摘要:

AbstractThis paper describes possibilities of several chemical preparations for the selective cleaning of InP surfaces. The investigations of the surface states after the chemical treatment were carried out by means of XPS measurements. A pre‐etching with (NH4)2S2O8:H2SO4:H2O and a polishing with 1% bromine in methanol produce optically smooth (100)‐ and (111) P surfaces free of oxi

ISSN:0232-1300    

DOI:10.1002/crat.2170230117

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractIn the paper a one‐dimensional method of calculation for temperature profiles in crystal growth furnaces is described. It is characterized by high flexibility. The model applied to our own calculations is based on heat balances in segments of a multi‐zone furnace and presupposes the availability of experimental data which allow the coefficients to be derived which are necessary to carry out the calculations. — The results of numerical calculations demonstrate the applicability of an existing furnace unit to directional crystallization of germ

ISSN:0232-1300    

DOI:10.1002/crat.2170230118

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractDielectric investigations in the kHz‐range on swallow‐tailed liquid crystals show a strong decrease of the dielectric constant as well as of the dielectric loss parallel to the nematic director with decreasing temperature. In the perpendicular direction no strong anomaly has been observed. By consideration of X‐ray data of the SAphase the dielectric results can be interpreted by the dipole‐dipole interaction which is forced by the anisotropy of repulsive forces of the respective mo

ISSN:0232-1300    

DOI:10.1002/crat.2170230119

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170230101

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY