RT Journal Article
T1 Seeing oxygen disorder in YSZ/SrTiO_(3) colossal ionic conductor heterostructures using EELS
A1 Pennycook, T. J.
A1 Oxley, M. P.
A1 Garcia Barriocanal, Javier
A1 Bruno, Flavio Yair
A1 León Yebra, Carlos
A1 Santamaría Sánchez-Barriga, Jacobo
A1 Pantelides, S. T.
A1 Varela del Arco, María
A1 Pennycook, S. J.
AB Colossal ionic conductivity was recently discovered in YSZ/SrTiO_(3) multilayers and was explained in terms of strain- and interface-enhanced disorder of the O sublattice. In the present paper we use a combination of scanning transmission electron microscopy and electron energy loss spectroscopy (EELS) and theoretical EELS simulations to confirm the presence of a disordered YSZ O sublattice in coherent YSZ/SrTiO_(3) multilayers. O K-edge fine structure simulated for the strained disordered O sublattice phase of YSZ possesses blurred-out features compared to that of ordered cubic bulk YSZ, and experimental EELS fine structure taken from the strained YSZ of coherent YSZ/SrTiO_(3) thin films is similarly blurred out. Elemental mapping is shown to be capable of resolving ordered YSZ O sublattices. Elemental mapping of O in the coherent YSZ/STO multilayers is presented in which the O sublattice is seen to be clearly resolved in the STO but blurred out in the YSZ, indicating it to be disordered. In addition, we present imaging and EELS results which show that strained regions exist at the incoherent interfaces of YSZ islands in STO with blurred out fine structure, suggesting these incoherent regions may also support high ionic conductivities. Recently, Cavallaro et al. reported electronic conductivities in samples of incoherent disconnected islands embedded in STO that are similar to the islands described herein. The presence of a region of O depleted STO at the interface with incoherent YSZ islands is revealed by EELS elemental mapping, implying the n-type doping of STO/YSZ nanocomposites with disconnected incoherent YSZ islands.
PB E D P Sciences
SN 1286-0042
YR 2011
FD 2011-06
LK https://hdl.handle.net/20.500.14352/44565
UL https://hdl.handle.net/20.500.14352/44565
LA eng
NO 1) B.C.H. Steele, A. Heinzel, Nature, 414, 345 (2001).2) R.M. Ormerod, Chem. Soc. Rev., 32, 17 (2002).3) J.B. Goodenough, Ann. Rev. Mater. Res., 33, 91 (2003)4) J.A. Kilner, Nat. Mater., 7, 838 (2008).5) J. Maier, Solid State Ion., 131, 13 (2000).6) N. Sata, K. Eberman, K. Eberl, J. Maier, Nature, 408, 946 (2000).7) A. Peters, C. Korte, D. Hesse, N. Zakharov, J. Janek, Solid State Ion., 178, 67 (2007).8) C. Korte, A. Peters, J. Janek, D. Hesse, N. Zakharov, Phys. Chem. Chem. Phys., 10, 4623 (2008).9) I. Kosacki, C.M. Rouleau, P.F. Becher, J. Bentley, D.H. Lowndes, Solid State Ion., 176, 1319 (2005).10) C.A.J. Fisher, H. Matsubara, J. Eur. Ceram. Soc., 19, 703 (1999).11) J. García-Barriocanal, A. Rivera-Calzada, M. Varela, Z. Sefrioui, E. Iborra, C. León, S.J. Pennycook, J. Santamaría, Science, 321, 676 (2008).12) K. Suzuki, M. Kubo, Y. Oumi, R. Miura, H. Takaba, A. Fahmi, A. Chatterjee, K. Teraishi, A. Miyamoto, Appl. Phys. Lett., 73, 1502 (1998).13) J.W. Matthews, A.E. Blakeslee, J. Cryst. Growth, 27, 118 (1974).14) X. Guo, Science, 324, 465 (2009).15) J. García-Barriocanal, A. Rivera-Calzada, M. Varela, Z. Sefrioui, E. Iborra, C. León, S. Pennycook, J. Santamaría, Science, 324, 465 (2009).16) T.J. Pennycook, M.J. Beck, K. Varga, M. Varela, S.J. Pennycook, S.T. Pantelides, Phys. Rev. Lett., 104, 115901 (2010).17) R. Buczko, G. Duscher, S.J. Pennycook, S.J. Pantelides, Phys. Rev. Lett., 85, 2168 (2000).18) W. Luo, M. Varela, J. Tao, S.J. Pennycook, S.T. Pantelides, Phys. Rev. B, 79, 052405 (2009).19) O.L. Krivanek, G.J. Corbin, N. Dellby, B.F. Elston, R.J. Keyse, M.F. Murfitt, C.S. Own, Z.S. Szilagyi, J.W. Woodruff, Ultramicroscopy, 108, 179 (2008).20) M. Bosman, M. Watanabe, D.T.L. Alexander, V.J. Keast, Ultramicroscopy, 106, 1024 (2006).21) M. Varela, M.P. Oxley, W. Luo, J. Tao, M. Watanabe, A.R. Lupini, S.T. Pantelides, S.J. Pennycook, Phys. Rev. B, 79, 085117 (2009).22) P. Hohenberg, W. Kohn, Phys. Rev., 136, 864 (1964).23) W. Kohn, L.J. Sham, Phys. Rev., 140, A1133 (1965).24) P.E. Blöchl, Phys. Rev. B, 50, 17953 (1994).25) G. Kresse, J. Furthmuller, Phys. Rev. B, 54, 11169 (1996).26) P.E. Blöchl, O. Jepsen, O.K. Andersen, Phys. Rev. B, 49, 16223 (1994).27) L.J. Allen, S.D. Findlay, M.P. Oxley, C.J. Rossouw, Ultramicroscopy, 96, 47 (2003).28) L.J. Allen, C.J. Rossouw, Phys. Rev. B, 42, 11644 (1990).29) M.P. Oxley, L.J. Allen, Phys. Rev. B, 57, 3273 (1998).30) T.J. Pennycook, M. Varela, M.J. Beck, J. García Barriocanal, F.Y. Bruno, C. León, J. Santamaría, S.T. Pantelides, S.J. Pennycook, Microsc. Microanal., 16, 100 (2010).31) M. Kim, G. Duscher, N.D. Browning, K. Sohlberg, S.T. Pantelides, S.J. Pennycook, Phys. Rev. Lett., 86, 4056 (2001).32) R.F. Klie, J.P. Buban, M. Varela, A. Franceschetti, C. Jooss, Y. Zhu, N.D. Browning, S.T. Pantelides, S.J. Pennycook, Nature, 435, 475 (2005).33) A. Cavallaro, et al., Solid State Ion., 181, 592 (2010).
NO © EDP Sciences.  The authors are grateful to C. Cantoni for the bulk YSZ sample, M. Watanabe for the PCA plug in for Digital Micrograph and J. Luck for sample preparation. Research at Oak Ridge National Laboratory was sponsored by the US Department of Energy, Office of Science, Materials Sciences and Engineering Division (MPO, MV, SJP). Research at Vanderbilt was supported in part by the US Department of Energy Grant DEFG02- 09ER46554 (TJP, STP) and the McMinn Endowment (STP). Research at Universidad Complutense was supported by the Spanish Ministry for Science and Innovation, and the Madrid Regional Government. Computations were performed at the National Energy Research Scientific Computing Center at Lawrence Berkeley National Laboratory.
NO US Department of Energy, Office of Science, Materials Sciences and Engineering Division
NO McMinn Endowment
NO Spanish Ministry for Science and Innovation
NO Madrid Regional Government
DS Docta Complutense
RD 28 abr 2024