OCCURRENCE OF SUPEROXIDE RADICAL ION IN CRYSTALLINE 12CAO.7AL2O3 PREPARED VIA SOLID-STATE REACTIONS
OCCURRENCE OF SUPEROXIDE RADICAL ION IN CRYSTALLINE 12CAO.7AL2O3 PREPARED VIA SOLID-STATE REACTIONS
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DOI：
10.1021/ic00255a003
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发表时间：
1987-04-22
影响因子：
4.6
通讯作者：
ABE, Y
中科院分区：
文献类型：
--
作者：
HOSONO, H;ABE, Y
超氧阴离子是氧的一种活性物种，在涉及02的许多化学反应中起着重要的作用。On或In固体氧化物的形成通常是借助高能光子，如紫外线、X射线或7射线辐射实现的。通过CaC03与A1203或Al(OH)3粉末的固相反应，在没有任何伴随辐照的情况下，发现12Ca07Al203晶体中存在Of，其浓度高达约4×1018个单位/g，从线形随温度的变化可以推断，Of存在于晶格固有的结构空穴中。在无氧气氛下，On-On离子取代和加热时Of的浓度急剧下降，强烈地表明Of的发生与“游离氧”密切相关，这是12CaO-7Al203晶体的独特特征。12CaO-7Al203的这些特征与蓝宝石NaS[Si6Al6024]S2的特征相似。
Superoxide radical ion Of is an active species of oxygen and is known to playimportant roles in many chemical reactions involving 02. The formation of Of on or in solid oxides is usually achieved with the aid of energetic photons such as UV, X-ray, or 7-ray radiation. It has been found that Of occurs in the 12Ca07Al203 crystal prepared by the solid-state reaction between CaC03 and A1203 or Al (OH) 3 powder without any accompanying irradiation; the concentration of Of goes up to ca. 4 X 1018 units/g. From the change in the line shape with temperature, the Of is concluded to be included in the structural cavity inherent in the crystal lattice. A drastic reduction in the concentration of Of on anion substitution and on heating under an oxygen-free atmosphere strongly suggests that the occurrence of Of is closely related with “free oxygen”, which is a unique characteristic of the 12Ca0-7Al203 crystal. Such characteristics found for 12CaO-7Al203 are analogous to those for ultramarine, Nas [Si6Al6024] S2.