首页> 外文会议>International symposium on solid oxide fuel cells >LATTICE PARAMETERS AND DEFECT STRUCTURE OF THE FLUORITE- AND C-TYPE OXIDE SOLID SOLUTIONS BETWEEN MO_2 AND M_2O_3
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LATTICE PARAMETERS AND DEFECT STRUCTURE OF THE FLUORITE- AND C-TYPE OXIDE SOLID SOLUTIONS BETWEEN MO_2 AND M_2O_3

机译:Mo_2和M_2O_3之间的萤石和C型氧化物固溶体的晶格参数和缺陷结构

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Lattice parameter data of a wide range of oxide solid solutions M_(1-y)M'_yO_(2-y/2) formed between the fluorite dioxides MO_2 (y=0) and the C-type sesquioxides M'O_(1.5) (y=l) are compiled and critically reviewed. Due to the formation of oxygen vacancy in the anion sublattice, the lattice parameters of these solid solutions exhibit a marked deviation from Vegard's law: the trend of this deviation is significantly positive (convex) for systems of larger tetravalent cations (Th~(4+), Ce~(4+)) and even slightly negative (concave) for systems of smaller cations (Zr~(4+), Hf~(4+)). A new crystal-chemical representation, which can give a straightforward description of such systematic variations of lattice parameters in these systems, is proposed. In this representation the lattice parameter of a given solid solution is evaluated using only one well-defined crystal-chemical parameter, r_c, the average cationic radius at the average oxygen coordination number (CN) of (8-2y) at that composition y. The numerical evaluation of this representation demonstrates its practical applicability for a variety of oxide solid solutions over the whole composition range between MO_2(y=0)and M'O_(1.5)(y=l).
机译:格子参数数据的宽范围的氧化物固溶体M_(1-Y)m'_yO_(2-y / 2)在氟盐二氧化酯Mo_2(Y = 0)和C型级氧化物M'O_(1.5)之间形成(y = l)被编制和批评。由于在阴离子子组中的氧空位,这些固体溶液的晶格参数表现出与VEGARD的法律的显着偏差:这种偏差的趋势是较大的四价阳离子的系统(凸起)的显着阳性(凸)(凸起)(4+ ),Ce〜(4 +))甚至较小阳离子系统略微阴性(凹)(Zr〜(4+),HF〜(4+))。提出了一种新的晶体化学表示,可以提出了对这些系统中的这种系统的这种系统变化的直接描述。在该表示中,仅使用一个明确的晶体化学参数,R_C,在该组合物Y上仅使用一个明确的晶体化学参数,R_c,平均阳离子半径(8-2℃)的平均阳离子半径来评估给定固溶的晶格参数。该表示的数值评估证明了在Mo_2(Y = 0)和M'O_(1.5)(Y = L)之间的整个组成范围内的各种氧化物固溶体的实际适用性。

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