Lanthanum nickelate

In a study of thermal stability and hydrogen sorption characteristics of a series of sorbent tablets composed of hydride-forming metals dispersed in polymers under a 50% hydrogen in argon atmosphere, it was found that tablets of 80% palladium in PTFE, and 80% of 1 5 atom lanthanum-nickel alloy in PTFE could not be used above 247° C because of explosive decomposition of the PTFE. 

The suitability of lanthanum nickelate as an SOFC cathode has been examined by Virkar s group [138], They showed that LN performed poorly as a single-phase cathode in an anode-supported YSZ cell. However, with an SDC/LN composite interlayer the performance of the LN cathode increased substantially and the maximum power density of the cell with a YSZ thin electrolyte (-8 pm) was -2.2 Wear2 at 800°C, considerably higher than 0.3 to 0.4 Wcm-2 of similar cells with only LN or SDC interlayer. The results are significant as it shows that the composite MIEC cathodes perform much better than single-phase MIEC in the case of LN despite its mixed ionic and electronic conductivity. 

Individually indexed alloys or intermetallic compounds are Aluminium amalgam, 0051 Aluminium-copper-zinc alloy, 0050 Aluminium-lanthanum-nickel alloy, 0080 Aluminium-lithium alloy, 0052 Aluminium-magnesium alloy, 0053 Aluminium-nickel alloys, 0055 Aluminium-titanium alloys, 0056 Copper-zinc alloys, 4268 Ferromanganese, 4389 Ferrotitanium, 4391 Lanthanum-nickel alloy, 4678 Lead-tin alloys, 4883 Lead-zirconium alloys, 4884 Lithium-magnesium alloy, 4681 Lithium-tin alloys, 4682 Plutonium bismuthide, 0231 Potassium antimonide, 4673 Potassium-sodium alloy, 4646 Silicon-zirconium alloys, 4910... 

Lanthanum-nickel alloy, 4678 Nickel, 4820 Palladium, 4885 Platinum, 4887 Rhodium, 4892 Ruthenium, 4894... 

In studies of the concentrations of arsenic, bromine, chromium, copper, mercury, lead and zinc in south-eastern Lake Michigan, it was shown that these elements concentrated near the sediment water interface of the fine-grained sediments. The concentration of these elements was related to the amount of organic carbon present in the sediments (161). However, it was not possible to correlate the concentration of boron, berylium, copper, lanthanum, nickel, scandium and vanadium with organic carbon levels. The difficulty in predicting the behaviour of cations in freshwater is exemplified in this study for there is no apparent reason immediately obvious why chromium and copper on the one hand and cobalt and nickel on the other exhibit such variations. However, it must be presumed that lanthanium might typify the behaviour of the trivalent actinides and tetravalent plutonium. 

Zijlstra et al. [69] demonstrated that the reaction of (1.5) is reversible at several bars of pressure at ambient temperature. In the following studies on the origin of magnetic coercivity in these new magnets, Phillips laboratories came with the hydride of LaNij, lanthanum-nickel hydride, which reversibly bonded more than six atoms of H per one formula unit (H/M ratio > 1) [70]. 

Elements determined but sometimes overlooked antimony, arsenic, bismuth, cadmium, coball, gallium, indium, lanthanum, nickel, palladium. rare earlhs (except cerium), rhodium, ruthenium, scandium, silver, tellurium, thallium, tin. and yttrium. 

Lanthanum—nickel alloy, 4673 Nickel, 4814 Palladium, 4879 Platinum, 4881 Rhodium, 3528 Ruthenium, 4888... 

FIGURE 25 Projection of the La4NijPb4 structure onto theab plane. Lanthanum, nickel, and lead atoms are drawn as medium gray, black filled, and open circles, respectively. The lead chains and the triangular nickel units are emphasized. The bottom drawing shows the polyhedra of coordination number 12 for the La2 (gray shading) and Pb2 atoms. 

Hydrides. According to X-ray and neutron diffraction and metallographic studies of the Nb-H system,524 the H may be considered a lattice gas with phase transitions. In the a-, a -, j6-, and -phases of the system, H occupies tetrahedral interlattice positions. Whereas direct reaction between niobium metal and hydrogen occurs only after repeated activation of the metal by hydrogen absorption at ca. 7 atm and 350 °C, NbH2 is formed at temperatures as low as 22 °C in mixtures of LaNi5H6 7 and Nb.525 The extraordinary catalytic effect of the lanthanum-nickel complex is attributed to the presence of surface-absorbed atomic hydrogen species which are able to diffuse into the niobium lattice. There has been a review of the T a-H system.526... 

Pan Y.Y., Nash P., La-Ni (Lanthanum-Nickel) , Phase Diagrams of Binary Nickel Alloys, P. Nash, Ed., ASM International, Materials Park, OH. - 1991. -P. 183-188. 

Lanthanum-nickel alloys are useful hydrogenation catalysts. The alloy LaNis readily absorbs large amounts of hydrogen. The catalysts are robust, hard to poison, are capable of repeated reuse, and operate under mild conditions. 

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