γ‐Fe 2 O 3 powders. The reaction behavior of the mixed powder was studied with an in situ , high‐temperature powder X‐ray diffrac…
Investigation of failure mechanisms in polymer composites by simultaneous measurement of ultra-small-angle scattering and acoustic emission during the deformation. I. Method
Failure mechanisms in polymer composites were investigated with the method of ultra-small-angle X-ray scattering using synchrotron radiation and acoustic emission analysis simultaneously. The composites were prepared from polystyrene filled with glass beads with different coatings. The two-dimensional scattering patte…
Determination of the Ce+3 bonding in the Ca0.5Sr0.5Ga2S4:Ce phosphor via x-ray photoelectron spectroscopy
The addition of oxygen in Ca0.5Sr0.5Ga2S4:Ce phosphor was found to nearly double the luminance and to blue shift the emission spectrum of the Ce+3 4f–5d transition. X-ray photoelectron spectroscopy (XPS) analysis was used to investigate the local chemistry of the Ce+3 luminescent center in the undoped and oxygen-doped…
Influence of Some Parameters on Passivation of Zirconium and the Stability of the Anodic Oxide Film
Passivation of the zirconium surface and stability of anodic oxide film were investigated as a function of surface preparation. The mechanically polished surface appeared to be more reactive toward oxide thickening than the etched one, as revealed by impedance measurements. Oxide film formed on the etched electrode di…
The Freedericksz transition as a bifurcation problem
We consider the effects of the application of electric and magnetic fields to a homogeneously aligned nematic liquid crystal which lies between parallel plates. The average alignment of the fluid molecules is known as the director and it is set parallel to the top and bottom bounding surfaces. At a critical field stre…
Crystal Structure, Infrared, and Polarized Raman Spectra of K3Sm(PO4)2
The low-temperature form of K3Sm(PO4)2 crystallizes in the monoclinic system [a = 7.4347(5) Å, b = 5.6270(5) Å, c = 9.4919(5) Å, β = 90.870(6)°, Z = 2, space group P21/m]. The structure has been determined using 1263 independent reflections (R = 0.045, Rw = 0.11) and is found to be of the glaserite type. The Raman and…
Growth of Barium Chlorapatite Crystals from a Sodium Chloride Flux
Abstract Large and well-formed crystals of barium chlorapatite [Ba5Cl(PO4)3] were grown for the first time from a sodium chloride flux. The solubility of Ba5Cl(PO4)3 in NaCl increased with increasing temperature, reaching about 1.9 mol% solubility at 1100 °C. The crystal growth of Ba5Cl(PO4)3 was conducted by heating…
Applications of shape memory alloys in Space Engineering: past and future
In this paper the over-thirty-years history of space applications of shape memory alloys (SMA) is summarized. Our experience is illustrated by detailed examples, such as the first launch of TiNi to an Earth orbit in 1982, when thermomechanical pipe couplings on the orbital station Salyut-7 were tested for their hermet…
Ion-motion disorder in a tysonite superionic conductor from 19F NMR data
The disorder in ion motion in a LaF 3 superionic conductor with tysonite structure is determined from NMR spectra. The method is sensitive to dynamic effects with correlation times of 5×10 −3 < τ <10 −6 s. Within the 260–400-K interval, ion movement is observed only on one of the sublattices (F 1 ), and it exhibits a…
Numerical Generation of Nanotube Caps II. Exact Results Up to (10, 10)
The numerical algorithm for cap generation [1] is further developed. the cap unfolding method proposed in ref. [2] is used. Some aspects of the cap unfolding onto the honeycomb lattice [3] are also considered. Topological invariants of the cap structures are used to eliminate the duplicate structures. the list of all…
Investigation of craze development using small-angle X-ray scattering of synchrotron radiation
The development of crazes in polycarbonate was investigated with the method of ultra-small-angle X-ray scattering (USAXS) of synchrotron radiation. Measurements at different temperatures and with different draw rates were carried out. The two-dimensional scattering patterns were analyzed by means of a fibrillar model…
Unexpected phase behavior of an asymmetric diblock copolymer
We report on measurements of the transmitted depolarized light intensity and on small-angle neutron scattering (SANS) measurements on a compositionally asymmetric poly(ethylene propylene)-poly(dimethylsiloxane) diblock copolymer studied in the bulk. SANS measurements were made both on isotropic and on shear oriented s…
Fundamental Study of Fluorinated Ethers as New Generation Blowing Agents
The development of blowing agents that exhibit lower thermal conductivity, shorter atmospheric lifetime, and less adverse effects on the atmosphere is an urgent issue. We investigated three fluorinated ethers as blowing agent alternatives [2,2,2-trifluoroethyl difluoromethyl ether (HFE-254mf), 2,2,3,3,3-pentafluoropro…
Piezoelectric and Mechanical Properties of BaBi4Ti4O15/Ba4Ti13O30 Ceramics
This article presents the piezoelectric and mechanical properties of bismuth layer-structured ferroelectrics (BLSF)-based BaBi 4 Ti 4 O 15 ceramics incorporating Ba 4 Ti 13 O 30 . The ceramic compositions, (1- x )BaBi 4 Ti 4 O 15 – x Ba 4 Ti 13 O 30 with x =0–100 vol%, are obtained through solid-state reaction process…
Specific heat of La[sub 1. 2]Sr[sub 1. 8]Mn[sub 2]O[sub 7]
The specific heat of a single crystal of the layered perovskite La[sub 1.2]Sr[sub 1.8]Mn[sub 2]O[sub 7] has been measured for 83[lt]T[lt]290 hthinsp;K. A high, narrow peak associated with the ferromagnetic ordering of the Mn[sup 3+]-Mn[sup 4+] ions is observed to have a maximum at T[sub c]=115.57 hthinsp;K, in agreeme…
Hydrothermal synthesis of amphiboles along the tremolite-pargasite join and in the ternary system tremolite-pargasite-cummingtonite
We report here an investigation of amphibole synthesis within the ternary system Ca 2 Mg 5 Si 8 O 22 (OH) 2 - NaCa 2 Mg 4 Al 3 Si 6 O 22 (OH) 2 -Mg 7 Si 8 O 22 (OH) 2 (= TR-PG-MC) to define better the limits of solid solution for amphiboles formed along and near the join tremolite-pargasite. Hydrothermal syntheses wer…
Molecular Hydrogen Production in the Radiolysis of High-Density Polyethylene
The production of molecular hydrogen in the radiolysis of high-density polyethylene by γ rays and heavy ion beams has been investigated. Only the slightest increase in the radiation chemical yield of 3.1 molecules/100 eV was found from γ rays to protons of 5−15 MeV. A gradual increase in yield was observed on further…
Effect of the electric conductivity on the drift velocity of the cholesteric fingers of the second type in confined geometry
We show that the drift velocity of the cholesteric fingers of the second species in ac electric field strongly depends on the conductivity of the liquid crystal chosen and exponentially vanishes above a cutoff frequency we found to be equal (within a numerical factor close to 1) to the charge relaxation frequency of t…
Electrical Properties of Microwave-Sintered ZnO Varistors
Bi 2 O 3 -based ZnO varistor materials were prepared by 2.45 GHz microwave, 24 GHz millimeter-wave or conventional sintering processes. Both millimeter-wave and microwave sintering processes are superior to the conventional sintering process for densifying Bi 2 O 3 -based ZnO materials. Moreover, the millimeter-wave s…