Epsteinet al.Respond
Received 3 October 1983DOI:https://doi.org/10.1103/PhysRevLett.51.2020©1983 American Physical Society
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Dynamics of Interfacial Pattern Formation
A phenomenological model of dendritic solidification incorporating interfacial kinetics, crystalline anisotropy, and a local approximation for the dynamics of the thermal diffusion field is proposed. The preliminary results are in qualitative agreement with natural dendritelike pattern formation.
Self-diffusion and antimony diffusion in tellurium
Self-diffusion in tellurium single crystals has been measured over the temperature range 496-640K using 127m Te as radiotracer and a sputtering technique for serial sectioning. Diffusion parallel to the c axis is described by D/sub /// T =6*10 -5 exp(-1.53 eV/kT) m 2 s -1 and perpendicular to the c axis by D perpendic…
The sodium tungsten bronzes: a study of the changes in electronic structure with composition using high-resolution electron spectroscopy
The variation with composition of the electronic structure of polycrystalline sodium tungsten bronzes Na x WO 3 (0<x<1) has been studied using a combination of high-resolution electron spectroscopic techniques. Samples on either side of the metal-nonmetal transition (x approximately 0.25 from conductivity data)…
Molecular dynamics and structures of amine boranes of the type R3N.BH3. II. NMR investigation of H3N.BH3
For pt.I see ibid., vol.16, p.6129 (1983). Proton second moment, T 1 H .T 1 rho H and T 1 11B measurements over the temperature range 330K>T>46K are reported. At low temperatures tunnelling of the protons of the NH 3 group influences the second moment and T 1 rho H results seriously. An analysis of the results h…
Molecular dynamics and structures of amine boranes of the type R3N.BH3. I. X-ray investigation of H3N.BH3at 295K and 110K
The results of an X-ray diffraction investigation of powdered H 3 N.BH 3 are reported. A first-order rotational order-disorder phase transition has been observed at 225K. In the high-temperature tetragonal phase the space group permits twelvefold reorientations of GH 3 and NH 3 groups. The cell parameters are linear f…
The effect of tensile stresses on the magnetic properties of Co58Fe5Ni10Si11B16 amorphous alloys
For the amorphous alloy of nominal composition Co53Fe5Ni10Si11B16 magnetic properties such as the anisotropy energy, the initial susceptibility, the coercive field, and the remanent magnetization are investigated at room temperatue as functins of an applied tensile stress. From an analysis of the magnetization process…
Physical properties and phase transitions of the rare earth monosulphides in the homogeneity range
The heat capacity (C), lattice constant (a), density (d), and electrical conductivity (σ) of RE monosulphides LnSx (Ln = La, Pr, Nd, and Gd) are studied in the homogeneity range (up to x = 0.80). A vacuum adiabatic calorimeter is used to measure C between 2 and 300 K. A systematic analysis of the experimental densitie…
Double excitation transitions inMn2+-doped alkali halides
It is shown in this work that the room-temperature excitation spectra of as-grown crystals of LiF, NaF, NaCl, KCl, and KBr doped with ${\mathrm{Mn}}^{2+}$ reveal the existence of double excitation peaks. These peaks are related to the formation of precipitated phases containing ${\mathrm{Mn}}^{2+}$ in the alkali halid…
Pyroelectric properties of the alanine and arsenic-doped triglycine sulfate single crystals
Arsenic-doped triglycine sulfate single crystals show an enhancement in pyroelectric coefficients and the pyroelectric figures of merit p/K and p/√K by a factor of 2.2 over those of pure triglycine sulfate single crystals at the most desirable operating temperature of the pyroelectric sensors, ≂25 °C. The crystals are…
Thermopower studies of a series of salts of tetramethyltetrathiafulvalene [(TMTTF)2X,X=Br, ClO4, NO3, SCN, BF4, AsF6, and PF6]
Thermoelectric power measurements on a group of tetramethyltetrathiafulvalene ${(\mathrm{TMTTF})}_{2}X$ salts show a wide variety of behavior. In the range of temperatures $300\ensuremath{\ge}T\ensuremath{\gtrsim}100$ K several of the salts ($X=\mathrm{B}{\mathrm{F}}_{4}, \mathrm{Cl}{\mathrm{O}}_{4}, \mathrm{N}{\mathr…
Rings in central-force network dynamics
The central-force network dynamics model for glasses is extended to treat networks involving small regular rings of bonds. In particular, band-limit formulas are obtained for an ${A}_{2}{X}_{3}$ glass consisting of regular puckered six-membered ${A}_{3}{X}_{3}$ rings. The special case of planar rings is compared with…
Static and dynamic behavior of the vortex–electrohydrodynamic instability in freely suspended layers of nematic liquid crystals
The vortex–electrohydrodynamic instability occurring in thin freely suspended layers of some nematic liquid crystals is investigated. The vortex pattern is observed both in the anisotropic and in the isotropic phase of the nematic liquid crystal. In this paper, we study the behavior of the vortex pattern when dc and a…
Metal—antiferromagnetic-insulator transition inV2O3alloys
Electrical resistivity measurements are reported for a variety of ${({\mathrm{V}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x})}_{2}{\mathrm{O}}_{3}$ and ${\mathrm{V}}_{2(1\ensuremath{-}y)}{\mathrm{O}}_{3}$ systems, with $0\ensuremath{\le}x<0.06$ and $0\ensuremath{\le}y<0.01$, in the range 20-300 K. The metal---antiferro…
Optical study of polypyrrole perchlorate
The optical transmittance spectra of polypyrrole perchlorate have been measured at various stages in the reduction to neutral polypyrrole at 300 and 120 K and at high pressure. Analysis of the results suggests that the polypyrrole chain is composed of conjugated segments of various lengths. The optical conductivity sp…
Diffusion in concentrated lattice gases. III. Tracer diffusion on a one-dimensional lattice
The dynamical process of the diffusion of tagged particles in a one-dimensional concentrated lattice gas is investigated. The particles are noninteracting except that double occupancy is forbidden. The mean-square displacement of a tagged particle is calculated for all times by an approximate theory and compared to re…
Electric-field profiles in electron-beam-charged polymer electrets
A recently developed method, which uses piezoelectrically generated pressure steps for the determination of electric-field profiles in dielectrics, has been applied to electron-beam-charged polyfluoroethylenepropylene (FEP) and polyethyleneterephthalate (PETP) electrets. The results indicate that the technique can be…
Stopping powers and extrapolated ranges for electrons (1-10 keV) in metals
A thin film quasiadiabatic calorimeter has been applied to the measurement of the stopping power for electrons, under conditions of small angle scattering, in Al, Ni, Cu, Ag and Au in the energy region 1 keV to 10 keV. Results are presented with an estimated precision of 15%. Corrections are included for the multiple…
Spectral chemistry of green glass‐bearing 15426 regolith
The detection of appreciable concentrations of ferric iron in a synthetic green glass equilibrated at an oxygen fugacity of 10 −11 atm prompted a Mossbauer spectral study of pristine emerald‐green glass spherules carefully handpicked from regolith sample 15426. No Fe 3+ ions were detected in this lunar sample or in a…
Neutron diffraction study of the crystal and magnetic structure of Rb2CrCl4: a two-dimensional ionic ferromagnet
The crystal and magnetic structure of Rb 2 CrCl 4 , a compound that exhibits two-dimensional ferromagnetism with nearly easy-plane behaviour, has been investigated using single-crystal neutron diffraction at 5.5, 77 and 300K. Selected Bragg reflections have also been examined at temperatures up to 573K. At all tempera…