Sc, Y, La-Lu, Rare Earth Elements: Compounds with Boron by Hiltrud Hein, Claus Koeppel, Ursula Vetter, Eberhard

By Hiltrud Hein, Claus Koeppel, Ursula Vetter, Eberhard Warkentin (auth.), Dr. Hartmut Bergmann, Gerhard Czack, Hiltrud Hein, Sigrid Ruprecht, Ursula Vetter (eds.)

The quantity "Rare Earth parts" C eleven bargains with the compounds and structures of the infrequent earth parts with boron, Le., borides, borates, and linked alkali double compounds. As in all previous volumes of "Rare Earth parts" Se ries C ("Seltenerdelemente" Reihe Cl, comparative info are awarded in sections previous remedy of the person compounds and structures. issues of the current quantity C eleven aare the comparative info at the borides and the indiĀ­ vidual sections at the structures and borides containing Sc, Y, and los angeles. the person sections for the platforms and borides with Ce to Lu are available within the following quantity C eleven b including the borates, their alkali double compounds, and different compounds containing Ce to Lu, boron and components similar by way of the Gmelin approach. the main generally studied borides taken care of within the comparative sections are of the kind MB. those infrequent earth hexaborides are refractory compounds and so me of them, in particular e LaBe, are reliable thermionic emissive fabrics or show different attention-grabbing actual properties.

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Mixtures of B20 3 and C ean be used instead of B4C in aeeordanee with the equation 2 B20 3 + 7C-+B4C+6CO [29]. 5C or ce0 2+ 6 H3 B03 + 11 C roasted at 2173 to 2273 K led to LaBe or CeBe plus ternary M-C-B eompounds. 5 wt% C, see Vekshina et al. [39]. Magnesothermic Method Hexaborides MBe (M = La, Ce, Gd, Eu) of ca. 9% purity were obtained via MnO m + 3n B20 3 + (m + 9n) Mg -+ nMBe+ (m + 9n) MgO as folIows: Appropriate mixtures of borie acid (H 3 B03 ) and M20 3 (or M02 for M=Ce), dehydrated by slow heating to 1073 K, were mixed with the stoiehiometrie amount of Mg.

65/70; Soviet Powder Met. Metal Ceram. 1964406/9). [48] Markov, Yu. ; Trokhina, G. ; Zernova, E. ; Maksimovskii, V. V. (Izv. Akad. Nauk SSSR Neorgan. Materialy 14 [1978] 79/81; Inorg. Materials [USSR] 14 [1978] 61/3). [49] Hoyt, E. W. (Proc. 2nd Conf. , 1961 [1962], pp. A. 16 [1962] No. 32072). [50] Davis, P. ; Swanson, L. ; Hutta, J. ; Jones, D. L. (J. Mater. Sci. 21 [1986]825/36). ; Sikirica, M. (New NucL. Mater. IncL. Non-MetaL. Fuels Proc. , Prague 1963, VoL. 2, pp. A. 60 [1964] 10192). ; Kawai, S.

1961 1338). [46] Samsonov, G. V. (Tugoplavkie Soedineniya Redkozemel'nykh Metallov s Nemetallami, Metallurgiya, Moscow 1964; High-Temperature Compounds of Rare Earth Metals with Nonmetals, Consultants Bureau, New York 1965, pp. 1/280, 50/60). [47] Arabei, B. ; Shtrom, E. ; Lapitskii, Yu. A. (Poroshkovaya MetaL. 1964 No. 5, pp. 65/70; Soviet Powder Met. Metal Ceram. 1964406/9). [48] Markov, Yu. ; Trokhina, G. ; Zernova, E. ; Maksimovskii, V. V. (Izv. Akad. Nauk SSSR Neorgan. Materialy 14 [1978] 79/81; Inorg.

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