ISSN:0232-1300    

DOI:10.1002/crat.2170200928

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170200929

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170200930

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170200931

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170200932

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

摘要:

AbstractA Model of spontaneous fluctuations of the limited spectrum solid state particle concentrations in the case of one‐component metallic macrosystems is considered. Within the small supercoolings' region of the melt‐crystal macrosystem a normal law of crystallization is established due to the action of fluctuation mechanism. For some metallic macrosystems a comparison on the crystallization kinetics between the theory and experiments has been realized. Some quantitative restrictions of the melt‐crystal system supercoolings' region within which the mechanism of spontaneous fluctuations is expected to be realized are established for a collection of one component metallic macrosystems. Two‐phase transitional zone length's influence on the values of admitted supercoolings in pr

ISSN:0232-1300    

DOI:10.1002/crat.2170200902

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

摘要:

AbstractIn a preceding paper a kinetic master equation has been derived describing the kinetics of atomic exchange processes that occur within the transition region separating a growing binary crystal and its nonsolid surrounding. For simple cubic structures, with the lattice sites being occupied by equal particle numbers of two components (in the case of perfect order corresponding to an NaCl‐type lattice) solutions for the steady‐state conditions have been derived. According to the solutions the long‐range order parameter is related to the atomic interaction energies, the arrival rate of particles at the crystal surface from the melt, and to temperature. A critical supercooling is predicted for the transition from a partly crdered structure to a disordered structure of the crystals growing from the melt. At the critical supercooling the temperature dependence of the crystallization rate reveals a characteristic c

ISSN:0232-1300    

DOI:10.1002/crat.2170200903

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

摘要:

AbstractThe three‐dimensional structure of 1β‐azido‐gibberellin A1monoetherate has been established by X‐ray analysis. The compound crystallizes from acetone‐diethylether in the monoclinic space group P21with two gibberellin and two diethylether molecules in the unit cell of dimensionsa= 7.799,b= 20.745,c= 8.036 Å, β = 110.23°. The finalR‐value is 0.059 for 2

ISSN:0232-1300    

DOI:10.1002/crat.2170200904

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

摘要:

AbstractSpecimens made of armco iron or pure iron were boronized during a time ≦; 1 minute with 1.1 vol.% BCl3in H2, and then their surfaces were investigated by scanning electron microscopy and X‐ray diffraction. The boride particles consist of FeB and Fe2B, they crow oriented on the substrate surface, e.g. the Fe2B (110) crystallographic plane is situated parallel to the (111) plane of α‐iron. The polycrystalline substrates are decorated by growing boride particles so that grains, twinning, etc. can be seen. There is a correlation between number per area and size of boride particles in early stages of layer formation and surface morphology in advanced layer

ISSN:0232-1300    

DOI:10.1002/crat.2170200905

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170200906

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY