Dissociation Energy of the Molecule TiO(g) and the Thermodynamics of the System Titanium–Oxygen
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Photoluminescence in SrTiO3
At 77 K photoluminescence from nominally pure, 0.05% Sm-doped and 0.005% Cr-doped SrTi${\mathrm{O}}_{3}$ gives identical spectra in the infrared (I.R.) with an intensity ratio of 1:20:400, respectively. In undoped and Sm-doped specimens, the intensity of emission is vanishingly weak at 4 K, in contrast to Cr-doped SrT…
Optical Properties of Tellurium in the Fundamental Absorption Region
An analysis has been made of the optical absorption edge and reflectivity spectrum of single-crystal tellurium. Transmission measurements, using polarized light, were made between 10 and 300\ifmmode^\circ\else\textdegree\fi{}K covering a range of absorption coefficient from 0.4 ${\mathrm{cm}}^{\ensuremath{-}1}$ to 5\i…
Optical Absorption ofY3Al5O12from 10- to 55 000-cm−1Wave Numbers
The optical absorption coefficient of synthetic single crystals of the garnet ${\mathrm{Y}}_{3}$${\mathrm{Al}}_{5}$${\mathrm{O}}_{12}$ has been measured from photon wave numbers of 10 to 55 000 ${\mathrm{cm}}^{\ensuremath{-}1}$ at 300\ifmmode^\circ\else\textdegree\fi{}K. The wave-number range 10 to 900 ${\mathrm{cm}}^…
Optical Study of CaF2:Ho+3
The spectral distribution of the thermoluminescent glow peaks at 155, 206, and 333\ifmmode^\circ\else\textdegree\fi{}K and the room-temperature phosphorescence have been measured in Ca${\mathrm{F}}_{2}$: ${\mathrm{Ho}}^{+3}$ following x irradiation. The emission comprises about sixteen lines between 5300 and 5600 \AA{…
Mössbauer Study of Metamagnetic Transition in FeCl2and FeBr2
The metamagnetic (spin-flop) transition is studied in single crystals of Fe${\mathrm{Cl}}_{2}$ and Fe${\mathrm{Br}}_{2}$ using the M\"ossbauer effect and external magnetic fields up to 40 kG. From the changes which take place in the $m=\frac{1}{2}\ensuremath{\rightarrow}{m}^{*}=\frac{3}{2}$ and $m=\ensuremath{-}\frac{…
Nuclear-Magnetic-Resonance Studies of Ferroelectricity in Normal and Irradiated Rochelle Salt
The ferroelectric properties of Rochelle salt have been studied by means of two new techniques based on the ${\mathrm{Na}}^{23}$ NMR. In the first technique, the separation between a pair of ${\mathrm{Na}}^{23}$ quadrupolar satellites is used as a measure of the spontaneous polarization of the crystal. Using this meth…
Ultrasonic Velocity and Attenuation in KH2PO4
The velocity and attenuation of ultrasonic shear waves have been investigated at temperatures above ${T}_{C}={121.8}_{2}\ifmmode^\circ\else\textdegree\fi{}$K in single-crystal KDP. An elastic Curie-Weiss law, $({{s}_{66}}^{E}\ensuremath{-}{{s}_{66}}^{P})=\frac{D}{(T\ensuremath{-}{T}_{C})}$, is obtained with an elastic…
Study of Critical Fluctuations in BaTiO3by Neutron Scattering
Neutron scattering from BaTi${\mathrm{O}}_{3}$ crystal has been investigated in the critical region (${T}_{c}=130\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}<T<270\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$) above the ferroelectric Curie temperature. In this temperature range, strong quasi-elastic scattering…
Effects of Pressure on the Magnetic Properties of MnAs
Using a vibrating-coil magnetometer, we have studied the effect of hydrostatic pressures of up to 11 kbar on the magnetic properties of MnAs. These experiments were carried out between 60 and 500\ifmmode^\circ\else\textdegree\fi{}K. The boundary between the ferromagnetic hexagonal ($B{8}_{1}$) phase and the orthorhomb…
Lattice-Dynamical Study of the 110°K Phase Transition in SrTiO3
The lattice-dynamical characteristic of the 110\ifmmode^\circ\else\textdegree\fi{}K transition in SrTi${\mathrm{O}}_{3}$ has been elucidated by inelastic neutron scattering measurements. The transition is caused by a ${\mathrm{T}}_{25}$ soft-phonon mode at the [111] zone boundary, confirming the model recently propose…
Photo-Ionization of Krypton Between 300 and 1500 eV. Relative Subshell Cross Sections and Angular Distributions of Photoelectrons
Energy spectra of electrons ejected from $M$ and $N$ subshells of krypton by characteristic x rays of 300 to 1500 eV energy have been measured with an electrostatic analyzer. Krypton was irradiated in the gas phase and electrons were detected perpendicular to the x-ray beam. From these spectra, relative subshell contr…
Revision de Proetus (Proetus) oehlerti Bayle 1878 (Proetidae, trilobite)
Abstract At least two distinct species, Proetus baylei n. sp., Nehou, Manche, France
Thermal decomposition of cyclopentyl and cyclohexyl acetates
The rate constants k1(sec.–1) for the thermal decompositions of cyclopentyl and cyclohexyl acetates in the presence of cyclohexene are 1012·89 exp (–44,110/RT) at 315–367° and 1012·59 exp (–45,190/RT) at 337–398° respectively. The decompositions are homogeneous and unimolecular in the seasoned Pyrex vessel. The relati…
Fractographic Studies on the Cleavage Fracture of Single Crystals of Iron
A critical experiment is presented for the mechanisms of initiation and propagation of cleavage crack in iron. At first, precise fractographic observations are made on the type of the origin of crack observed on single crystals of iron with notch. A number of cleavage facets are started from the boundary of a twin, an…
The Utility of Linear Polarization Method For The Determination of The Corrosion Rate
Bu çalışma linear polarizasyon metodunun bu günkü durumunu ve bugüne kadar korozyon hızı tayinine uygulanmasını göstermektedir. Bu metodun çok pra¬tik ve faydalı olduğu gösterilmiştir. Metodun genel bir uygulama alanı göstermesi ve uygulanmasının kolay olması büyük bir avantaj sağlamaktadır. Bu metotla ko¬laylıkla kor…
On Quench Sensitivity of Cu-Cr Alloys
A study was made on the quench sensitivity of Cu-0.3∼1.5%Cr alloys. The time-temperature-precipitation curve (T-T-P curve) was drawn by plotting the electrical conductivity of specimens which were solution treated and then directly quenched over the temperature range of isothermal heat treatment. The quench sensitivit…
The Role of Wire Size in Negative Electrical Discharge at High Temperature
Negative corona onset and sparkover voltages in air are shown to be affected by temperature, density, and the pipe-to-wire ratio of radii when using concentric cylindrical electrodes. Use of large wires at high temperatures demonstrates that onset of electrical discharge occurs at voltages significantly less than thos…
Analytic Form of Stress Fields, Displacements, and Dilation for the 〈111〉Dislocation in Anisotropic Elasticity
Abstract Screw, edge, and mixed dislocations are treated by a new method which is simple to handle. Labour saving equations are derived which further shorten the algebraic processes. The results emphasize the need for anisotropic expressions in the case of common cubic materials, and are presented in a form which show…
Differential Reflection Spectra of Heavily Doped Silicon and Germanium in the Ultraviolet Spectral Region
Abstract The effect of heavy doping on the reflection spectra of silicon and germanium is investigated by measuring the fractional change in reflectance, Δ R / R , between pure and doped materials. This effect arises from the narrowing of the forbidden gap in heavily doped materials. The form of the Δ R / R spectrum a…