Synthesis of Magnesium Nickel Boride Aggregates via Borohydride Autogenous Pressure

We demonstrate synthesis of the ternary intermetallic MgNi₃B₂ using autogenous pressure from the reaction of NaBH₄ with Mg and Ni metal powder. The decomposition of NaBH₄ to H₂ and B₂H₆ commences at low temperatures in the presence of Mg and/or Ni and promotes formation of Ni-borides and MgNi₃B₂ wit...

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Veröffentlicht in:	Materials 2018-03, Vol.11 (4), p.480
Hauptverfasser:	Shahbazi, Mahboobeh, Cathey, Henrietta E, Mackinnon, Ian D R
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Sprache:	eng
Schlagworte:	Aggregates Borides Chemical synthesis Decomposition reactions Diamagnetism Ferromagnetism Magnetic measurement Metal powders Nickel Temperature
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description	We demonstrate synthesis of the ternary intermetallic MgNi₃B₂ using autogenous pressure from the reaction of NaBH₄ with Mg and Ni metal powder. The decomposition of NaBH₄ to H₂ and B₂H₆ commences at low temperatures in the presence of Mg and/or Ni and promotes formation of Ni-borides and MgNi₃B₂ with the increase in temperature. MgNi₃B₂ aggregates with Ni-boride cores are formed when the reaction temperature is >670 °C and autogenous pressure is >1.7 MPa. Morphologies and microstructures suggest that solid-gas and liquid-gas reactions are dominant mechanisms and that Ni-borides form at a lower temperature than MgNi₃B₂. Magnetic measurements of the core-shell MgNi₃B₂ aggregates are consistent with ferromagnetic behaviour in contrast to stoichiometric MgNi₃B₂ which is diamagnetic at room temperature.
doi_str_mv	10.3390/ma11040480
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The decomposition of NaBH₄ to H₂ and B₂H₆ commences at low temperatures in the presence of Mg and/or Ni and promotes formation of Ni-borides and MgNi₃B₂ with the increase in temperature. MgNi₃B₂ aggregates with Ni-boride cores are formed when the reaction temperature is >670 °C and autogenous pressure is >1.7 MPa. Morphologies and microstructures suggest that solid-gas and liquid-gas reactions are dominant mechanisms and that Ni-borides form at a lower temperature than MgNi₃B₂. Magnetic measurements of the core-shell MgNi₃B₂ aggregates are consistent with ferromagnetic behaviour in contrast to stoichiometric MgNi₃B₂ which is diamagnetic at room temperature.</description><subject>Aggregates</subject><subject>Borides</subject><subject>Chemical synthesis</subject><subject>Decomposition reactions</subject><subject>Diamagnetism</subject><subject>Ferromagnetism</subject><subject>Magnetic measurement</subject><subject>Metal powders</subject><subject>Nickel</subject><subject>Temperature</subject><issn>1996-1944</issn><issn>1996-1944</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNpdkV1LwzAYhYMobkxv_AFS8EaEab6aNjeCDr_AL1CvQ5a-7TrbZibtYP_ezE2d5iYveR9OzuEgdEDwKWMSn9WaEMwxT_EW6hMpxZBIzrc35h7a936Kw2GMpFTuoh6VcYIFln308rJo2gn40kc2jx500YS5q6PH0rxDFV1aV2YQXRSFg0K34KN5qZevdrLIVquutQU0tvPRswPvOwd7aCfXlYf99T1Ab9dXr6Pb4f3Tzd3o4n5oOBbtMBY8j6nmLDOSZToxIqFxYiiAwLmIszFNgCZGgjCxpIIYmWIqM5aGGDxJJRug85XurBvXkBloWqcrNXNlrd1CWV2qv5umnKjCzlUsY8KoCALHawFnPzrwrapLb6CqdAMhkKKYhC-ZTNKAHv1Dp7ZzTYgXKI5lMPQleLKijLPeO8h_zBCslnWp37oCfLhp_wf9Lod9AmAQj2g</recordid><startdate>20180323</startdate><enddate>20180323</enddate><creator>Shahbazi, Mahboobeh</creator><creator>Cathey, Henrietta E</creator><creator>Mackinnon, Ian D R</creator><general>MDPI AG</general><general>MDPI</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>JG9</scope><scope>KB.</scope><scope>PDBOC</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>7X8</scope><scope>5PM</scope><orcidid>https://orcid.org/0000-0002-0732-8987</orcidid></search><sort><creationdate>20180323</creationdate><title>Synthesis of Magnesium Nickel Boride Aggregates via Borohydride Autogenous Pressure</title><author>Shahbazi, Mahboobeh ; 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The decomposition of NaBH₄ to H₂ and B₂H₆ commences at low temperatures in the presence of Mg and/or Ni and promotes formation of Ni-borides and MgNi₃B₂ with the increase in temperature. MgNi₃B₂ aggregates with Ni-boride cores are formed when the reaction temperature is >670 °C and autogenous pressure is >1.7 MPa. Morphologies and microstructures suggest that solid-gas and liquid-gas reactions are dominant mechanisms and that Ni-borides form at a lower temperature than MgNi₃B₂. Magnetic measurements of the core-shell MgNi₃B₂ aggregates are consistent with ferromagnetic behaviour in contrast to stoichiometric MgNi₃B₂ which is diamagnetic at room temperature.</abstract><cop>Switzerland</cop><pub>MDPI AG</pub><pmid>29570609</pmid><doi>10.3390/ma11040480</doi><orcidid>https://orcid.org/0000-0002-0732-8987</orcidid><oa>free_for_read</oa></addata></record>
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subjects	Aggregates Borides Chemical synthesis Decomposition reactions Diamagnetism Ferromagnetism Magnetic measurement Metal powders Nickel Temperature
title	Synthesis of Magnesium Nickel Boride Aggregates via Borohydride Autogenous Pressure
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