Modified Pechini Synthesis of Proton‐Conducting Ba(Ce,Ti)O₃ and Comparative Studies of the Effects of Acceptors on its Structure, Stability, Sinterability, and Conductivity

Abstract

The phase structure, chemical stability, sinterability, and electrical performance of the proton-conducting Ba(Ce,Ti)O 3 solid solution with a series of acceptors M (M = In, Y, Sm) synthesized by a modified Pechini method were systematically investigated. The substitution of cerium with titanium was proved as an effective way to improve the stability of BaCeO 3 . Especially for the BaCe 0.95 Ti 0.05 O 3d sample doped with In, no change in the phase was found even after treatment in the atmosphere containing both CO 2 and H 2 O at 700°C for 10 h. Thanks to the highly sinteractive powders with particle size of~100 nm, dense ceramics were easily acquired. Moreover, compared with the undoped BaCe 0.95 Ti 0.05 O 3 sample, In, Y, and Sm dopants further improved the sinterability of the solid solution. In particular, In played a role of sintering aid and led to the largest linear shrinkage of the ceramics. As to the electrical performance, the transport properties of the samples under various atmospheres were analyzed and compared. The impedance tests demonstrated the best electrical performance of the Y-doped samples.

Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

“…The surface morphology is modified as the material reacts with these gases to create new phases. Thus, the applicability of the perovskites for some applications is limited, since they contain alkaline-earth metals than can react in the presence of gases like CO 2 and steam [48,119,120]. Doping strategies can again improve the tolerance to these gases.…”

“…Thus, one can conclude that an uncoated Co-based perovskite-type membrane for natural gas conversion to syngas in a membrane reactor is not feasible [8,121]. The thermal stability can be enhanced by partial substitution of Co and Fe (reducible ions) for less reducible metal ions, such as Ti [50,119], Zr [120], Ce [82,119], Al [122], and more.…”

Lattice Incorporation of Cu2+ into the BaCe0.7Zr0.1Y0.1Yb0.1O3−δ Electrolyte on Boosting Its Sintering and Proton-Conducting Abilities for Reversible Solid Oxide Cells

“…Furthermore, the diffracted peaks with no obvious signals of side products further reveal the excellent stability of BCZYYC2 in both moist hydrogen and air atmospheres (see Figure S2). Unlike the impurity ions occupying the lattice position of the ABO 3 -type perovskite oxide in other literatures, 27,32,33 the interstitial cupric ions in this work possess higher mobility, which may exhibit positive effects on enhancing the conductivity and sinterability of BCZYY. Figure 3a,b shows the thermal behavior of BCZYY and BCZYYC2 during sintering, respectively.…”