A Redetermination of the La-Ni Phase Diagram from LaNi to LaNi&lt;sub&gt;5&lt;/sub&gt; (50 to 83.3 at .%Ni)

Zhang, De Yuan; Tang, Jinke; Gschneidner, K. A.

doi:10.4028/www.scientific.net/msf.70-72.467

Cited by 6 publications

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“…Phase composition: La 2 MgNi 9 , PuNi 3 type (1); LaNi 5 , CaCu 5 type (2) and Gd 2 Co 7 types in the one-to-one ratio. The structure and composition of intermetallic phases in the La-Mg-Ni system are examined in detail in [11][12][13][14][15][16][17]. At the next stage, the as-cast and annealed La 2 MgNi 9 alloy was broken into several pieces and ground in a mortar or a ball mill in different conditions (grinding time 10, 30, and 60 min; mill rotation speed 150-250 rpm).…”

Section: Resultsmentioning

confidence: 99%

Phase-Structural and Electrochemical Properties of La2MgNi9 Alloys

Verbovitskii

Denis

Shtender

et al. 2015

Powder Metall Met Ceram

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Multiphase La 2 MgNi 9 alloys are synthesized by induction melting. The crystalline structures of all phases in the alloys are determined with X-ray diffraction. The La 2 MgNi 9 electrodes with nickel as a binder and electrical conductor are prepared and their charge-discharge characteristics are studied. The influence of homogenizing annealing and mechanical grinding on the discharge capacity and cyclic stability of the metal hydride (MH) electrodes is shown. The best electrochemical parameters are observed for powdered as-cast alloys.

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Section: Resultsmentioning

confidence: 99%

Phase-Structural and Electrochemical Properties of La2MgNi9 Alloys

Verbovitskii

Denis

Shtender

et al. 2015

Powder Metall Met Ceram

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“…The phase equilibria of the Ni–La binary system were measured by Zhang et al [26], Qi et al [27] and Buschow et al [28]. In the assessment by Okamoto [29] and Pan et al [30], there were four solution phases (liquid, fcc, bcc, dhcp) and nine intermediate phases (Ni 3 La 7 , NiLa 3 , NiLa, Ni 3 La 2 , Ni 16 La 7 , Ni 3 La, α-Ni 7 La 2 , β-Ni 7 La 2 , Ni 5 La).…”

Section: Literature Reviewmentioning

confidence: 99%

Experimental Investigation and Thermodynamic Calculation of Ni–Al–La Ternary System in Nickel-Rich Region: A New Intermetallic Compound Ni2AlLa

2018

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The phase equilibrium of the Ni–Al–La ternary system in a nickel-rich region was observed at 800 °C and 1000 °C using scanning electron microscopy backscattered electron imaging, energy dispersive X-ray spectrometry and X-ray diffractometry. The solubility of Al in the Ni5La phase was remeasured at 800 °C and 1000 °C. Herein, we report a new ternary phase, termed Ni2AlLa, confirmed at 800 °C. Its X-ray diffraction (XRD) pattern was indexed and space group determined using Total Pattern Solution (TOPAS), and the suitable lattice parameters were fitted using the Pawley method and selected-area electron diffraction. Ni2AlLa crystallizes in the trigonal system with a space group R3 (no. 146), a = 4.1985 Å and c = 13.6626 Å. A self-consistent set of thermodynamic parameters for the Al–La and Ni–La binary systems and the Ni–Al–La ternary system includes a Ni2AlLa ternary phase, which was optimized using the CALPHAD method. The calculated thermodynamic and phase-equilibria data for the binary and ternary systems are consistent with the literature and measured data.

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“…According to the different compound families, the binary ANi y systems (A = rare earths) can be smartly defined as stacking structures along one crystallographic axis of two subunits [A 2 Ni 4 ] and [ANi 5 ]. 4,5 Indeed, all phases reported in the binary La−Ni phase diagram for x Ni > 69 % 6,7 From a crystallographic point of view, except for m = 0 and +∞, there are two possible stacking sequences along the c-axis, leading either to a rhombohedral or hexagonal symmetry. Indeed, there are three stacking periods for the rhombohedral structure (3R) and two for the hexagonal one (2H).…”

Section: ■ Introductionmentioning

confidence: 99%

Experimental and Theoretical Investigations on the Influence ofAon the Hydrogen Sorption Properties ofANi_yCompounds,A= {Y, Sm, Gd}

et al. 2019

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The phase stability, electronic structure, magnetic and mechanical properties of ANi y compounds, A = {Y, Sm, Gd}, y = {2, 3, , , 4, 5}, and A 2Ni7H8 hydrides have been investigated by systematic first-principles calculations. Supported by a discussion to understand the role of A and y parameters, the results are compared with published and new experimental data regarding the heat of formation of some compounds and their hydrides. The main results can be summarized as follows: (i) ANi3 and A 2Ni7 are clearly stable by the density functional theory calculation, whereas the stability of ANi y for is not highlighted distinctively, in agreement with the difficulty to identify a single phase by experimental synthesis for some compounds such as Y5Ni19; (ii) ANi y compounds are found more rigid for A = Y and may explained the difficulty to observe Y5Ni19 in comparison with Sm5Ni19 and Gd5Ni19; and (iii) the calculated and measured heats of formation of A 2Ni7H8 hydrides are found in good agreement, around −25 to −30 kJ/mol-H2 according to the system.

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A Redetermination of the La-Ni Phase Diagram from LaNi to LaNi<sub>5</sub> (50 to 83.3 at .%Ni)

Cited by 6 publications

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Phase-Structural and Electrochemical Properties of La2MgNi9 Alloys

Phase-Structural and Electrochemical Properties of La2MgNi9 Alloys

Experimental Investigation and Thermodynamic Calculation of Ni–Al–La Ternary System in Nickel-Rich Region: A New Intermetallic Compound Ni2AlLa

Experimental and Theoretical Investigations on the Influence ofAon the Hydrogen Sorption Properties ofANi_yCompounds,A= {Y, Sm, Gd}

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A Redetermination of the La-Ni Phase Diagram from LaNi to LaNi<sub>5</sub> (50 to 83.3 at .%Ni)

Cited by 6 publications

References 0 publications

Phase-Structural and Electrochemical Properties of La2MgNi9 Alloys

Phase-Structural and Electrochemical Properties of La2MgNi9 Alloys

Experimental Investigation and Thermodynamic Calculation of Ni–Al–La Ternary System in Nickel-Rich Region: A New Intermetallic Compound Ni2AlLa

Experimental and Theoretical Investigations on the Influence ofAon the Hydrogen Sorption Properties ofANiyCompounds,A= {Y, Sm, Gd}

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Experimental and Theoretical Investigations on the Influence ofAon the Hydrogen Sorption Properties ofANi_yCompounds,A= {Y, Sm, Gd}