ISSN:0370-1972    

DOI:10.1002/pssb.2221870125

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

ISSN:0370-1972    

DOI:10.1002/pssb.2221870126

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

ISSN:0370-1972    

DOI:10.1002/pssb.2221870127

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

ISSN:0370-1972    

DOI:10.1002/pssb.2221870128

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

ISSN:0370-1972    

DOI:10.1002/pssb.2221870102

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

ISSN:0370-1972    

DOI:10.1002/pssb.2221870129

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

ISSN:0370-1972    

DOI:10.1002/pssb.2221870130

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractThe elastic diffuse neutron scattering from a Cu–17.2 at% Mn single crystal aged at 483 K to produce an equilibrium state of atomic short‐range order is measured at room temperature in a minimum separation volume of reciprocal space. Warren‐Cowley short‐range order parameters and coefficients of linear static displacement scattering are determined by least‐squares fitting. Effective pair potentials obtained from the short‐range order parameters by applying the inverse Monte‐Carlo method are used to calculate the diffuse antiphase boundary energy γAPB. For copper‐base alloys the concentration dependence of γAPBis one of the suggested reasons for the transition of wavy to planar slip. Based on the values of γAPB, the concentration ranges for the transition inCuMn,CuAl, andC

ISSN:0370-1972    

DOI:10.1002/pssb.2221870103

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractMössbauer spectra of β‐rhombohedral boron with interstitially distributed iron atoms up to 3.33 at% are presented. Taking into account that the six D sites in the unit cell are saturated by two Fe atoms, the distribution of the Fe atoms on A and D sites proved to be simply statistical. At lower Fe contents single iron atoms on A sites are ionized to Fe3+, while towards higher Fe contents a rapidly increasing share of Fe2+ions is found. On D sites the ionization of single Fe atoms is 2+, but it changes to 3+, when two Fe atoms are accommodated in the D sites of one unit cell. The isomer shift of the Mössbauer doublets yields an estimation of the electron transfer to the boron framework. Transition from p‐ to n‐type takes place, when six electrons per unit cell are transferred from the iron ions to the boron framework. This number corresponds to the sum of the unoccupied sites in the upper valence band and the possible electron traps generated by an electron–phonon interaction in the B12

ISSN:0370-1972    

DOI:10.1002/pssb.2221870104

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractA general theory of reflectivity by a perfect X‐ray multilayer mirror based on the usage of a recurrent relation is developed. The reflectivity is described by the well‐known Fresnel formulae which take into account jumps of susceptibility at the boundary between the layers. The analytical solution in the frame of the most general dynamical approach is found and the condition of application of the kinematical approximation is discussed. Special attention is paid to the periodic multilayer structure containing two layers of different materials with more than one pair of these layers in the per

ISSN:0370-1972    

DOI:10.1002/pssb.2221870105

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY