摘要:

AbstractSolving dopants from the silicon surface into the volume during epitaxial layer growth is commonly described as a solution equilibrium, which forms an essential part of modelling intentional silicon doping. Above buried layers a so‐called redistribution autodoping causes the inversely directed process within an initial layer growth period. When the layer begins to grow, the dopants are not totally buried by the silicon deposited, but are partially swept towards the surface to develop the redistribution equilibrium. Above that part of the layer surface located above buried layers, simultaneously a certain dopant partial pressure is established. It gives rise to a vertical and lateral dopant transport by means of gas diffusion. The flow in lateral direction is considered the source of lateral autodoping. In the present paper a theoretical model of autodoping is developed and the layer deposition parameters are discussed with regard to minimizing autodoping effect

ISSN:0232-1300    

DOI:10.1002/crat.2170211202

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractIn the paper which is divided into three parts the liquid phase epitaxy of SiC by temperature gradient zone melting with the solvent SiTb is discussed. In the first part the solubility of SiC at different initial compositions of the SiTb solvent is studied in the temperature range 2000–2

ISSN:0232-1300    

DOI:10.1002/crat.2170211203

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170211204

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractThe liquid phase epitaxy of SiC by the gradient temperature zone melting in the SiTb solvent is studied. A new variant of this growth method is presented. The comparison of the new variant with the previous one shows that the new variant allows for epitaxial layers with significant better electrophysical properties. It is easier and can be carried out at lower temperatur

ISSN:0232-1300    

DOI:10.1002/crat.2170211205

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170211206

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractThe crystal of Kaersutite, (Na0.63K0.37Ca1.99) (Mg3.10Fe0.98Al0.51Mn0.01Ti055) (Si6.07Al1.93) (O, OH)24from lecality Vlčí Hora – Bohemia was studied by powder neutron diffraction.The refinement of the crystal structure within space group C2/m gave cell dimensionsa= 0.9863,b= 1.8040 andc= 0.5306 nm, β = 105° 28′,Z= 2. Protons were found to form bridges between two 03 ioxygens. (This location allows for the existence of proton per f.u. in maximum). The actual population was refined to 0.8. The occupation of the five eation sites was determined as follows: M 1 (0.60 Mg + 0.25 Ti + 0.10 Al + 0.05 Fe), M 2 (0.50 Mg + 0.35 Fe + 0.15 Al), M 3 (0.8 Mg + p.2 Fe), M 4 (Ca) and A

ISSN:0232-1300    

DOI:10.1002/crat.2170211207

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170211208

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractThe X‐ray diagrams of the title compound show pronounced maxima on diffuse streaks parallelc* and unusual extinctions. The intensity distribution is compatible with the assumption of a disordered (OD) structure consisting of one kind of layers. The structure contains ordered domains with the crystal data: monoelinic, space group P 21/a, lattice parametersa= 15.910(5),b= 8.365(4),c= 15.747(5) Å, β = 120.34(6)°,V= 1809 Å3,Z= 8,Mr= 195.1,Dx= 1.432 Mg m−3, μ(MoKα) = 0.36 mm−1, finalR= 0.129 for 859 observed reflections. The asymmetric unit is constituted of two crystallographically independent molecules related by a pseudo glide plane. The crystal used for X‐ray analysis proved

ISSN:0232-1300    

DOI:10.1002/crat.2170211209

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170211210

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractA supplementary device to a scanning electron microscope allows the simultaneous taking of wide‐angle interferences in the directions of transmission and back reflection of identical specimen areas. A developed computer program simulates the complete reflex system so that the identity with the pattern is obtained. This results, on the one hand, in qualitative and quantitative statements concerning the real structure of the specimen and, on the other hand, shadings of reflexes caused by the target holder tube can be distinguished from interruptions of reflexes caused by the grain size effects. The efficiency of the supplementary device for the characterizing of mono‐ and polycrystalline specimens is demonstrated by several examp

ISSN:0232-1300    

DOI:10.1002/crat.2170211211

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY