Cadmide des Natriums

Abstract

Mit 1 Figur im Text und 2 Tafeln. Durch fruhere Untersuchungen ist gezeigt worden, dals das metallische Cadmium mit Natrium mehrere bestimmte Verbindungen bildet , die in ihren Eigenschaften an die analogen Quecksilberderivate erinnern. Die charakteristischen Verbindungen NaCd,, NaHg,, KHg,, zu denen Maxima der Schmelztemperaturen in den entsprechenden binaren Systemen gehoren , einem und demselben chemischen RM,, wo R = Na, K; M = Hg, Cd ist. TYPus Die vorliegende Arbeit weist nach, d d s diese Ubereinstimmung der Typen auch bei anderen Verbindungen des Cadmiums mit Natrium beobachtet werden kann. Hier zeigt sich ganz deutlich die nahe Analogie im Verhalten des Cadmiums und Quecksilbers als Metallen der zweiten Gruppe des periodischen Systems. Wir benutzten fur unsere Untersuchung die Schmelzmethode und das Studium der Mikrostruktur. 1. Das Schmelzdiagramm. Zur Herstellung der Schmelzen wurden zu einer bestimmten, in einem eisernen Tiegel unter einer Paraffinschicht geschmolzenen Menge Natrium abgewogene Portionen Kadmium hinzugefugt ; das Vorgetragen in der chemischen Abteilung der Russ. phys.-chem. Ges. in der Sitzung vom 2. Febr. 1906. * Aus dem Russischen iibersetzt von w. LoEwENsTAMM-Hamburg.

Thermodynamic optimization of the Cd–Na and Cd–Tl binary systems

“…Both works showed the presence of Cd 2 Na which melts congruently at 658 K [5] and 657 K [4], respectively, but the presence of the other compound is not conclusive. It was reported by Mathewson [5] that a compound, Cd 5 Na, exists and melts congruently at 633 K. However, Kurnakow and Kusnetzow [4] proposed a maximum of the liquidus at 636 K for Cd 6 Na. Later, Kornienko and Zhuravlev [6] reported the existence of Cd 11 Na 2 by thermogravimetric analysis.…”

“…The results of Mathewson [5] covered the mole fraction of Na up to about 0.85, while those of Kurnakow and Kusnetzow [4] were for the whole composition range. Moreover, Kurnakow and Kusnetzow [4] as well as Mathewson [5] reported temperatures and compositions for relevant invariant reactions.…”

“…The results of Mathewson [5] covered the mole fraction of Na up to about 0.85, while those of Kurnakow and Kusnetzow [4] were for the whole composition range. Moreover, Kurnakow and Kusnetzow [4] as well as Mathewson [5] reported temperatures and compositions for relevant invariant reactions. Both works showed the presence of Cd 2 Na which melts congruently at 658 K [5] and 657 K [4], respectively, but the presence of the other compound is not conclusive.…”

“…Moreover, Kurnakow and Kusnetzow [4] as well as Mathewson [5] reported temperatures and compositions for relevant invariant reactions. Both works showed the presence of Cd 2 Na which melts congruently at 658 K [5] and 657 K [4], respectively, but the presence of the other compound is not conclusive. It was reported by Mathewson [5] that a compound, Cd 5 Na, exists and melts congruently at 633 K. However, Kurnakow and Kusnetzow [4] proposed a maximum of the liquidus at 636 K for Cd 6 Na.…”

“…Kurnakow and Kusnetzow [4] as well as Mathewson [5] measured the phase equilibria by thermal analysis. The results of Mathewson [5] covered the mole fraction of Na up to about 0.85, while those of Kurnakow and Kusnetzow [4] were for the whole composition range.…”