摘要:

A brief survey is given of the physical properties of the rare earth metals. In doing this their characteristic structural and magnetic behaviour is described first and this is then followed by an examination of the ways in which these features affect the other properties.

ISSN:0010-7514    

DOI:10.1080/00107517008202185

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

Many of the oxides and chalcogenides formed by the 3d transition metals and 4f rare-earth metals are antiferro-, ferri-and ferromagnetic semiconductors. In this review, several theoretical aspects of these materials are discussed, including electron correlation in narrow bands and the formation of electrostatic and magnetic polarons. The problems of crystal growth and physical measurement are briefly considered, together with recent studies on the conduction mechanism in typical compounds like NiO, MnO, ferrites, garnets, CdCr2Se4and EuS. Finally, we comment on possible applications.

ISSN:0010-7514    

DOI:10.1080/00107517008202186

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107517008202187

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

A comparison is made between the competing processes of x-ray scattering and photoelectric absorption. The latter topic is then developed more fully, particular attention being paid to absorption fine-structure and its relevance to the study of the unoccupied energy levels available to electrons in solids. Electron wave scattering theories of metal fine-structure are outlined, together with the simultaneous plasmon emission concept for transition metals and the bound ejected electron theory for the solid halides of potassium.

ISSN:0010-7514    

DOI:10.1080/00107517008202188

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

The Doppler shift in frequency of an ionospherically reflected radio wave can be used to study various ionospheric disturbances. In this article the experimental arrangement for measuring such a shift is described, and examples of frequency shifts associated with solar flares, geomagnetic variations and travelling disturbances are discussed.

ISSN:0010-7514    

DOI:10.1080/00107517008202189

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107517008202190

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

ISSN:0010-7514    

DOI:10.1080/00107517008202191

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor