ChemInform Abstract: THERMODYNAMISCHE EIGENSCHAFTEN VON 3LA2O3.WO3 BEI ERHOEHTEN TEMPERATUREN

Abstract

Die EMK der Konzentrationskette Abei 1200‐1450°C wurde gemessen und daraus für Reaktion Bdie Änderung der Freien Enthalpie berechnet.

Mo-Substituted Lanthanum Tungstate La28–yW4+yO54+δ: A Competitive Mixed Electron–Proton Conductor for Gas Separation Membrane Applications

“…At high temperatures, these materials are mixed ionic-electronic conductors exhibiting n-and p-type electronic conductivity under reducing and oxidizing atmospheres respectively, making them interesting as dense membranes for hydrogen separation. One of the main advantages of these materials is that they present high tolerance toward CO 2 , in contrast to alkaline-earth containing perovskites, based on thermodynamic data from Chentsov et al 9 Recent investigations showed that lanthanum tungstate with a La/W = 6 ratio (usually written as La 6 WO 12 or 3:1 La 2 O 3 − WO 3 ) is not a single phase. 7,10,11 A solid solution was found for compositions with La/W ratio between 5.3 and 5.7 after firing at 1500 °C.…”

“…At high temperatures, these materials are mixed ionic-electronic conductors exhibiting n- and p-type electronic conductivity under reducing and oxidizing atmospheres respectively, making them interesting as dense membranes for hydrogen separation. One of the main advantages of these materials is that they present high tolerance toward CO 2 , in contrast to alkaline-earth containing perovskites, based on thermodynamic data from Chentsov et al…”