Nanocrystals of single-phase samarium monoaluminate(SmAlO3)were synthesized and studied for the first time.Malic acid was employed as a new complexing agent in the sol-gel process.The material was characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),energy-dispersive X-ray analysis(EDS),specific surface area and density.The lowest size of the nanoparticles was about50-60 nm and some of them formed agglomerates.The binding energies of core-level electrons of Sm(3d,4d,4f,5p,5s),Al(2s,2p)and O(1s,2s)in nanocrystalline SmAlO3 were obtained by X-ray photoelectron spectroscopy(XPS)and found shifted in respect to the corresponding values for the same elements.The temperature dependence of the AC magnetic susceptibility of the substance was determined between2.5 and 250 K.The experimental molar magnetic susceptibility was compared with the theoretical one of Sm3+ions.The nanomaterial was found paramagnetic in the specified temperature range with Curie-type paramagnetism below 12 K.
参考文献
| [1] | Mizuno M;Yamada T;Noguchi T .Phase diagram of the system Al2O3-Sm2O3 at high temperatures[J].Journal of the Ceramic Society of Japan,1977,85:374. |
| [2] | Coutures J P;Badie J M;Berojan R;Coutures J Flamand R Rouanet A .Stability and thermodynamic properties of rare earth perovskites[J].HIGH TEMPERATURE SCIENCE,1980,30:931. |
| [3] | Coutures J;Coutures J P .Etude par rayons X á haute temperaawe destransformations polymorphiques des perovskites LnAlO3 (Ln=èlèment ianthanique)[J].Journal of Solid State Chemistry,1984,52:95. |
| [4] | Vasylechko L;Scnyshyn A;Bismayer U;Gschneidner K A Jr,Bünzli J C G,Pecharsky V K.Handbook on the Physics and Chemistry of Rare Earths[M].Amsterdam:Elsevier Science,2009:39. |
| [5] | Tsuji T;Ohashi Y;Yamamura Y.Effect of ionic radius on electrical conductivity of doped SmAlO3 perovskite oxide[A].Australia,2001 |
| [6] | Zhu J;Kipkoech E R;Lu W .Effects of LnAlO3 (Ln=La,Nd,Sin) additives on the properties of Ba4.2Nd9 2Ti18O54 ceramics[J].Journal of the European Ceramic Society,2006,26:2027. |
| [7] | Cho S E;Kim I T;Hong K S .Microwave dielectric properties and applications of rare-earth ahiminates[J].Journal of Materials Research,1999,14:114. |
| [8] | Goddard W A;Brenner D W;Lyshevski S E;Iafrate G J.Handbook of Nanoscience,Engineering,and Technology[M].Boca Raton:crc Press,2007 |
| [9] | Rao C N R;Cbeetham A K .Science and technology of nanomaterials:current stares and future prospects[J].Journal of Materials Chemistry,2001,11:2887. |
| [10] | Bredol M;Schem M .Structured sol-gel-films doped with lanthanides[R].Muenster University of Applied Sciences,Germany,2006. |
| [11] | Van Vleck J H.The Theory of Electric and Magnetic Susceptibilities[M].London,Oxford:Oxford University Press,1932 |
| [12] | Casey A T;Mitra S.Magnetic behavior of lanthanide compounds[A].New York:Wiley-Interscience,1976 |
| [13] | Taylor K N R;Darby M.Physics of Rare Earth Solids[M].London:Chapman and Hall,1970 |
| [14] | De Wijn H W;Van Diepen A M;Buschow K H J .Samarium in strong crystal fields,a case of strong J-mixing[J].Physical Status Solidi B Basic Research,1976,76:11. |
| [15] | Uryu N .On the paramagnetic susceptibility of Sm3+ ion[J].Journal of the Physical Society of Japan,1960,15:2041. |
| [16] | Pechini M P .Method of preparing lead and alkaline earth titanates and niobates and coating method using the same to form a capacitor[P].US Patent 3330697,1967. |
| [17] | Mathur S.;Veith M.;Shen H.;Hufner S.;Jilavi MH. .Structural and optical properties of NdAlO3 nanocrystals embedded in an Al2O3 matrix[J].Chemistry of Materials,2002(2):568-582. |
| [18] | Cizauskaite S;Reihlova V;Nenartaviciene G;Beganskiene A Pinkas J Kareiva A .Sol-gel preparation and characterization of perovskite gadolinium aluminates[J].MATERIALS SCIENCE-POLAND,2007,25:755. |
| [19] | Hatscher S;Schilder H;Lueken H;Urland W .Practical guide to measurement and interpretation of magnetic properties[J].Pure and Applied Chemistry,2005(2):497-511. |
| [20] | Capitan M J;Malet P;Centeno M A;Munoz-Paez A Cardzosa I Odriozola J A .Samarium oxide (Sm2O3) alumina catalysts for methane coupling Influence of the structure of surface samarium-aluminium-oxygun phases on the reactivity[J].Journal of Physical Chemistry,1993,97:9233. |
| [21] | Williams G P.Electron binding energies of the elements[A].Boca Raton:crc Press,2005 |
| [22] | Mercier F;Alliot C;Bion L;Thromat N Toulhoat P .XPS study of Eu(Ⅲ) coordination compounds:core level binding energies in solid mixed oxo-compounds EumXxOy[J].Journal of Electron Spectroscopy and Related Phenomena,2006,150:21. |
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