The role of the Pb2+ lone electron pair for bond valence sum analysis in mullite-type PbMBO4 (M = Al, Mn and Fe) compounds

The role of the Pb2+ lone electron pair for bond valence sum analysis in mullite-type PbMBO4 (M = Al, Mn and Fe) compounds
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Pb2 孤电子对在莫来石型 PbMBO4(M = Al、Mn 和 Fe)化合物键价和分析中的作用

DOI:
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发表时间:
2012
期刊:
影响因子:
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通讯作者:
T. Gesing
T. Gesing
中科院分区:
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文献类型:
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作者:
M. Murshed;R. Fischer;T. Gesing

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摘要 对三个系列莫来石型化合物 PbMnxAl1–xBO4、PbFexAl1–xBO4 和 PbMnxFe1–xBO4 (x = 0 – 1) 的组成原子的键价和 (BVS) 进行了分析,特别重点分析了铅。虽然共边 MO6 八面体中一个桥接氧原子的形式 BVS 被发现键合不足,但另一个桥接原子却键合过度。在整个系列中,铅原子始终表现出过度键合的性质,并且表现出与预期化合价不同的键合强度。 Pb2+ 阳离子的 6s2 孤电子对 (LEP) 的立体活性根据偏心率参数 (|Φi|) 的绝对值进行监测。计算得出的 Pb2+ 阳离子的 BVS 和键价参数 (r0i) 均与 |Φi| 呈线性相关,从而证实了 Wang-Liebau [Z.克里斯塔洛格。 211 (1996) 437]关于孤对电子对键价参数影响的假设。
Abstract The bond valence sums (BVS) of the constituent atoms of three series of mullite-type compounds PbMnxAl1–xBO4, PbFexAl1–xBO4 and PbMnxFe1–xBO4 (x = 0 – 1) were analyzed with particular emphasis on lead. While the formal BVS of one bridging oxygen atom in the edge-sharing MO6 octahedron was found to be under-bonded, the other bridging atom is over-bonded. The lead atom showed always an over-bonded nature throughout the series and exhibited a different bonding strength than that of the expected valence. The stereoactivity of the 6s2 lone electron pair (LEP) of the Pb2+ cation was monitored in terms of the absolute value of the eccentricity parameter (|Φi|). Both calculated BVS and bond valence parameter (r0i) of Pb2+ cation showed a linear correlation with |Φi|, thus corroborated the Wang–Liebau [Z. Kristallogr. 211 (1996) 437] hypothesis concerning the influence of lone-pair electrons on bond-valence parameters.
DOI: 10.1016/j.materresbull.2012.03.014
发表时间: 2012
影响因子: 5.4
作者:
Murshed;Fischer;Gesing;Th. M.
通讯作者: Th. M.