Structure, stability and electrical properties of the La(2−x)SrxMnO4±δ solid solution series

Abstract

/npsi/ctrl?action=rtdoc&an=9064984&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=9064984&lang=frAccess and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/j.ssi. 2006.01.009 Solid State Ionics, 177, 19-25, pp. 1849Ionics, 177, 19-25, pp. -1853Ionics, 177, 19-25, pp. , 2006 Structure, stability and electrical properties of the La(2− AbstractSingle phase materials of the La (2−x) Sr x MnO 4±δ (0.6 ≤ x ≤ 2.0) solid solution series were prepared via solid state reaction. The structure of each material was examined at room temperature and determined to be tetragonal for all phases examined. An expansion in lattice volume was observed on increasing lanthanum content. The stability and thermal expansion of each member of the solid solution series was determined via the use of in situ high temperature X-ray diffraction. It was found that all materials remained stable up to a temperature of 800°C. Thermal expansion coefficients were found to be in the region of 15 × 10 − 6 K − 1 for La (2−x) Sr x MnO 4±δ compounds where x N 1.4. The electrical conductivity of each phase was also determined over a similar temperature range with a maximum value of ∼6 Scm − 1 at 900°C for the x = 1.8 phase.

Synthesis, oxygen nonstoichiometry and total conductivity of (La,Sr)2(Mn,Ni)O4±

“…All single-phase oxides were indexed in the tetragonal space group I4/mmm. These results are in a good agreement with those reported earlier [1,[23][24][25][26][27][28][29]. However, it should be noted that Millburn et al [29] prepared the single-phase LaSrNi 0.5 Mn 0.5 O 4 only under dried deoxygenated argon flow at 1200-1300°C, but not in air.…”

“…A number of earlier works were focused on manganites La 2-x Sr x MnO 4± δ [25][26][27] due to their thermodynamic stability at high temperatures under reducing atmosphere (H 2 -N 2 ) compared to nickelates La 2-x Sr x NiO 4± δ and their ability to absorb sufficient amounts of oxygen (δ~0. 42) in an oxidizing atmosphere at~500°C.…”

Strontium And Iron Substituted Lanthanum Nickelate As Cathode Material In Solid Oxide Fuel Cells

“…The TEC values obtained from the HT XRPD results were calculated in approximation of non-textured polycrystalline materials with randomly oriented crystallites [11] according to the formula presented elsewhere [9]. The intermediate temperature Table 1.…”

Structural transformation and oxidation of Sr2MnO3.5+x determined by in-situ neutron powder diffraction

“…Samples of composition Sr 2 MnO 3±x were prepared using standard solid state synthesis techniques as previously suggested 6,19 . A significant background was observed, originating from the quartz ampoule used to contain the sample in the neutron beamline.…”

“…Oxides of the K 2 NiF 4 structure type are of interest for a number of technological applications and as such many studies have investigated the magnetic, electronic and structural properties of a wide range of compositions over a large temperature range [1][2][3][4][5][6][7][8][9][10] . Much of the earlier work was concerned with the low temperature behaviour of the La 2 CuO 4 11-13 and La 2 NiO 4 14 materials and their potential use in superconducting applications.…”