High temperature charge ordering in Bi1−xSrxMnO3

Bi0.5Sr0.5MnO3 as cathode material for intermediate-temperature solid oxide fuel cells

“…1 shows the high temperature XRD patterns of BSM powders. Tetragonal perovskite structure is formed when BSM is fired at 1050 • C. This is consistent with those reported by Kim [6] and Chiba et al [12], who have fired the powder at 1050 • C and obtained a perovskite BSM. The lattice parameters are a = b = 3.8722Å, c = 3.7675Å.…”

“…The SDC powder was synthesized using a glycine-nitrate process [9] and summarized below. (NH 4 ) 2 Ce(NO 3 ) 6 and Sm(NO 3 ) 3 were dissolved in distilled water to form a nitrate solution, to which the glycine was added at a glycine to nitrate molar ratio of 0.5. The solution was heated till self-combustion occurred.…”

“…The curve of electrical conductivity versus temperature has transitions approximately at 220 and 600 • C, respectively. The transition at 220 • C corresponds to the onset of orbital and charge ordering [5,6]. The change at 600 • C may be caused by the phase change as shown in Fig.…”

“…Even though the ionic radius of Bi 3+ (1.24Å) is almost the same as that of La 3+ (1.22Å), due to its different electronic configuration, especially the highly polarizable 6s 2 lone pair, (Bi,Sr) MnO 3 perovskites have quite different magnetic and electric properties from that of (La,Sr) MnO 3 [5][6][7]. Yamada et al [7] have investigated the physical properties of single crystal Bi 1−x Sr x MnO 3 .…”

Electron spin resonance and resistivity studies of charge-ordered Bi(1−x)SrxMnO3

“…Based on these studies a magnetic phase diagram is provided over a wide range of x values. The high temperature resistivity, susceptibility and thermoelectric power (TEP) measurements are reported by Kim et al [25] on BSMO system. The susceptibility and resistivity data are reported to follow Curie-Weiss law and polaron variable range hopping (VRH) conduction mechanism respectively.…”