Doping effects on the physicochemical and electrochemical properties of lanthanum manganite

Tikhonova, L. A.; Zhuk, P. P.; Poluyan, A. F.; Al'fer, S. A.; Voropaev, A. G.; Glushko, A. N.

doi:10.1007/bf02757981

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2005

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“…Physicochemical properties of manganites may alter following the substitution of 3 d elements with an oxidation degree of +2 for manganese [6]. For example, adding up to 0.1 mol of Co or Ni into the Mn sublattice increases not only the electronic conductance of manganite, but the ionic one as well.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical properties of electrode materials based on substituted yttrium manganite

Tikhonova¹,

Poluyan

Glushko

et al. 2005

Russ J Electrochem

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Electrode materials Y 0.5 Ca 0.5 Mn 1x (ëÓ, Ni ) x é 3 ( x = 0-0.1) have an o' -orthorhombic perovskite structure. Doping with transition metals raises the content of ions Mn 4+ from 49% at x = 0 to 62% at x = 0.05 Ni. At 500-650 K there takes place an o'-o -orthorhombic transition, with the thermal expansion coefficient rising from (7.1-8.1) × 10 -6 to (10.5-11) × 10 -6 ä -1 . Composition Y 0.5 Ca 0.5 Mn 1x (ëÓ, Ni ) x é 3 is n -type semiconductor with a considerable oxygen constituent at >1000 K. Effect of the electrode material composition on the resistance parameter ( ρ / d ) of an intermediate layer E/SE and on the polarization resistance ( R η ) of the triple-phase boundary E/SE/GP is similar. At 300-1100 K and 10 2 -10 5 Pa, minimum values of these quantities are exhibited by samples with the Y 0.5 Ca 0.5 Mn 0.95 Ni 0.05 é 3 electrode layer 50 mg cm -2 thick.

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Section: Introductionmentioning

confidence: 99%