No abstract

a), M. A. BUNIN (a), 3%. A. BLOKHIN (a), V. I. MIXW (b), V. D. PROCHUKHAX (c), and G. K. AVERKIEVA (c) K-bands and absorption spectra of phosphorus and emission Le, 3-bands of silicon and phosphorusin MgSiP,, ZnSiP,, and CdSiP, are obtained. From a comparison of the spectra of different series and components in these compounds the influence of metal d-states on the valence band structure is studied. The admixture of phosphorus and zinc states to a metal d-state is estimated from the ZnSiP, spectra. Its smallness and the similarity of shape, position, and relative intensity of details of the corresponding spectra of all compounds are indicative of the fact that all metal d-states are only slightly hybridized with other states and only weakly affect the valence band structure. A sufficiently fair correspondence is revealed between the calculated spatial charge density distribution of valence electrons and the data about the localization and symmetry of electron states obtained from X-ray spectra. Good agreement between A E and E , is found ( A E is the energy gap between the emission ending and the onset of absorption of corrected P K-spectra, E , is the energy gap obtained by other physical methods). nOJIyYeHb1 K-nonocbI M CneKTpbI IIOrJIOJ.UeHMfi @OC@Opa, a TaHWe 3HMCCMOHHbIe Lz, 3-CneKTpOB pa3JIWlHbIX CepMfi M KOMnOHeHTOB 3 T M X COeEMHeHMfi II03BOJIHJlO MCCJIeXOBZiTb l) Prospekt Stilckki 192, 341090 Rostov-on-Don, USSR. 49 physica (b) loo/?

The Al h , s and Kp emission bands of noble and several transition metal aluminides have been investigated. I n the spectra of the alloys long-wavelength intensity peaks are observed which are not present in the spectrum of pure aluminium. The appearance of these peaks is Bseociated with the energy ban& originating from the d-states of the noble and transition metal atoms. For the Al ban& in CuAl,, Cu,Al, and PdAI, the position of the long-wavelength peaks relative to short-wavelength edges is found to correspond approximately to the position of the copper and palladium Lz,s-band peaks with respect to the absorption edges. It is aseumed that the energy region of the d-like bands in the vioinity of aluminium atoms contains an appreciable amount of states arising from the s and p aluminium atom states. This is suggested to be the reaaon for the long-wavelength intensity peaks to appear in the Al Lz,3-and Kp-bands of the alloys.Es wurden die Al-Lz,s-und Kp-Emissionsbanden der Edelmetall-und einiger ffbergangsmetallaluminide untersucht. I n den Legierungsspektren wurden einige langwellige Intensitiitsmaxima beobachtet, die in reinen Aluminium-Spektren nicht vorhanden sind. Daa Auftreten dieser Maxima ist verbunden mit Energiebiindern, die von den d-Zuetiindender Edel-und Ubergangsmetallatome stammen. Fiir die Al-Banden von 014, Cu,Al und PdAl, wird gefunden, daB die Lage der langwelligen Maxima beziiglich der kurzwelligen Kante niiherungsweise mit der Lage der Kupfer-und Palladium-Lz,s-Bandmaxima beziiglich der Absorptionskanten korrespondieren. Es wird die Annahme gemacht, daD der Energiebereich der d-ahnlichen Biinder in der Niihe der Aluminiumatome betriichtliche Beitrage von Zustiinden enthiilt, die aus s-und p-Aluminiumatomzustiinden stammen.Es wird angenommen, daB dies der Grund fiir das Auftreten der langwelligen Intensitiitsmaxima in den Al-h,s-und Kp-Banden der Legierungen auftreten.

The Al h , s and Kp emission bands of noble and several transition metal aluminides have been investigated. I n the spectra of the alloys long-wavelength intensity peaks are observed which are not present in the spectrum of pure aluminium. The appearance of these peaks is Bseociated with the energy ban& originating from the d-states of the noble and transition metal atoms. For the Al ban& in CuAl,, Cu,Al, and PdAI, the position of the long-wavelength peaks relative to short-wavelength edges is found to correspond approximately to the position of the copper and palladium Lz,s-band peaks with respect to the absorption edges. It is aseumed that the energy region of the d-like bands in the vioinity of aluminium atoms contains an appreciable amount of states arising from the s and p aluminium atom states. This is suggested to be the reaaon for the long-wavelength intensity peaks to appear in the Al Lz,3-and Kp-bands of the alloys.Es wurden die Al-Lz,sund Kp-Emissionsbanden der Edelmetall-und einiger ffbergangsmetallaluminide untersucht. I n den Legierungsspektren wurden einige langwellige Intensitiitsmaxima beobachtet, die in reinen Aluminium-Spektren nicht vorhanden sind. Daa Auftreten dieser Maxima ist verbunden mit Energiebiindern, die von den d-Zuetiinden der Edel-und Ubergangsmetallatome stammen. Fiir die Al-Banden von 014, Cu,Al und PdAl, wird gefunden, daB die Lage der langwelligen Maxima beziiglich der kurzwelligen Kante niiherungsweise mit der Lage der Kupfer-und Palladium-Lz,s-Bandmaxima beziiglich der Absorptionskanten korrespondieren. Es wird die Annahme gemacht, daD der Energiebereich der d-ahnlichen Biinder in der Niihe der Aluminiumatome betriichtliche Beitrage von Zustiinden enthiilt, die aus s-und p-Aluminiumatomzustiinden stammen.Es wird angenommen, daB dies der Grund fiir das Auftreten der langwelligen Intensitiitsmaxima in den Al-h,s-und Kp-Banden der Legierungen auftreten.