Showing papers on "Antimonide published in 1972"
TL;DR: In this article, the physicochemical aspects of the synthesis of antimonide photocathodes are discussed, and the most usual process of synthesis occurs when a thin antimony film absorbs alkali-metal vapor.
Abstract: Publisher Summary This chapter focuses on some physicochemical aspects of the synthesis of antimonide photocathodes. For the preparation of antimonide photocathodes, four alkali metals: Na, K, Rb, and Cs are used. Lithium compounds have very low sensitivity and cannot be handled with the usual experimental techniques. Antimonides of the type A 3 Sb (A=alkali metal), in which the elements are in their normal valence state, have optimal photoemissive properties. The A 3 Sb compounds crystallize either in hexagonal or cubic form, but only the cubic compounds have a high photoelectric quantum efficiency. In the state of maximum photoelectric sensitivity, they have a slight stoichiometric excess of antimony and are p-type semiconductor. Antimonide photocathodes are synthesized by direct reaction between the elements. The affinity between alkali metals and antimony is quite strong, and therefore, the reactions are highly exothermic. The most usual process of synthesis occurs when a thin antimony film absorbs alkali-metal vapor. By monitoring a quasi-reversible synthesis, it can be learnt which intermediate products are instrumental in forming the photoemissive material. Homogeneous bialkali antimonide films cannot be obtained either by synthesis by substitution or by addition because the surface layers are richer in the last-added alkali metal.
6 citations
TL;DR: In this paper, nuclear magnetic resonance signals are observed from nuclei in domains and in domain walls in ferromagnetic manganese antimonide, and the observed broadening of the resonance lines is discussed.
Abstract: Nuclear magnetic resonance signals are observed from nuclei in domains and in domain walls in ferromagnetic manganese antimonide. Internal magnetic fields are measured at the manganese, antimony sites at 77 K and 296 K. The difference in the internal magnetic fields measured at the Sb site using the Sb 123 , Sb 121 resonances respectively could be explained to a hyperfine anomaly 121 Δ 123 =-(0.36±0.05)%. Resonance signals are also observed in Cr x Mn 1- x Sb ( x =0.01, 0.03 and 0.05). The observed broadening of the resonance lines is discussed.
5 citations
TL;DR: In this paper, a thin film of tin antimonide formed on NaCl substrates was found to exhibit three orientations, ((111)), ((110)) and ((211)), both independently and collectively.
3 citations
TL;DR: A scanning electron diffractometer used for the study of the antimony-caesium photocathode series is described in this article, which yields continuous structural and photoelectric information on a particular cathode with no necessity for removal from the preparation vessel.
Abstract: The paper discusses the design of a scanning electron diffractometer used for the study of the antimony-caesium photocathode series. The photocathode is prepared and examined in an ultra-high vacuum enclosure within the main diffractometer body. The instrument yields continuous structural and photoelectric information on a particular cathode with no necessity for removal from the preparation vessel. Preliminary results on Sb-Cs cathodes are given.
2 citations
Patent•
11 Jul 197201 Jan 1972
TL;DR: In this article, the thermodynamic properties of aluminum antimonide and the AlSb GaSb system by the electromotive force (emf) method using a solid electrolyte were studied.
Abstract: Thermodynamic data are frequently used in an analysis of the laws governing the change of properties ofA1II.Bv semiconducting compounds with change of pOSition of the constituent elements in the periodic table [1-3]. To resolve this problem, it is necessary to obtain sufficiently reliable data on the thermodynamics of the formation of such compounds. The thermodynamic properties of aluminum antimonide have been previously studied by the electromotive force (emf) method using aluminum chloride as the electrolyte in fused lithium and potassium chlorides [4]. The calculated value [4] of the standard entropy of solid aluminum antimonide Sg98 = 6.0 ± 0.8 eu/g-atom and that obtained by Piesbergen [5] from measurements of low-temperature specific heat, Bg98.16 = 7.68 ± 0.05 eu/ g-atom do not agree even within the limits of e1.!Perimental error (here, eu = entropy unit = cal! deg). For the isovalent solid solutions of AlII BV semiconductors, there are no published data on the free energy and the energy of their formation. We studied the thermodynamic properties of aluminum antimonide and the AlSb GaSb system by the emf method, using a solid electrolyte. The emf! s of the following galvanic cells were measured