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• W2016504684 abstract "The crystal structure sequence of the lanthanide metals when compressed or alloyed can be qualitatively explained by the participation of the 4f electrons in the bonding. A measure of this participation is given by the ratio of the metallic radius to the 4ƒ radius. It is shown that the f.c.c. phase is stable at radius ratio values less than 3.24, the d.h.c.p. phase between 3.28 and 3.54, the Sm structure (δ) between 3.60 and 3.65 and the h.c.p. for values greater than 3.68. The crystal structure of Pm is predicted. The existence of these structures in the pure metals as a function of pressure and in lanthanide solid solution alloys is discussed. The possibility of a 4ƒ contribution to the bonding in intermetallic compounds is discussed, and a test for showing whether or not this occurs in a morphotropic crystal structure series is proposed. On peut expliquer qualitativement la succession des structures cristallines des métaux lanthaniens comprimés ou mis en alliage par la participation à la liaison des électrons 4f. Une mesure de cette participation est fournie par le rapport du rayon métallique au rayon 4ƒ. On montre que la phase c.f.c est stable pour des valeurs du rapport de rayons inférieures à 3,24, la phase d.h.c entre 3,28 et 3,54, la structure Sm (δ) entre 3,60 et 3,65 et la structure h.c pour des valeurs supérieures à 3,68. On prévoit la structure cristalline de Pm. On discute l'existence de ces structures dans les métaux purs en fonction de la pression, ainsi que dans les solutions solides de lanthane. On discute la possibilité d'une contribution 4f à la liaison dans les composés intermétalliques et on propose une expérience montrant si cela se produit ou non dans les séries de structures cristallines morphotropiques. Die Kristallstrukturfolge der Lanthanidenmetalle bei Kompression oder Legierung kann qualitativ durch einen Beitrag der 4ƒ-Elektronen zur Bindung erklärt werden. Ein Maβ für diese Beteiligung ist das Verhältnis des metallischen Radius zum 4ƒ-Radius. Es wird gezeigt, daβ die k.f.z. Phase bei Werten des Radiusverhältnisses unterhalb 3,24 stabil ist, die d.h.c.p.-Phase zwischen 3,28 und 3,54, die SmStruktur (δ) zwischen 3,60 und 3,65 und die hexagonal dichtest gepackte Phase oberhalb 3,68. Die Kristallstruktur von Pm wird vorhergesagt. Die Existenz dieser Strukturen in den reinen Metallen in Abhängigkeit vom Druck sowie in Lanthanidenlegierungen wird diskutiert. Die Möglichkeit eines 4f-Beitrages zur Bindung in intermetallischen Verbindungen wird diskutiert. Ein Kriterium wird vorgeschlagen, welches zeigt, ob oder ob nicht dieser Beitrag in einer morphotropen Kristallstrukturserie auftritt." @default.
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• W2016504684 title "Concerning the crystal structure sequence in the lanthanide metals and alloys; evidence for contribution to the bonding" @default.
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• W2016504684 doi "https://doi.org/10.1016/0001-6160(68)90034-5" @default.
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