X-ray measurement of the thermal expansion of ammonium chloride
The lattice parameters of ammonium chloride have been measured at 31.5 and 54.0°C. The coefficient of linear expansion is found to be 58.5 × 10 −6 °C −1 .
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Laser Radiation-Induced, Residue-Free, Localized Decomposition of Some Plastics
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLaser Radiation-Induced, Residue-Free, Localized Decomposition of Some PlasticsLeo Parts, Edgar E. Hardy, and Margaret L. RodenburgCite this: Ind. Eng. Chem. Prod. Res. Dev. 1970, 9, 1, 21–26Publication Date (Print):March 1, 1970Publication History Published online1 May 2002…
Debris clouds behind plates impacted by hypervelocity pellets
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Impurity Magnons in MnF2:Ni
Fluorescence from the lowest spin orbital component of the 3T2 manifold of Ni ions in MnF2 is observed to terminate on the ground state 3A2 of the Ni with excitation of 0, 1, and 2 spin deviations centered on the nickel ion and corresponding, respectively, to the crystal ground state (G), and excitation of the s0 and…
Microwave Behavior of Partially Magnetized Ferrites
The high-frequency permeability of partially magnetized ferrites is calculated for some simple domain configurations, comprising only ``up''- and ``down''-domains. The method used is based upon the magnetostatic approximation and neglects exchange effects, but is otherwise substantially rigorous. The components of the…
The crystal structure of wardite
Summary Wardite, NaAl 3 (OH) 4 (PO 4 ) 2 . 2H 2 O, has a = 7·03 Å, c = 19·04 Å; space group P 4 1 2 1 2 or P 4 3 2 1 2. Its crystal structure was solved by a three-dimensional Patterson function computed using intensity data photographically collected by the Weissenberg method, and refined by successive Fourier maps a…
Molecular engineering in the design of microwave ferrimagnetic garnets
Recent advances in the study of microwave ferrites and garnets have resulted in a better understanding of the relationship between magnetic properties and the fundamental crystal structure. This article presents a review of the way in which the crystal structure of microwave garnets may be designed in order to realize…
Subsolidus Equilibria in the System ZrO 2 ‐WO 3 ‐P 2 O 5
The existence of stable and metastable forms of 2ZrO 2 ·P 2 O 5 and the subsolidus phase relations in the system ZrO 2 ‐ZrP 2 O 7 were confirmed before investigation of the ternary system. The synthesis and thermal behavior of ZrW 2 O 8 were reinvestigated, and the system WO 3 ‐P 2 O 5 was examined cursorily. A ternar…
Synthesis of poly‐2‐oxazolidones from diisocyanates and diepoxides
Abstract Poly‐2‐oxazolidones of high molecular weight have been synthesized from diisocy anates and diepoxides. The synthetic method was first developed for the model compound 3‐phenyl‐5‐phenoxymethyl‐2‐oxazolidone prepared from phenyl isocyanate and phenyl glycidyl ether. Conditions found most suitable for a high yie…
The effect of surface active agents on interphase mass transfer
Abstract The effect of various soluble and insoluble surface active agents on the absorption of ammonia into a static aqueous system was studied. Saturated straight‐chain hydrocarbons with four to twenty‐two carbon atoms and polar end groups were selected as the surface active agents to be studied. Alcohol, amine, and…
Field-Induced Spin Reorientation in ErCrO3
A field-induced spin reorientation has been observed in the weak ferromagnet, ErCrO3, at temperatures below the Néel point, TN=133.2°K. With a magnetic field, H, along the a axis of this orthorhombic compound, the spontaneous magnetization rotates from the c axis, at H=0, to the a axis, at H=Ht. The ``transition'' fie…
Thermal conductivity and thermoelectric power of heavily doped n-type silicon
Experimental values are given of the thermal conductivity and thermoelectric power of n-type silicon doped with phosphorus, antimony or arsenic, containing 4*10 19 to 6*10 25 m -3 electrons at room temperature, covering the range 4-300 degrees K. A theoretical treatment, using the variational method, suggests that the…
Magnetically Ordered Perovskites in the System La1−xCaxFe1− xMnxO3
A series of solid solutions with the general formula La1−xCaxFe1− xMnxO3, where x is from 0.0 to 1.0, have been synthesized and their structural, magnetic and electrical properties have been studied. Polycrystalline samples were prepared by the usual ceramic method, firing at 1350° under a flow of oxygen gas to keep t…
Antiferromagnetism in V2O3
Neutron diffraction measurements on powder and single-crystal samples of V2O3 have confirmed the existence of long-range magnetic order in the low temperature (monoclinic) phase. Paoletti and Pickart1 discovered an extra diffraction peak at low temperature which they attributed to nuclear scattering. A polarization an…
ECOLOGICAL OBSERVATIONS ON THE PLANKTONIC CYANOPHYTE GLEOTRICHIA ECHINULATA1
Gleotrichia echinulata was planktonic in Green Lake (Seattle, Washington) during summer, making its initial appearance between May and early July and disappearing during September. It apparently spent 8 to 10 months of the year on the bottom where colonies developed from spores deposited by the preceding year’s bloom.…
Control of RF Sputtered Film Properties Through Substrate Tuning
A means has been found to control the rf potential of the substrate during rf sputtering. The application of this technique to the deposition of silica films has been investigated in detail. The technique can be described as the use of an adjustable rf impedance between the substrate holder and ground electrodes, whic…
Some Chemical and Physical Factors Influencing Flame Retardancy
Information is given to explain why or how bromine or nitrogen contributes to phosphorus-containing flame retardants. Amide and amine nitrogen generally increase flame resitance, whereas, nitrile nitrogen can detract. Essentially, all of the phosphorus in a flame retardant is accounted for in the char or solid phase a…
Structural studies of the high temperature form of trans-1,4-polybutadiene crystal
It is known that trans-1,4-polybutadiene shows a crystal transformation at about 76°C. The crystal structure of the high-temperature form of trans-1,4-polybutadiene has been studied by X-ray diffraction. The chain conformation of the high-temperature form is similar to that of the low-temperature form. Above the cryst…
Model for Reverse-Domain Nucleation in Ferromagnetic Conductors
Recent reports indicate that the average dynamic domain size in a material undergoing a change in magnetization may be significantly smaller than the static domain size. This finer dynamic domain structure can be predicted by an application of the principle of minimum entropy production Eddycurrent dissipation and dis…
Spectrum of Volume Relaxation Times in B 2 O 3
Time‐index of refraction isotherms were measured for B 2 O 3 glass starting from both a high and a low temperature in the transformation region. The equilibrium index values at each temperature, obtained from both types of approach curve, were identical. As in the case of the density values, the equilibrium refractive…