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

Dette arbejde var delvis finansieret af National Science Foundation grant nr. DMR-0420785 (XPS). Vi takker University of Michigan's Michigan Center for materialer karakterisering, (MC)2, for sin bistand med XPS, og University of Michigan Van Vlack laboratorium for XRD. Vi vil også gerne takke Thomas Kratofil for hans hjælp med bulk materialer forberedelse.

Forsigtig: Bære nødvendige personlige værnemidler (PPE) herunder close-tåede sko, fuld længde bukser, sikkerhedsbriller, partikelfiltrering maske, laboratoriekittel og handsker som oxid pulvere udgør en risiko for hudirritation kontakt og øjenkontakt irritation. Høre alle relevante leverandørbrugsanvisninger før begyndelsen yderligere PPE krav. Sammenfattende bør ske ved hjælp af tekniske foranstaltninger såsom et stinkskab.
1. bulktransport syntese af entropi-stabiliseret oxider</p...

<ol>
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Vi har beskrevet og vist en protokol til syntese af bulk og høj kvalitet, single krystallinsk film af (Mg0.25(1-x)CoxNi0.25(1-x)Cu0.25(1-x)Zn0.25(1-x)) O (x = 0,20, 0,27, 0,33) og (Mg0.25(1-x) Co0.25(1-x)Ni0.25(1-x)CuxZn0.25(1-x)) O (x = 0,11, 0,27) entropi-stabiliseret oxider. Vi forventer, at disse syntese teknikker til at gælde for en bred vifte af entropi-stabiliseret oxid kompositioner som mere er opdaget ...

Siden opdagelsen af høj-entropi metallegeringer i 2004, har høj-entropi materialer tiltrukket betydelig interesse på grund af egenskaber såsom øget hårdhed1,2,3, sejhed4, 5, og korrosion modstand3,6. For nylig er blevet opdaget high-entropi oxider7,8 og borider9 , åbner en stor legeplads for materielle entusiaster. Oxider, især kan påvise nyttige og dynamisk funktionelle egenskaber som ferroelectricity10, magnetoelectricity11,12, thermoelectricity13og superledning14 . Entropi-stabiliseret oxider (ESO) har for nylig vist sig at besidde interessant, kompositorisk-afhængige funktionelle egenskaber15,16, trods den betydelige lidelse, at gøre denne nye klasse af materialer særligt spændende.
Entropi-stabiliserede materialer er kemisk homogen, stand (typisk med fem eller flere bestanddele), enfaset materialer hvor den configurational entropic bidrag (<img alt="Equation 1" src="/files/ftp_upload/57746/57746eq1.jpg">) til Gibbs fri energi (<img alt="Equation 2" src="/files/ftp_upload/57746/57746eq2.jpg">) er signifikant nok til at drive dannelsen af en enkelt fase solid løsning17. Syntesen af stand ESO, hvor kationiske configurational disorder er observeret på tværs af websteder kation kræver præcis kontrol over sammensætning, temperatur, deposition sats, slukke sats, og slukke temperatur7,16 . Denne metode søger at give udøveren evne til at syntetisere fase ren og kemisk homogene entropi-stabiliseret oxid keramiske pellets og fase rene, enkelt krystallinsk, flad tynde film af den ønskede støkiometrisk. Bulk materialer kan syntetiseres med mere end 90% teoretiske tæthed gør det muligt for studiet af de elektroniske, magnetiske og strukturelle egenskaber eller bruge som kilder til tynde film fysiske damp deposition (PVD) teknikker. Som entropi-stabiliseret kvælstofoxider betragtes som her har fem kationer, tynd film PVD teknikker, der anvender fem kilder, såsom molekylære stråle epitaxy (MBE) eller co sputtering, vil blive præsenteret med udfordring efter deponeringen kemisk homogen tynde film grund til flux drift. Denne protokol resulterer i kemisk homogen, enkelt krystallinsk, fast (root-mean-square (RMS) ruhed af ~0.15 nm) entropi-stabiliseret oxid tynde film fra en enkelt kilde, materiale, der er vist sig at besidde den nominelle kemiske sammensætning. Denne tynde film syntese protokol kan forbedres ved inddragelse af i situ electron eller optisk karakterisering teknikker til real-time overvågning af syntesen og raffineret kvalitetskontrol. Forventede begrænsninger af denne metode stammer fra laser energi afdrift, som kan begrænse tykkelsen af høj kvalitetsfilm skal ligge under 1 μm.
Trods de betydelige fremskridt i vækst og karakterisering af tyndfilm oxid materialer10,18,19,20,21, korrelation mellem stereokemi og elektroniske struktur i oxider kan føre til betydelige forskelle i det endelige materiale stammer fra tilsyneladende ubetydelige metodologiske forskelle. Desuden er inden for stand entropi-stabiliseret oxider temmelig spirende, med kun to aktuelle rapporter af tyndfilm syntese i litteratur7,16. ESO egner sig særlig godt til denne proces, omgå udfordringer, som vil blive fremlagt af kemisk dampudfældning og molekylær stråle epitaxy. Her, vi leverer en detaljeret syntese protokol af bulk og tynde film ESO (figur 1), for at minimere materialer forarbejdning vanskeligheder, utilsigtede ejendom variationer, og forbedre acceleration af discovery i feltet.

<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

Vi præsenterer her, en procedure for syntesen af bulk og tynd film flerkomponent (Mg0.25(1-x)CoxNi0.25(1-x)Cu0.25(1-x)Zn0.25(1-x)) O (Co variant) og (Mg0.25(1-x)Co0.25(1-x)Ni 0.25(1-x) CuxZn0.25(1-x)) O (Cu variant) entropi-stabiliseret oxider. Fase ren og kemisk homogen (Mg0.25(1-x)CoxNi0.25(1-x)Cu0.25(1-x)Zn0.25(1-x)) O (x = 0,20, 0,27, 0,33) og (Mg0.25(1-x)Co0.25(1-x)Ni0.25(1-x) CuxZn0.25(1-x)) O (x = 0,11, 0,27) keramiske pellets er syntetiseret og bruges i aflejring af ultra-høj kvalitet, fase rene, enkelt krystallinsk tynde film af target støkiometrisk. En detaljeret metode for deposition af glatte, kemisk homogene, entropi-stabiliseret oxid tynde film af pulserende laser deposition på (001)-orienterede MgO substrater er beskrevet. Fase og crystallinity af bulk og tynd film materialer er bekræftet ved hjælp af røntgen diffraktion. Sammensætning og kemiske homogenitet bekræftes af X-ray photoelectron spektroskopi og energy dispersive X-ray spektroskopi. Den overflade topografi af tynde film er målt med scanning probe mikroskopi. Syntese af høj kvalitet, enkelt krystallinsk, entropi-stabiliseret oxid tynde film giver mulighed for undersøgelse af interface, størrelse, stamme og lidelse effekter på egenskaberne i denne nye klasse af stærkt uordnede oxid materialer.

Røntgen diffraktion (XRD) spektre taget af både den forberedte (Mg0.25(1-x)CoxNi0.25(1-x)Cu0.25(1-x)Zn0.25(1-x)) O (x = 0,20, 0,27, 0,33) og (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) og deponeret tynde film (figur 4b). Disse data viser, at prøverne er enkelt fase og k...

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

Syntesen af høj kvalitet bulk og tynd film (Mg0.25(1-x)CoxNi0.25(1-x)Cu0.25(1-x)Zn0.25(1-x)) O og (Mg0.25(1-x)Co0.25(1-x)Ni0.25(1-x)CuxZn0.25(1-x )) O entropi-stabiliseret oxider er præsenteret.

Bulk og tynd Film syntese af kompositorisk Variant entropi-stabiliseret 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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