摘要:

It has been known that the preferred direction of the nematic director forp‐azoxyanisole in a low‐audiofrequency electric field is not always perpendicular to the field as predicted from the dielectric properties, and this unusual effect is associated with the ionic conductivity. Molecular alignment is related to the conductivity anisotropy by comparing the relative effectiveness of electric and magnetic fields to produce molecular alignment for different values of the ratio of the conductivities parallel and perpendicular to the nematic director.

ISSN:0021-8979    

DOI:10.1063/1.1662766

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

Polarization interference fringes caused by magnetic domain walls have been observed in FeBO3at specimen temperatures below 190 °K. A simple model, based on the observed magnetic field dependence and orientation of the fringes, suggests that the domain walls are the 120 ° Bloch type, lying a few degrees oblique to the basal plane.

ISSN:0021-8979    

DOI:10.1063/1.1662767

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

The reaction of iodine with silver at temperatures from 150 to 300 °C has been studied with a quartz crystal microbalance. Below 200 °C, the reaction approximately obeys the parabolic law and the reaction rate decreases with increasing temperature. Above 200 °C, the reaction obeys the linear law and its kinetic energy is roughly estimated to be 5 kcal/mole.

ISSN:0021-8979    

DOI:10.1063/1.1662768

出版商:AIP    

年代:1973

数据来源: AIP

摘要:

The precipitation of boron atoms in a silicon crystal which had been heavily implanted with boron ions at room temperature and then postannealed at high temperatures was studied by channeling analysis of the &agr;‐particles induced by the11B(p,&agr;)8Be nuclear reaction. It was found that boron atoms which exceed the solubility limit precipitate on ⟨110⟩ strings in the region of the highest boron concentration (around the boron ion range) with a lattice distance somewhat different from that of the host crystal after annealing at 900 °C.

ISSN:0021-8979    

DOI:10.1063/1.1662769

出版商:AIP    

年代:1973

数据来源: AIP