Interaction of hydrogen with the LaNi4.9In0.1, LaNi4.8In0.2 and LaNi4.8 alloys and their Nd analogues
Identifieur interne : 008972 ( Main/Repository ); précédent : 008971; suivant : 008973Interaction of hydrogen with the LaNi4.9In0.1, LaNi4.8In0.2 and LaNi4.8 alloys and their Nd analogues
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Abstract
The single phase nature of the alloys LaNi4.9In0.1, LaNi4.8In0.2, NdNi4.9In0.1, NdNi4.8In0.2 of the systems LaNi5-xInx and NdNi5-xInx was confirmed by means of X-ray powder diffractometry. Nonstoichiometric alloys LaNi4.8 and NdNi4.8 were prepared and were also found to be good single phase materials. All these alloys crystallize with the same hexagonal structure of the CaCu5 type (space group P6/mmm) as do their prototypes LaNi5 and NdNi5. In order to determine the interaction with hydrogen the alloys were exposed to hydrogen gas and the pressure composition desorption isotherms were measured. It was found that all alloys react readily and reversibly absorb large amounts of up to 6.54 hydrogen atoms per alloy formula unit. Generally the equilibrium pressure and the hydrogen capacity decrease with the decreasing nickel content. Presence of indium in the alloy acts in favour of these trends. Furthermore, the increasing content of indium in the alloy system drastically alters the slope and the pressure of the plateau observed at higher pressure of the two isotherm plateaux of the NdNi5-hydrogen system. The final result is a merge of both plateaux into a single one for the hydrogen desorption isotherms of NdNi4.8In0.2. However, the isotherms of nonstoichiometric NdNi4.8 still exhibit two separated pressure plateau regions. The thermodynamic parameters of hydride formation, i.e., the entropy change, the enthalpy and the Gibbs free energy of formation have also been extracted for all alloy-hydrogen systems.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Interaction of hydrogen with the LaNi<sub>4.9</sub>In<sub>0.1</sub>, LaNi<sub>4.8</sub>In<sub>0.2</sub> and LaNi<sub>4.8</sub> alloys and their Nd analogues</title><author><name sortKey="Drasner, A" uniqKey="Drasner A">A. Drasner</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratory for Solid State Chemistry, Division of Materials Chemistry, Institute Ruder Boškovic, PO Box 180</s1><s2>10002 Zagreb</s2><s3>HRV</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Croatie</country><wicri:noRegion>10002 Zagreb</wicri:noRegion></affiliation></author><author><name sortKey="Blazina, Z" uniqKey="Blazina Z">Z. Blazina</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratory for Solid State Chemistry, Division of Materials Chemistry, Institute Ruder Boškovic, PO Box 180</s1><s2>10002 Zagreb</s2><s3>HRV</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Croatie</country><wicri:noRegion>10002 Zagreb</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="inist">06-0357000</idno><date when="2006">2006</date><idno type="stanalyst">PASCAL 06-0357000 INIST</idno><idno type="RBID">Pascal:06-0357000</idno><idno type="wicri:Area/Main/Corpus">008C30</idno><idno type="wicri:Area/Main/Repository">008972</idno></publicationStmt><seriesStmt><idno type="ISSN">0925-8388</idno><title level="j" type="abbreviated">J. alloys compd.</title><title level="j" type="main">Journal of alloys and compounds</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Desorption</term><term>Gas solid reaction</term><term>Hydrides</term><term>Hydrogen storage</term><term>Lanthanum alloy</term><term>Neodymium alloy</term><term>Non stoichiometric composition</term><term>Thermodynamic properties</term><term>X ray diffraction</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Diffraction RX</term><term>Composition non stoechiométrique</term><term>Propriété thermodynamique</term><term>Désorption</term><term>Stockage hydrogène</term><term>Réaction gaz solide</term><term>Néodyme alliage</term><term>Lanthane alliage</term><term>Hydrure</term><term>65</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The single phase nature of the alloys LaNi<sub>4.9</sub>In<sub>0.1</sub>, LaNi<sub>4.8</sub>In<sub>0.2</sub>, NdNi<sub>4.9</sub>In<sub>0.1</sub>, NdNi<sub>4.8</sub>In<sub>0.2</sub> of the systems LaNi<sub>5-x</sub>In<sub>x</sub> and NdNi<sub>5-x</sub>In<sub>x</sub> was confirmed by means of X-ray powder diffractometry. Nonstoichiometric alloys LaNi<sub>4.8</sub> and NdNi<sub>4.8</sub> were prepared and were also found to be good single phase materials. All these alloys crystallize with the same hexagonal structure of the CaCu<sub>5</sub> type (space group P6/mmm) as do their prototypes LaNi<sub>5</sub> and NdNi<sub>5</sub>. In order to determine the interaction with hydrogen the alloys were exposed to hydrogen gas and the pressure composition desorption isotherms were measured. It was found that all alloys react readily and reversibly absorb large amounts of up to 6.54 hydrogen atoms per alloy formula unit. Generally the equilibrium pressure and the hydrogen capacity decrease with the decreasing nickel content. Presence of indium in the alloy acts in favour of these trends. Furthermore, the increasing content of indium in the alloy system drastically alters the slope and the pressure of the plateau observed at higher pressure of the two isotherm plateaux of the NdNi<sub>5</sub>-hydrogen system. The final result is a merge of both plateaux into a single one for the hydrogen desorption isotherms of NdNi<sub>4.8</sub>In<sub>0.2</sub>. However, the isotherms of nonstoichiometric NdNi<sub>4.8</sub> still exhibit two separated pressure plateau regions. The thermodynamic parameters of hydride formation, i.e., the entropy change, the enthalpy and the Gibbs free energy of formation have also been extracted for all alloy-hydrogen systems.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0925-8388</s0></fA01><fA03 i2="1"><s0>J. alloys compd.</s0></fA03><fA05><s2>420</s2></fA05><fA06><s2>1-2</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Interaction of hydrogen with the LaNi<sub>4.9</sub>In<sub>0.1</sub>, LaNi<sub>4.8</sub>In<sub>0.2</sub> and LaNi<sub>4.8</sub> alloys and their Nd analogues</s1></fA08><fA11 i1="01" i2="1"><s1>DRASNER (A.)</s1></fA11><fA11 i1="02" i2="1"><s1>BLAZINA (Z.)</s1></fA11><fA14 i1="01"><s1>Laboratory for Solid State Chemistry, Division of Materials Chemistry, Institute Ruder Boškovic, PO Box 180</s1><s2>10002 Zagreb</s2><s3>HRV</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></fA14><fA20><s1>213-217</s1></fA20><fA21><s1>2006</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>1151</s2><s5>354000139000310370</s5></fA43><fA44><s0>0000</s0><s1>© 2006 INIST-CNRS. All rights reserved.</s1></fA44><fA45><s0>23 ref.</s0></fA45><fA47 i1="01" i2="1"><s0>06-0357000</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Journal of alloys and compounds</s0></fA64><fA66 i1="01"><s0>CHE</s0></fA66><fC01 i1="01" l="ENG"><s0>The single phase nature of the alloys LaNi<sub>4.9</sub>In<sub>0.1</sub>, LaNi<sub>4.8</sub>In<sub>0.2</sub>, NdNi<sub>4.9</sub>In<sub>0.1</sub>, NdNi<sub>4.8</sub>In<sub>0.2</sub> of the systems LaNi<sub>5-x</sub>In<sub>x</sub> and NdNi<sub>5-x</sub>In<sub>x</sub> was confirmed by means of X-ray powder diffractometry. Nonstoichiometric alloys LaNi<sub>4.8</sub> and NdNi<sub>4.8</sub> were prepared and were also found to be good single phase materials. All these alloys crystallize with the same hexagonal structure of the CaCu<sub>5</sub> type (space group P6/mmm) as do their prototypes LaNi<sub>5</sub> and NdNi<sub>5</sub>. In order to determine the interaction with hydrogen the alloys were exposed to hydrogen gas and the pressure composition desorption isotherms were measured. It was found that all alloys react readily and reversibly absorb large amounts of up to 6.54 hydrogen atoms per alloy formula unit. Generally the equilibrium pressure and the hydrogen capacity decrease with the decreasing nickel content. Presence of indium in the alloy acts in favour of these trends. Furthermore, the increasing content of indium in the alloy system drastically alters the slope and the pressure of the plateau observed at higher pressure of the two isotherm plateaux of the NdNi<sub>5</sub>-hydrogen system. The final result is a merge of both plateaux into a single one for the hydrogen desorption isotherms of NdNi<sub>4.8</sub>In<sub>0.2</sub>. However, the isotherms of nonstoichiometric NdNi<sub>4.8</sub> still exhibit two separated pressure plateau regions. The thermodynamic parameters of hydride formation, i.e., the entropy change, the enthalpy and the Gibbs free energy of formation have also been extracted for all alloy-hydrogen systems.</s0></fC01><fC02 i1="01" i2="X"><s0>001D11F</s0></fC02><fC02 i1="02" i2="X"><s0>001D11C06B</s0></fC02><fC02 i1="03" i2="X"><s0>240</s0></fC02><fC03 i1="01" i2="X" l="FRE"><s0>Diffraction RX</s0><s5>02</s5></fC03><fC03 i1="01" i2="X" l="ENG"><s0>X ray diffraction</s0><s5>02</s5></fC03><fC03 i1="01" i2="X" l="GER"><s0>Roentgenbeugung</s0><s5>02</s5></fC03><fC03 i1="01" i2="X" l="SPA"><s0>Difracción RX</s0><s5>02</s5></fC03><fC03 i1="02" i2="X" l="FRE"><s0>Composition non stoechiométrique</s0><s5>03</s5></fC03><fC03 i1="02" i2="X" l="ENG"><s0>Non stoichiometric composition</s0><s5>03</s5></fC03><fC03 i1="02" i2="X" l="GER"><s0>Nichtstoechiometrische Zusammensetzung</s0><s5>03</s5></fC03><fC03 i1="02" i2="X" l="SPA"><s0>Composición no estequiométrica</s0><s5>03</s5></fC03><fC03 i1="03" i2="X" l="FRE"><s0>Propriété thermodynamique</s0><s5>04</s5></fC03><fC03 i1="03" i2="X" l="ENG"><s0>Thermodynamic properties</s0><s5>04</s5></fC03><fC03 i1="03" i2="X" l="GER"><s0>Thermodynamische Eigenschaft</s0><s5>04</s5></fC03><fC03 i1="03" i2="X" l="SPA"><s0>Propiedad termodinámica</s0><s5>04</s5></fC03><fC03 i1="04" i2="X" l="FRE"><s0>Désorption</s0><s5>05</s5></fC03><fC03 i1="04" i2="X" l="ENG"><s0>Desorption</s0><s5>05</s5></fC03><fC03 i1="04" i2="X" l="GER"><s0>Desorption</s0><s5>05</s5></fC03><fC03 i1="04" i2="X" l="SPA"><s0>Desorción</s0><s5>05</s5></fC03><fC03 i1="05" i2="3" l="FRE"><s0>Stockage hydrogène</s0><s5>06</s5></fC03><fC03 i1="05" i2="3" l="ENG"><s0>Hydrogen storage</s0><s5>06</s5></fC03><fC03 i1="06" i2="X" l="FRE"><s0>Réaction gaz solide</s0><s5>11</s5></fC03><fC03 i1="06" i2="X" l="ENG"><s0>Gas solid reaction</s0><s5>11</s5></fC03><fC03 i1="06" i2="X" l="GER"><s0>Gas Festreaktion</s0><s5>11</s5></fC03><fC03 i1="06" i2="X" l="SPA"><s0>Reacción gas sólido</s0><s5>11</s5></fC03><fC03 i1="07" i2="X" l="FRE"><s0>Néodyme alliage</s0><s5>15</s5></fC03><fC03 i1="07" i2="X" l="ENG"><s0>Neodymium alloy</s0><s5>15</s5></fC03><fC03 i1="07" i2="X" l="GER"><s0>Neodymlegierung</s0><s5>15</s5></fC03><fC03 i1="07" i2="X" l="SPA"><s0>Neodimio aleación</s0><s5>15</s5></fC03><fC03 i1="08" i2="X" l="FRE"><s0>Lanthane alliage</s0><s5>16</s5></fC03><fC03 i1="08" i2="X" l="ENG"><s0>Lanthanum alloy</s0><s5>16</s5></fC03><fC03 i1="08" i2="X" l="GER"><s0>Lanthanlegierung</s0><s5>16</s5></fC03><fC03 i1="08" i2="X" l="SPA"><s0>Lantano aleación</s0><s5>16</s5></fC03><fC03 i1="09" i2="X" l="FRE"><s0>Hydrure</s0><s2>NA</s2><s5>20</s5></fC03><fC03 i1="09" i2="X" l="ENG"><s0>Hydrides</s0><s2>NA</s2><s5>20</s5></fC03><fC03 i1="09" i2="X" l="GER"><s0>Hydrid</s0><s2>NA</s2><s5>20</s5></fC03><fC03 i1="09" i2="X" l="SPA"><s0>Hidruro</s0><s2>NA</s2><s5>20</s5></fC03><fC03 i1="10" i2="X" l="FRE"><s0>65</s0><s4>INC</s4><s5>56</s5></fC03><fN21><s1>240</s1></fN21></pA></standard></inist></record>Pour manipuler ce document sous Unix (Dilib)
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