Магнитокалорический эффект в окрестности фазовых переходов первого рода в соединениях редкоземельных и переходных металлов (1103600), страница 2
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∆S = 14 · 104 DFGFEH] G ^Fa M nF e(P As ) Z ∆S = 13.2 · 104 DFGFEH] G ^Fa0.450.55FDHEG=^FasM nF e(P0.47 As0.53 ) ∆S = 13.4 · 104 GF]M n1.1 F e0.9 (P0.47 As0.53 )365iGCHcE:[^:8;;gYhà=I8I[F:f^CHc?+;=kocH=%^;CZ£9B+Cr7cE:fF=9:<;=:ÅIfCM^:8GE?+;="ao®0·UiG=;:<=58>':<;;CE>IfCHCEB+;CEW:<;==2è^¶ RT°NiG=cHCM^=BD27%cH:<F=9:8;=]oB+:M>'i:<G?+B+7%GgoT6]G=s tB+C:NcHG:M>aZ>@?+D"If=>@?+FnH;?+acE:fF=9=;?¢>@?+A8;=B+CED%?OFCHG=9:8IfD%CHA8CJ8LNL6:8DBp?=«=G=;?i=D"?ÀiG?HDB+=9:8IfD=K;:2>':8;"a]BHIba_s 0cE:fF=9:<;=:2IfCM^:8GE?+;="aÁè¶Z cI<cHCE]dCH9:<G:f^nZ¬MÂiG=cEC8^=BD¿7">':<;nEW:<;=] B+:M>'i:<G?+B+7%Gg T6]0G=Zq;Cl>@?+D%I<=>@?OFnH;g~:5<;?M9:8;="a>@?+A8;=B+CED%?OFCHG=9:8IfD%CHA8CqJ8LNL6:8DBp?eIfBp?H;CHcHaBHIbaj;:8I<DCHFnHD%Cz\HC+FnHW:Es Ï0\If7^:<;=:CH\E;?+G7:8;;gYh58?+D%CH;C>':<G;CEIfBH:<k¢\EgYFC£iGCEcH:[^:<;C£c£G?H>'D"?Oh>@?+A8;=B+CIfB+G=D¡=CE;;CHk>'C8^:fF=LN?+5<CEcHgYhi:<G:<hEC8^CHc¢_=;?OuvûCM^\E:fF?sË67%B+:M>riGa>'gYhÀ=5M>':<G:8;=k\EgYFC27EIfBO?+;CEc+F:8;CZ9B+Cc2=I<I[F:[^CEcE?+;;gYhCE\HG?H5<¡?Oh>@?+D"If=>@?+FnH;gYho58;?p9:<;=k|RTWV^CEI<B+=Af?+:<BycyCHDG:MIfB+;CEIfBMa"hoBH:8>'i:8G?+B+7%GgªT6]0G=sT6G=cEg~:UiCHF:<cEgYh58?HcH=I<=>'CEI<B+:<kyRTWV0Z_=5M>':<G:8;;g~:iG=yB+:8>'i:8G?+BH7G?Ohr>':<;nHW=hZ";?HI<g~`?H]BHIbaZ%;CcH:<F=9=;grRUTWVKcJ<B+CEk×CH\HF?HI<B+=B+:8>'i:8G?+BH7G2>':8;nH:Hs'û':<58D=kTCGCEI<BKcH:<F=9=;gRUTWV0Z~=58>':8G:<;;CHA8CKiG=QB+:M>'i:<G?HB+7%G?OhycEg~W: T Z6;?M9=;?+:8BHIbaycCiC+Fa"hiG:8cHg~?+]`="hDG=BH=9:8I<DCE:6iC+F:NLN?+5<CEcHC+A8CWi:<G:fhECM^?s@Ë6CHJ<BHCE>'7\HgYF2I^:<F?+;cHg~cEC8^Z9BHCdc{=587%9:<;;gYhCH\HG?+5<¡?OhjcHgI<CHD=:m58;?M9:<;="a>@?+A<;=B+CHD"?OFCEG=9:MIfD%CHA<CJ8LNL6:8DBp?×CH\ CaIf;"a]0BHIaÀcHg_^:<F:<;=:8>ÈB+:8i"F?«iG=LN?+58CHcHgYhi:8G:fhECM^?Ohi:<GcHCHA8C×GC8^Ç?ZcHg~58cE?+;;gYh¢^:<kIfB+cE=:8>K>@?+A8;=B+;CEA<C¢iCHFast >[ÂiG:f^IfBO?+cHF:<;g J<D"Ifi:8G=>':<;Bp?OFnH;CªiC+F79:<;;g~:c;?HIfBHCMa`:<kG?H\HCHBH:B+:8>'i:<G?HB+7%G;g~:¥= iCHF:<cEg~:5M?+cE=If=>'CIfB+= ;?E>@?+A<;=9:<;;CEI<B+=ZBH:8>'i:8G?+B+7%G;g~:58?HcH=I<=>'CEI<B+=i?+G?E>':<B+GCEcDG=I<Bp?OFF=9:MIfDCEk¥IfB+G7%DBH7Gg iC+F=DG=I<Bp?+FF=9:MIfD=hCH\EG?+58¡CHc LaF e Si Z LaF e Co Si =cE:fF=9=;g RTWV0ZcHg~9=I[F:8;;g~:11.71.311.20.71.1iCÑJ8B+=> ^?H;;g>Ys ?+D":iG:[^ÇIfBp?Hc+F:8;g G:85<7MFnOBp?HB+g iGa>'gYh=5M>':<G:8;=kB+:8>'i:<G?HB+7%G;gYh«=«iCHF:<cEgYh5M?+cE=If=>'CIfB+:8k«RUTWV0s:8>'i:8G?+B+7%G;g~:45M?+cH=If=>'CIfB+=§;?H>@?HA<;=9:<;;CIfB+=§\HgYF=Ñ=58>':<G:<;g ciC+Fa"h¬8ÃE`à ,ÂHÃHÃÅV0s_t{CE\HCH=hÁCH\HG?+5<¡?OhÁi:<G:<hEC8^r=5ÀL6:<GGCE>@?+A8;=B+;CHA<Cci?HG?H>@?HA<;=B+;CH:IfCIfB+Cpa;=:EZ¦cEg~5<cE?H;;CH:Ø;?HA<G:8cE?H;=:8>YZ¤I<CHiGCHcHCp^?+:<BHIba G:85<D=> =58>':8;:<;=:8>;?H>@?HA<;=9:<;;CEIfBH=ocÈ7%58DC>{^=?+i?+5<CE;:B+:8>'i:8G?+BH7Gs:8>'i:<G?HB+7%G;g~kmA8=IfBH:<G:85<=I;?H>@?HA<;=9:<;;CEIfBH= LaF e Co Si ZyC8^;?+D%CZÈ;:jiG:8cHg~?+FCM^;CHA8CA<G?O^7EI<?s11.20.71.1CE9D%? 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BH:8>'i:8G?+B+7%G;CHkiGCE=5<cEC8^;CHke;?H>@?HA<;=9:<;;CEIfBH=Z«CED%?H58?OF?HIfnoG?HcH;CEk¬8ÊEÊ}T^Fa LaF e Si =11.71.3+ OìÈT^Fa sWÌG%78A"=oh@>+?<A;=+B;YgohiG8:HcGH?W`8:;=okc^=+?i+?5<CE;:LaF e11.2 Co0.7 Si1.1B+:8>'i:<G?HB+7%G2CHB T ^C¢ìs ÂTmCH\H;?+G7:<;C;:N\HgYFCsC:8>'i:8G?+B+7%G;g~: 5M?+cH=If=>'CIfB+= i?+G?E>':<B+GCEc DG=I<Bp?+FF=9:MIfD%CHk a9:8kD=CHiG:[^:<Fa"F=I<njiG=iC>'CH`=G:<;B+A<:8;CHA8G?HL6=9:8IfD%CHA8C{=I8I[F:f^CHc?+;=aiCHGCEWD%CHcHgYh¬8É ba :8>'i:8G?+B+7%G;g~:58?HcH=I<=>'CEI<B+=RTWV0Z=5M>':<G:8;;g~:cCEDG:MIfB+;CIfBMa"h{LN?H5<CHcHgYhei:8G:fhECM^CHc|iG=j7%cH:<F=9:8;==j>@?+A8;=B+;CHA<CiC+FaqCEBQÃy^Cz¬8ìàDV ^Fa LaF e Si =zCHBoÃr^Ce¬H¬DV ^Fa11.71.3sLaF e Co Si?11.20.71.1CH\EG?+58¡CHcsCE9D=Z"cDCHBHCHGgYh;?H\+F]_^?H:<BHIba>@?+D%I<=>'7">B+:M>'i:<G?HB+7%G;CEkiGCE=5<cECM^;CHki?+G?H>':<BHG?àa9:8kD=Z×G?HI<iC+FCM:8;gªiG=¬8ÊEQT^Fa LaF e Si ={+ +ÉàT^Fa11.71.3=<IHCEcip?^+?0],BeIfIECHC+BEc<:HB<I+BHc%70]W`='> =+BM:'>i<:G?HB+7%G?H>'=4T6]0G=sLaF e11.2 Co0.7 Si1.1Ë6:<G:<hEC8^àcÁi?+G?E>@?+A8;=B+;CE:ÀI<CEI<B+Cpa;=:ÀiG=cEC8^=BÅDyG:85<DC>'77">':8;nH:<;=]CH+\ C:8>@?JfF:M>':<;BO?+G;CHkQa9:<kD=ZWIfF:[^CHcE?HB+:fFnH;CZ6cÈ7%iCHGa%^CH9:8;;C>dIfCIfB+Cpa;==QcCE\HG?H5<¡?Oh;?+\HF]_^?+:8BHIa2IfiCE;Bp?H;;?+a×CH+\ C:8>';?Oa×>@?HA<;=B+CEI<B+G=D¡="asË6CHF:<cEg~:,58?HcH=I<=>'CEI<B+=l;?E>@?+A8;=9:8;;CEI<B+=ZmiC+F7%9:8;;g~:;=":B+:M>'i:<G?HB+7%GgT6]G=Z=>':<]0BÑcH="^Z,h%?+G?HDB+:<G;g~k^FaxL6:8GGCE>@?HA<;:8B+=D%CHcs Ï^;?+DCÑcHg~W:B+:8>'i:<G?HB+7%Gg T6]G=àiCEcH:f^:<;=:;?E>@?+A8;=9:8;;CEI<B+=àcJ8B+="hàCH\EG?+58¡?OhrIf7%`W:MIfB+cE:<;;C¬<ìG ?+5<F=9?H:<BHIbas t LaF e Si >@?+A<;=B+;CE:4iC+F:cHg~5<g~c?+:<B>':<BO?H>@?+A8;=B+;g~k11.71.3i:<G:fhECM^m=5Ái?+G?H>@?+A8;=B+;CHA<CÈcyL6:<GGCE>@?+A8;=B+;CH:ÅI<CEI<B+CMa;=:HZI<CHiGCEcHCp^Ç?+]`W=kIbaiC+F:<cHg>A8=IfB+:8G:<58=IfC>Ys ïGCEI<B+CE>ªB+:8>'i:8G?+BH7GgÑDG=B+=9:MIfDCE:oiC+F:oi:<G:<hECM^?F=;:8k;C¿7%cH:<F=9=cE?+:8BHIbaIfC¿I<DCEGCEI<B+nH] ìsæ¬DcV R+T¢sàt LaF e Co Si ;:11.20.71.1;?+\HF]_^?+:8BHIai:<G:<A<=\HCHc};?}DG=cHgYheiC+F:8cHCEkz5M?+cE=If=>'CIfB+=;?H>@?HA<;=9:<;;CEIfBH=Z2?Bp?HD":NCHBHI<7BEIfB+cE7H:<B¢iC+F:<cHCEk×A<=I<B+:<G:<5<=I+sR?HA<;=B+CHD"?OFCEG=9:MIfD=keJ8LNL6:<DBQcà^=?+i?H5<CE;:BH:8>'i:8G?+B+7%G¬<ìdà ,qÉHÉHÃoT¿\HgYFG?HI8If9=Bp?+;Ñ;?CEI<;CHcE:=58>':8G:<;;gYhiC+F:8cHgYh58?HcH=I<=>'CEI<B+:<k¿;?H>@?+A8;=9:8;;CIfB+=sT6GCE>':yB+CEA<CZ2cH:<F=9=;?|IfD%?p9D"?}J8;B+GCEi==ZcHCE5<;=D"?+]0`W:<A8C}cI[F:f^IfB+cE=:àLN?+58CHcHCHA<Ci:<G:fhECM^?{i:<GcHCHA8C{GC8^?Z\HgYF?{CH¡:8;:<;?{;?dCEI<;CHcE:|IfCECHB+;CHW:8;="aTF?+ki:<GCE;?OuTF?p758=7EI<?s ßN?+=\EC+FnHW=:5<;?M9:8;="a¿=5M>':<;:8;="aÑJ<;BHGCHi==ÑiG=ÑcHCE5<G?EIfBp?H;==>@?+A8;=B+;CEA<CiC+Fa2CEBÃ^C×Â+âDVyI<CEIfBO?+cE="F= ∆S = 25 · 104 e GFEf] G ^Fa LaF e Si11.71.3= ∆S = 12.5 · 104 e GF]EHG ^Fa LaF e Co Si sÔïGCEI<B+CE>;?+iGa":<;;CEIfBH=11.20.71.1>@?+A8;=B+;CEA<CàiC+FamCH\HF?HI<B+nr\EC+FnEW="ho58;?M9:<;=kqRTWV ;?yDG=cECHkmBH:8>'i:8G?+B+7%G;CHk58?HcH=I<=>'CEI<B+=>@?HA<;=B+CHD"?OFCEG=9:MIfDCEA<CJ8LNL6:8DBp?^FaIfCH:f^=;:8;="a LaF e Si11.71.3G?HI<W=Ga:<BHIbacÅIfB+CEGCH;7Á\EC+F:8:cHgI<CHD="hKB+:8>'i:<G?HB+7%Gs}t{BHC:cEG:8>aZ~cE:fF=9=;?>@?+D"If=>'7">@?RTWVoG?HIfBH:<B2;:<5<;?M9=B+:fFnE;CZ9B+C2h?HG?+DB+:<G;C×^FaI<=IfB+:M>YZcDCEB+CHGgYh>@?+A8;=B+;CE:qiCHF:qcHg~5<g~c?+:<BdLN?H5<CHcHg~ki:<G:<hEC8^ i:<GcHCHA8C{GCM^?s ûCIfBj5<;?p9:<;=k>@?+A8;=B+CED%?OFCHG=9:8IfD%CHA8CdJ8LNL6:8DBp?jc,I<CH:f^=;:8;== LaF e Co Si iGCH=IbhEC8^=B11.20.71.1If=>@>':8B+G=9;CCEB+;CIf=B+:<FnH;CB+:M>'i:<G?+B+7%GgÁT6]G=ZOiG=9:8>cE:fF=9=;?0>@?+D"If=>@?+FnH;CHA<CRTWV=5M>':<;"a:8BHIba}cO^cECH:Es?+D%?+a}58?+cE=If=>'CEIfBHn=5M>':<;:8;="a}J8;B+GCEi==}CE\HG?H5<¡?CEBcH:<F=9=;g iG="FCp:<;;CHA<C>@?+A<;=B+;CEA<CliC+Fa¿h?+G?+DB+:8G;?4^Fa§>@?+B+:8G=?+FCHcZzcDCEB+CHGgYh×;?+\HF]_^?+:8BHIa2>@?+A8;=B+;g~kLN?+5<CEcHg~ki:8G:fhECM^cHB+CEGCHA8CGC8^Ç?s:8>'i:8G?+B+7%G;g~: 58?HcH=I<=>'CEI<B+= RTWV0Z;?H\+F]_^?HcHW=:8Iba iG= 7%cH:fF=9:<;==>@?+A8;=B+;CEA<CdiC+FaCHBdÃe^C¬<ì{DV^Fa LaF e Si =CHBdÃe^C¬H¬mDV^Fa11.71.3jZiG[:^<IpB+?HcF<:;g;?G=HIàsÉs:8>'i:8G?+BH7G;g~kA8=IfBH:<G:85<=ILaF e11.2 Co0.7 Si1.1LN?+58CHcHCHA<C6i:<G:<hECM^?6c LaF e Si IfCIfBO?+c+Fa:<B£ÂNT¢ZH9B+CIfCECHB+cE:<BHI<B+cH7H:8B6A<=I<B+:<G:<5<=If711.71.3B+:8>'i:<G?HB+7%G;CHky5M?+cE=If=>'CIfB+=r;?E>@?+A8;=9:8;;CEI<B+=sT6G=cHg~:>@?+A<;=B+CHD"?OFCEG=9:MIfD%CHA<CJ8LNL6:8DBp?ZEiCHF7%9:<;;g~:iG=;?+A8G:<c?+;===CphF?O^:<;==CH\EG?+58¡? LaF e Co Si Z11.2¬Æ0.71.1fI CEcHi?O^?+]B¢ciG:f^:fF?Oh«iCHA8G:<;CEI<B+=2=58>':8G:<;=kPS;?¢G=I+sÉiG=cE:[^:8;gàG:85<7MFnOBp?HB+g=58>':8G:<;=k2iG=2;?HA<G:8cE?+;==X[s ;?OF=5«DG=cHgYhiC+F:8cHCHkÅ58?HcH=I<=>'CEI<B+=KRTWVqcIfcE=%^:<BH:fFnIfB+cE7H:<BLaF e11.7 Si1.3CB+CE>YZY9B+C>@?+A8;=B+CED%?+FCHG=9:8I<D=kKJ8LNL6:8DBcCH\HF?HI<B+=Ái?HG?+iGCH¡:MI<I8?U58;?M9=B+:fFnH;C>':<;nEW:=5M>':<;:8;="azB+:M>'i:<G?+B+7%GgNZ×iGCH=IhECM^a`W:8A<Cà5M?QI<9:<BocHg_^:<F:<;=azIfDGg~B+CHkB+:<iFCHB+g i:<G:fhECM^?s ßN?lA<G?HL6=D"?OhwZiCHF7%9:<;;gYhÑiG=BH:8>'i:8G?+B+7%G?+h§cHg~W:Zà\HgIfBHGg~kªGCEI<BRTWVx;?p9=;?+:<BEIaªciCHFa"hwZyiG:8cHg~?H]`="hDG=B+=9:MIfD%CH:TCiC+F:yLN?+58CHcHCHA<Coi:8G:fhC8^?sï F:f^CHc?+B+:<FnH;CZc LaF e Si cHgI<CHD=:r5<;?M9:8;="a11.71.3>@?+A8;=B+CED%?OFCHG=9:8IfD%CHA8CJ8LNL6:<DBp?CH+\ CwaIf;a]BHIbaocHg_^:<F:<;=:8>,B+:<i"F?ÈiG=mLN?H5<CEcHCH>i:<G:fhECM^:ei:<GcECHA<CGCM^?ZcHg~5<c?+;;CE>^:8kIfBHcH=:M>§>@?+A8;=B+;CHA<CiCHFas Ë6C+F:<cHg~:58?HcH=I<=>'CEI<B+=>@?HA<;=B+CHD"?OFCEG=9:MIfDCEA<CeJ8LNL6:<DBp?zc LaF e Co Si Z;?+iGCHB+=cZ11.20.71.1F=;:8k;CÈG?HIfBH7BrI7%cH:fF=9:<;=:8>j;?+iGEa":<;;CEI<B+=}>@?+A8;=B+;CHA<CÈiC+FaZ£;:^CIfB+=Af?Oa;?HI<g~`W:8;="aslïGCEIfBHCE>,B+:M>'i:<G?HB+7%Gg4;:Á;?H\+F]_^?+:8BHIba}I<>':8`W:8;="a}DG=B+=9:8IfD%CHA8CiC+FaZ£;CÈ7">':8;nH?+:<BEIao;?+D"FCH;oiC+F:<cHgYhàDG=cHgYhoRTWV0s6V B+CyIfcE=%^:<BH:fFnIfB+cE7H:<BCB+CE>YZw9B+C×J8;B+GCEi="aUCE\HG?H5<¡?iF?+cE;C×>':<;"a:8BHIbaÀI=58>':8;:<;=:8>ÈiC+FaU=UB+:M>'i:<G?+B+7%GgNsß6:2;?+\HF]_^?+:8BHIaIfD"?M9DCHcJ8;B+GCEi==Z~IfcHa58?H;;gYhÅI2cHg_^:fF:8;=:8>|I<DGg~B+CEkB+:<i"FCHB+gi:<G:fhECM^?s?HD=>mCH\HG?+5<CE>QcE;:<;:<:«>@?HA<;=BH;CH:«iCHF:HZ©iC+uvcH=%^=>'CE>'7EZ@;:«cEg~5<g~cE?H:<B>':<BO?H>@?+A8;=B+;CHA<Ci:<G:<hEC8^Ç?cIfCE:[^=;:<;== LaF e Co Si s11.20.71.1t >bÉØiG:[^I<Bp?+cHF:<;g G:<5<7pFnpBO?+B+g =I<I[F:[^CEcE?+;="a >@?HA<;=B+;gYh 7%iG7A8="h =B+:<iFCHcEgYh IfcHCEkIfBHcxIfCH:f^=;:8;="a Gd (Si Ge ) st hC8^:ÑG?H\HCHBHg \EgYF=51.952.05cHg~iCHF;:8;g 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C:M>';g~kh?+G?HDB+:8GlPSiGCM^C+FnH;?+a>@?+A8;=B+CIfB+G=D¡="aiG=\+F=5<=BH:fFnE;CG?+cE;?ÈiCEi:<G:<9;CEkX[sßN?H\+F]_^?H:<BHIba}Bp?+D:KiC+F:8cHCEk}A<=I<B+:<G:85<=IÁiCHGEa%^D%?àÂ+ÃrDV0sÏ0\H;?HG7:<;;g~:CEIfCE\H:<;;CEIfB+=À7D"?+58g~cE?+]0B;?«I<7`:8I<B+cHCEcE?+;=:>@?+A8;=B+CIfB+G7%DBH7G;CHA8CLN?+58CHcHCHA<Ci:<G:<hEC8^Ç?i:<GcECHA<CÅGC8^Ç?iG=àj iÂHÄEÂT¢Z_iGCE=IbhEC8^a`:<A8CiC8^r^:8kIfB+cE=:8>>@?+A8;=B+;CEA<C¢iCHFasÏI<CH\H:8;;CEIfBHnH] =58>':8G:<;=k cH:fF=9=;g >@?HA<;=BHCHD"?OFCEG=9:MIfDCEA<C JMLNL6:<DBO?ZIfCEiGCHcECM^?+]0`W:<A8C >@?+A8;=B+CIfB+G7DB+7%G;g~k LN?+58CHcHg~k i:<G:fhECM^Z CED%?H58?OF?HIfn58?HcH=I<=>'CEI<B+nàiCHF7%9?+:M>'gYhmG:<587MFnOBp?HB+CHcQCHBo>':<B+CM^=D=eiGCEcH:[^:<;="aqJ<D"Ifi:8G=>':8;Bp?sÌ£FaI<G?+cE;:<;="aZ×5<;?M9:8;="a{RTWV\EgYF=eG?HI<I<9=BO?+;gIÈ=IfiC+FnE5<CHcE?+;=:8>^?+;;gYhiC}B+:8i"FCH:M>'DCIfB+==e=58>':<G:<;g;:<iCIfG:f^IfBHcH:<;;Cà^cE7">azG?+5fF=9;g>'={>':<B+CM^?E>'=s¬U -k :8>'i:<G?HB+7%G;g~:Å58?HcH=I<=>'CEI<B+=oRTWV Gd (Si Ge ) c51.952.05iC+F:¬<ì~DÇViC+F7%9:8;;g~:©c~G:<5<7pFnpBO?+B+:©G?EIf9:8Bp?~=NiGa>'gYh6=58>':8G:<;=ks?ti:8GcHCEkI<:<G==J8D%I<i:<G=>':<;B+CEc|CH\EG?+58:<¡If;?M9?+F?o;?+A<G:<cE?+FIba|^C|ÉÂ+Ã}T¦PíËNR2uIfCIfB+Cpa;=:pXÅ=d5M?+B+:M>4i"F?+cH;C|CMh%F?+^?OFIbae^9C OÊqTIàL6=D"I<?+¡=:<kdB+:M>'i:<G?HB+7%Gg9:<G:<5|D"?O^g~:zÂ{T¢s2tÑ7EIfBO?+;CHcH=cHW:8>@IbaI<CEIfBHCMa;==iGCH=58cHCM^="FCIfn=5M>':<G:8;=:RTWV0st_CzcHB+CEGCHk,I<:<G==,J8D%I<i:<G=>':<;B+CEceCH\EG?+58:<¡d;?HA<G:8cE?OFIa^CÉEÂHÃqTiCEIfF:D%?+^CHA<CcHD"F]9:8;="ar>@?+A<;=B+;CEA<CiCHFa}Pö=58>':<G:<;="arCH9:8G:[^;CHA<C58;?p9:<;="aÈRTWVYX[sË6C+F7%9:8;;g~:eG:85<7MFnpBO?+B+g¨iG:[^ÇIfBp?Hc+F:8;gx;?,G=I+sUìs T6G=cHg~:eBH:8>'i:8G?+B+7%G;CHk58?HcH=I<=>'CEI<B+=eRUTWVP ∆H = 14 DVYX=>':8]B}acH;CocHg~G?O:8;;g~k>@?+D%I<=>'7"> iG=B+:8>'i:<G?HB+7%G:HZjiG:8cHg~?+]`:<kÂHÄEÂlT¢ZrA^:4iCM^§^:<kI<B+cH=:M>>@?HA<;=BH;CHA8CiC+FaiGCE=IhECM^=Bi:<G:<hEC8^=5|ËNR lc WRuvI<CEIfBHCMa;=:Hs ßN?+=\EC+FnHW:8:Q58;?M9:<;=:mRUTWV0Z¬8Êi C+F79:<;;CE:2ci:8GcHCEkKI<:<G==J8D%I<i:<G=>':<;B+CEcÈP ∆T ' 2 K XfZ_;:MIfD%C+FnEDC>':8;nH:max9:8>cHCÅcEB+CHGCHkmP ∆T ' 3 K Xfs{V B+CIfcHa58?+;CÅIUB+:M>YZ09B+CÁiG=r=5M>':<G:8;="a"hÈ\E:<5maxCHB+CEA<G:8cE?zPöi:<Gc?Oae>':<B+CM^=D"?EX=5fuv58?QiC+F:<cHCEA<CQA<=I<B+:<G:85<=I8?QCE\HG?H5<:<¡q;?+hEC8^="FIbaqc^cH7hLN?+58;CE>KIfCEI<B+Cpa;==s iCEI<DC+FnHD7×B+:8i"FCZcEg_^:fFa]0`W:8:8Iba2ciGCH¡:MI<I<:WLN?+58CHcHCHA<Ci:<G:fhECM^?Z^?H:<BmcHD"F?O^dcmCE\H`W:8:È=5M>':<;:8;=:yBH:8>'i:8G?+B+7%GgCH\HG?+5<¡?Z×;?+=\HC+FnHW:<:5<;?p9:8;=:}RTWV0ZiCHF7%9:<;;CH:oczi:<GcECHk,I<:<G==,J<D"Ifi:8G=>':<;B+CHc{>':<;nEW:HZÀ9:M>ªcECcHB+CEGCHksË6GCE¡:8I8IfgNZ¿IfCEiGCEcHCM^?H]`W=:¥>@?+A<;=B+CEI<B+G7%DB+7%G;g~k LN?H5<CEc+g~k i:8G:fhECM^ cIfCE:[^=;:<;="a"h Gd (Si Ge ) Z_\HgYF=KiGCE?+;?OF=58=GCEcE?+;g;?CEI<;CHcE:F=B+:<G?+B+7%G;gYh5x1−x^?+;;gYhC DG=IfBO?OFF=9:8I<D="hlIfB+G7DB+7%G?OhcEIf:<hB+G:fhlLN?+5EZà;?+\HF]_^?+]0`W="hIbaªcIf:M>':<kI<B+cH:I<CEI<Bp?+cECHc Gd (Si Ge ) Z£iG=QG?+5fF=9;gYhàDCH;¡:<;BHG?+¡=a"hyDG:8>';="aoc5x1−xCHBHI<7%BHIfB+cE=:£>@?+A8;=B+;CEA<C¢iCHFasÌ£FaxCH+\ CwaIf;:8;=:cH5M?+=>'CIfc+a58=¥>@?+A8;=B+;gYhx=¨IfB+G7DB+7%G;gYh¥iG:<cEG?+`:<;=k\HgYF=x=IfiCHFnH58CHcE?+;g F=B+:8G?+BH7G;g~:ª^?H;;g~:EZIfCHAúF?EIf;C¿DCEB+CHGg>YZ=5M>':<;:8;=:DCE;¡:<;B+G?+¡==IfcHCE\HC8^;gYh58?HGEa%^CEcZQcECH5<;=D%?H]`W:8:,iG=G?H5<Gg~cE:,D%CHc?OF:8;B+;gYhIfcHa5<:<kZq=ÑIfCEiGCEcHCM^?H]`W:8:IfBHG7%DB+7%G;g~kÑi:<G:<hEC8^§CHB+;CIf=BH:fFnE;CH:I8>':<`:<;=:=CH;CHcA[?O^C+F=;="a>'Cp:<BUiG=cHCM^=B+nUD"?+DD=5M>':<;:8;=]d5<;?+D"?Z'Bp?+DÅ=D5M?H>':<BH;CE>'7CEIfF?+\HF:<;=]àcH:<F=9=;gyCH\>':<;;gYhcE58?H=>'CM^:<kI<B+cH=kstÅ)Õ*+n! mÀù©-(ÝÝiG=cH:f^:<;gÁG:85<7MFnOBO?+B+gÁG?EIf9:8Bp?cH:<F=9=;gÅG?+5fF=9;gYhcHD"F?O^CHccàRUTWV0Z6cHCH58;=D"?+]`=kmcEIfF:[^ÇIfB+cE=:ÁcEg_^:fF:8;="aqIfDGg~BHCHk|B+:8i"FCEB+giG=qLN?H5<CHcHgYhi:<G:fhECM^?OhNi:8GcHCEA<C0GC8^Ç?st g~9=I[F:8;="aiGCEcHCM^="F=IfncG?E>'D%?Oh£B+:8G>'CM^=;?E>'=9:8I<DCEA<C>':<B+CM^?ZNIfCEAbF?HIf;CKDCHBHCHGC>'7HZ6=5M>':<;:8;=:J8;B+GCEi==Q=QB+:8>'i:<G?HB+7%GgiG=oLN?H5<CEcHCH>i:<G:fhECM^:6i:<GcECHA8CGC8^?G?HcH;gNZI<CHCHBHcH:<BEIfB+cE:<;;Cä∆Str = −∆TtrT=−C∂∆Eex∂∆Eme∂∆Ea∂∆I,++− Hcr∂T∂T∂T∂T∂∆Eex∂∆Eme∂∆Ea∂∆I.++− Hcr∂T∂T∂T∂Tû'?EIf9:8B>'CM;CiGCHcE:8IfBH=Zd=IfiC+FnE5<7+a§J<D"Ifi:8G=>':8;Bp?+FnH;g~:cE:fF=9=;gs∆I, ∆E , ∆Emea¬8PöìXPÆ XHcr (T )Z po û@?HIf9:<B+;g~:¥B+:8>'i:<G?HB+7%G;g~:¥58?+cE=If=>'CEIfBH= =58>':8;:<;=a>@?HA<;=B+;CHk«9?HIfBH=«J<;B+GCHi==2=«G?+5<F=9;gYhJ8;:<GA<:<BH=9:8I<D="h×cHDF?p^CEcc¢CE\+F?EIfB+=2>@?+A8;=B+;CEA<CLN?H5<CHcHCHA<Ci:<G:<hEC8^?c Gd (Si Ge ) s?51.952.05Nß ?mG=I+s Æ iG:[^ÇIfBp?Hc+F:8;gB+:8>'i:<G?HB+7%G;g~:Q58?+cE=If=>'CEIfBH=G?H5fF=9;gYhcHD"F?O^CHcc =5M>':<;:8;=:J<;B+GCHi==iG=LN?H5<CEc+CE>i:8G:fhECM^:,i:<GcECHA<C GCM^?cI<CH:[^=;:<;==s<Ç;?p9:<;="a i?HG?H>':8B+GCHc= ∆I iCHF7%9:<;g =5Gd5 (Si1.95 Ge2.05 )Hcr (T )J<D"Ifi:8G=>':<;Bp?OFnH;gYhU^Ç?+;;gYhws«R?HA<;=BHCH7%iG7%Af?OaJ8;:<GA8="a E \HgYF?2cHg~9=I[F:8;?2iCmeL6CHG>'7pF:HäEme =Â+Ã1 2ω ,2κPSÄEXDFEfGTtr (K) −∆Str · 10−4 ( Gq] )ÂOìÃÂ+ĬMÂHÊÂH¬ÆÃ¬ÆÃGd5 (Si1.95 Ge2.05 )Gd5 (Si1.7 Ge2.3 )Sm0.55 Sr0.45 M nO3TbErT b0.5 Dy0.5Â+ʬ8ÊÆÃs ì¬8ÃÂ"s Æ∂∆Eex∂T−Hcr ∂∆I∂T∂∆Eme∂T≥ 90%≤ 5%≤ 1%≥ 90%≤ 3%≤ 1%≥ 80%≤ 15%≤ 1%≥ 76%≤ 5%≤ 19%≥ 80%≤ 12%≤ 5%≥ 82%≤ 5%≤ 15% 7X@rY4\ Ï0¡:8;D%?cH:<F=9=;QG?H5fF=9;gYhàcHD"F?O^CHccÈRTWViG=LN?H5<CEcHg_hi:<G:<hEC8^?+hi:8GcHCEA<CGCM^?sWA ^: ω u~CEB+;CIf=B+:<FnH;?Oa^:8L6CHG>@?+¡="aZ? κ uI=>@?H:8>'CIfB+ns¢Ï0¡:8;D%?×BH:8>'i:8G?+B+7%G;CHk58?HcH=I<=>'CEI<B+= ω iC+F7%9:8;?4=5J<D"Ifi:8G=>':8;Bp?+FnH;gYhDG=cHgYh>@?HA<;=BHCEIfBHG=D¡==sCE9;CH:5<;?M9:8;=:Ib=>@?+:M>'CEIfBH= κ ZlD I<CM?+F:<;=]WZl;:=58cH:MIfB+;CZiCHJ8B+CE>'7=IfiC+FnE5<CHc?pF?+I<njcE:fF=9=;? 0.77 · 10−12 ( suIKJtfv ) Zac+Fa]0`?OaIbah?+G?HDB+:<G;CHk^FaIfCE:[^=;:<;=k{^?+;;CHA8C|D"F?EI<I8?s V ;:<GA8="aj?H;=58CHB+GCEi==dBO?+D":Q;:<=58cH:8I<B+;?Z;CqcCHDG:8IfBH;CEI<B+=B+:M>'i:<G?HB+7%GgT6]G=CE;?ZàiCHucE=%^=>'C>'7HZà;:8cH:fF=D%?=:<kl>'Cp;CiG:8;:<\EG:<9nsû@?+5<;CEIfBHnJ8;B+GCEi=kULN?+5HZcECH5<;=D%?H]`?+a«cEIfF:[^I<B+cH=:£I<D%?p9D%? ∂E iG=i:<G:<hEC8^:HZiCHD"?+5M?+;?«;?cEI<Bp?+cED:G=IHs Æ 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