Name: bulk and thin film synthesis of compositionally variant entropy-stabilized oxides
Uploaded: 2018-05-29T15:00:00
Description: Watch this Scientific Journal Video about Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides at JoVE.com

Detta arbete var delvis finansierad av National Science Foundation grant nej. DMR-0420785 (XPS). Vi tackar University of Michigan's Michigan Center för materialkarakterisering, (MC)2, för dess hjälp med XPS, och University of Michigan Van Vlack laboratoriet för XRD. Vi vill också tacka Thomas Kratofil för hans hjälp med bulk material förberedelse.

Försiktighet: Nödvändiga personliga skyddsutrustning (PPE) inklusive Stäng-toed skor, full längd byxor, skyddsglasögon, partikelfiltrering mask, labbrock och handskar som oxid pulver utgör en risk för hud kontakt irritation och ögonkontakt irritation. Se alla relevanta säkerhetsdatablad före början för ytterligare krav för personlig skyddsutrustning. Syntesen bör göras med användning av tekniska kontrollåtgärder såsom ett dragskåp.
1. bulk syntes av entropi-stabiliserad oxid...

<ol>
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Vi har beskrivit och visat ett protokoll för syntesen av bulk och hög kvalitet, enda kristallina filmar av (Mg0.25(1-x)CoxNi0.25(1-x)Cu0.25(1-x)Zn0.25(1-x)) O (x = 0,20, 0,27, 0,33) och (Mg0.25(1-x) Co0.25(1-x)Ni0.25(1-x)CuxZn0.25(1-x)) O (x = 0,11, 0,27) entropi-stabiliserad oxider. Vi förväntar oss att dessa syntes tekniker tillämpas på ett brett utbud av entropi-stabiliserad oxid kompositioner som mer up...

Sedan upptäckten av high-entropy metallegeringar i 2004, har high-entropy material lockade stort intresse på grund av egenskaper såsom ökad hårdhet1,2,3, seghet4, 5och korrosion motstånd3,6. High-entropy oxider7,8 och borider9 har nyligen upptäckts, öppna upp en stor lekplats för materiella entusiaster. Oxider, i synnerhet, kan påvisa användbar och dynamiska funktionella egenskaper såsom ferroelectricity10, magnetoelectricity11,12, thermoelectricity13och supraledning14 . Entropi-stabiliserad oxider (ESOs) har nyligen visat sig ha intressanta, sin sammansättning beroende av funktionella egenskaper15,16, trots den betydande störning, att göra denna nya klass av material särskilt spännande.
Entropi-stabiliserad material är kemiskt homogent, flerkomponents (vanligtvis med fem eller fler väljare), enfas material där configurational entropisk bidrag (<img alt="Equation 1" src="/files/ftp_upload/57746/57746eq1.jpg">) till Gibbs fria energi (<img alt="Equation 2" src="/files/ftp_upload/57746/57746eq2.jpg">) är betydande tillräckligt för att driva bildandet av en enda fas fast lösning17. Syntesen av flerkomponents ESOs, där katjoniska configurational disorder observeras över den ering tomten, kräver exakt kontroll över sammansättning, temperatur, insvetstal, släcka rate och släcka temperatur7,16 . Denna metod syftar till att möjliggöra den utövaren förmågan att syntetisera fas ren och kemiskt homogent entropi-stabiliserad oxid keramiska pellets och fas ren, enda kristallina, platta tunna filmer av den önskade stökiometri. Bulkmaterial kan syntetiseras med mer än 90% teoretisk täthet möjliggör studiet av elektroniska, magnetiska och strukturella egenskaper eller användning som källor för tunn film fysiska vapor deposition (PVD) tekniker. Som entropi-stabiliserad kväveoxider anses här har fem katjoner, tunn film PVD tekniker som sysselsätter fem källor, såsom molekylärt stråla epitaxyen (MBE) eller samtidig sputtring, kommer att presenteras med utmaningen att deponera kemiskt homogent tunna filmer på grund till flux drift. Detta protokoll resulterar i kemiskt homogent, singel, kristallin platt (root-mean-square (RMS) ojämnheter i ~0.15 nm) entropi-stabiliserad oxid tunna filmer från en enda material källa, som är visat att inneha nominella kemiska sammansättning. Detta tunnfilmsteknik syntes protokoll kan förbättras genom införande av i situ electron eller optisk karakterisering tekniker för realtidsövervakning av syntesen och raffinerade kvalitetskontroll. Förväntade begränsningar av denna metod härstammar från laser energi drift vilket kan begränsa tjockleken av hög kvalitetsfilmer att bli lägre än 1 μm.
Trots de betydande framsteg i tillväxten och karakterisering av tunn film oxid material10,18,19,20,21, korrelationen mellan stereokemi och elektronstruktur i oxider kan leda till betydande skillnader i det slutliga materialet som härrör från till synes obetydliga metodologiska skillnader. Fältet av flerkomponents entropi-stabiliserad oxider är dessutom snarare begynnande, med endast två aktuella rapporter av tunn film syntes i litteratur7,16. ESOs lämpar sig särskilt väl för denna process, kringgå utmaningar som skulle presenteras av kemisk förångningsdeposition och molekylärt stråla epitaxyen. Här, vi tillhandahåller en detaljerad syntes protokoll av bulk och tunna filmer ESOs (figur 1), för att minimera materialbearbetning svårigheter, oavsiktliga boende variationer, och förbättra accelerationen av upptäckten i fältet.

<table border="0" cellpadding="0" cellspacing="0" width="754">
	<tbody>
		<tr height="20">
			<td height="20" style="height:20px;width:379px;">MAGNESIUM OXIDE 99.95%</td>
			<td style="width:180px;">Fisher</td>
			<td style="width:131px;">AA1468422</td>
			<td style="width:64px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">COBALT(II) OXIDE, 99.995%</td>
			<td>Fisher</td>
			<td>AA4435414</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">NICKEL(II) OXIDE 99.998%</td>
			<td>Fisher</td>
			<td>AA1081914</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">COPPER(II) OXIDE 99.995%</td>
			<td>Fisher</td>
			<td>AA1070014</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">ZINC OXIDE 99.99%</td>
			<td>Fisher</td>
			<td>AA8781230</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">TRICHLROETHLENE SEMICNDTR 9</td>
			<td>Fisher</td>
			<td>AA39744K7</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">ACETONE SEMICNDTR GRD 99.5%</td>
			<td>Fisher</td>
			<td>AA19392K7</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">2-PROPANOL ACS 99.5%</td>
			<td>Fisher</td>
			<td>A416S4</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Mineral oil, pure</td>
			<td>Acros Organics</td>
			<td>AC415080010</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">alumina crucible</td>
			<td>MTI Corporation</td>
			<td>eq-ca-l50w40h20</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">ZIRCONIA (YSZ) GRINDING MEDIA</td>
			<td>Inframat Advanced Materials</td>
			<td>4039GM-S010</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">SiC paper 320/600/800/1200</td>
			<td>South Bay Technology</td>
			<td>SDA08032-25</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">MgO (100) substrate, 5x5x0.5 mm, 1SP</td>
			<td>MTI Corporation</td>
			<td>MGa050505S1</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">OXYGEN COMPRESSED ULTRA HIGH PURITY GRADE, 99.999%</td>
			<td>Cryogenic Gases</td>
			<td>OXYUHP</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">NITROGEN COMPRESSED EXTRA DRY GRADE</td>
			<td>Cryogenic Gases</td>
			<td>NITEX</td>
			<td></td>
		</tr>
	</tbody>
</table>

bulk and thin film synthesis of compositionally variant entropy-stabilized oxides

Här presenterar vi ett förfarande för syntesen av bulk och tunn film multicomponent (Mg0.25(1-x)CoxNi0.25(1-x)Cu0.25(1-x)Zn0.25(1-x)) O (Co variant) och (Mg0.25(1-x)Co0.25(1-x)Ni 0.25(1-x) CuxZn0.25(1-x)) O (Cu variant) entropi-stabiliserad oxider. Fas ren och kemiskt homogent (Mg0.25(1-x)CoxNi0.25(1-x)Cu0.25(1-x)Zn0.25(1-x)) O (x = 0,20, 0,27, 0,33) och (Mg0.25(1-x)Co0.25(1-x)Ni0.25(1-x) CuxZn0.25(1-x)) O (x = 0,11, 0,27) keramiska pellets syntetiseras och används i nedfallet av ultrahög kvalitet, fas ren, enda kristallina tunna filmer av den mål stökiometri. En detaljerad metod för nedfall av släta, kemiskt homogent, entropi-stabiliserad oxid tunna filmer av pulsad laser nedfall på (001)-orienterade MgO substrat beskrivs. Den fas och kristallinitet av bulk och tunn filmmaterial bekräftas med hjälp av röntgendiffraktion. Sammansättning och kemiska homogenitet bekräftas av röntgen fotoelektronen spektroskopi och energy dispersive X-ray spektroskopi. Yta topografin av tunna filmer mäts med scanning sonden mikroskopi. Syntesen av hög kvalitet, enda kristallint, entropi-stabiliserad oxid tunna filmer kan studiet av gränssnitt, storlek, stam och sjukdom effekter på egenskaperna i denna nya klass av mycket störda oxid material.

Röntgendiffraktion (XRD) spektra togs av både den beredda (Mg0.25(1-x)CoxNi0.25(1-x)Cu0.25(1-x)Zn0.25(1-x)) O (x = 0,20, 0,27, 0,33) och (Mg0.25(1-x)Co0.25(1-x)Ni0.25(1-x )CuxZn0.25(1-x)) O (x = 0,11, 0,27) bulk keramik (figur 4a) och deponeras tunna filmer (figur 4b). Dessa data visar att proverna är enfas och kan anv...

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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Syntesen av hög kvalitet bulk och tunn film (Mg0.25(1-x)CoxNi0.25(1-x)Cu0.25(1-x)Zn0.25(1-x)) O och (Mg0.25(1-x)Co0.25(1-x)Ni0.25(1-x)CuxZn0.25(1-x )) O entropi-stabiliserad oxider presenteras.

Bulk och tunn Film syntes av sin sammansättning Variant entropi-stabiliserad oxider

Here, we present a procedure for the synthesis of bulk and thin film multicomponent (Mg0.25(1-x)CoxNi0.25(1-x)Cu0.25(1-x)Zn0.25(1-x))O (Co variant) and ...

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