摘要:

The validity of employing an equivalent symmetrical anode for expressing the space‐charge‐limited current between nonsymmetrical electrodes is examined. It is shown that when the equivalent anode is determined by the capacitance, the error in the expression for the current is usually quite small and its approximate magnitude may often be anticipated. Exact expressions for the capacitance of some basic electrode arrangements are given, followed by a brief resume´ of corrections required for interpretation of experimental data.

ISSN:0021-8979    

DOI:10.1063/1.1722130

出版商:AIP    

年代:1955

数据来源: AIP

摘要:

The correlation of a neutron cross‐section plot in the cut‐off region and a diffraction pattern has been considered. The cross section for elastic scattering by a sample as determined from transmission experiments has been related to its diffraction pattern. A cross‐section plot can be transformed into a diffraction pattern by combining the cross section and its derivative. Examples of neutron cutoffs exhibiting strain and particle size broadening (carbonyl iron) and exhibiting particle size broadening alone (MgO) have been transformed. The patterns derived by the relation show good agreement with the x‐ray diffraction patterns. Cross‐section plots are sensitive to the state of crystalline perfection of the sample to the same degree as are diffraction patterns. Comparisons between the two should be made by performing the transformations given in the paper.

ISSN:0021-8979    

DOI:10.1063/1.1722131

出版商:AIP    

年代:1955

数据来源: AIP

摘要:

Nucleon irradiation of metallic solid solutions may lower their resistivity by changing the degree of randomness (tendency to order or to cluster) or by a change of elastic moduli. Measurements of resistivity of brasses containing 10, 20, and 30% zinc have been performed at room temperature, at 80°K and at 4°K. The alloys were irradiated in a reactor at +50°C and at 80°K. It appears that the results can be best interpreted in terms of the formation of lattice defects upon low temperature exposure and increase of short‐range order upon irradiation at +50°C. The change of residual resistivity is negative while the change of resistivity due to thermal scattering is positive for the samples irradiated at +50°C. The former depends upon irradiation flux and upon annealing time in a different manner from the latter. Short‐range order appears to be produced also by proper heat treatment.

ISSN:0021-8979    

DOI:10.1063/1.1722132

出版商:AIP    

年代:1955

数据来源: AIP

摘要:

An experimental investigation has been made of the dependence of the coercive force on the density of some magnetite and gamma ferric oxide powders consisting of different sized and shaped particles. Various aspects of the data are discussed. In particular, an interpretation based on a calculation of the critical single domain size of iron oxide particles with a prolate spheroidal shape is consistent with the experimental results.

ISSN:0021-8979    

DOI:10.1063/1.1722134

出版商:AIP    

年代:1955

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1722136

出版商:AIP    

年代:1955

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1722137

出版商:AIP    

年代:1955

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1722138

出版商:AIP    

年代:1955

数据来源: AIP