Flux Growth of [NaK6F][(UO2)3(Si2O7)2] and [KK6Cl][(UO2)3(Si2O7)2]: The Effect of Surface Area to Volume Ratios on Reaction Products
Flux Growth of [NaK6F][(UO2)3(Si2O7)2] and [KK6Cl][(UO2)3(Si2O7)2]: The Effect of Surface Area to Volume Ratios on Reaction Products
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[NaK6F][(UO2)3(Si2O7)2] 和 [KK6Cl][(UO2)3(Si2O7)2] 的通量增长：表面积与体积比对反应产物的影响
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发表时间：
2016
期刊：
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通讯作者：
H. Loye
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作者：
G. Morrison;H. Loye
用混合碱金属卤化物盐助熔剂生长了两种新的盐包裹型铀（VI）硅酸盐单晶[NaK 6 F][（UO 2）3（Si 2 O 7）2]和[KK 6Cl][（UO 2）3（Si 2 O 7）2]。两种化合物均为[NaRb 6 F][（UO 2）3（Si 2 O 7）2]结构类型，正交晶系空间群Pnnm，晶格参数a = 11.0819（5）A，B = 13.1149（6）A，c = 7.8418（4）A（[NaK 6 F]），a = 11.0830（7）A，B = 13.5850（4）A，c = 7.8693（5）A（[KK6Cl]）。反应的表面积与体积（SA/vol）比由反应容器尺寸控制，对具有小SA/vol比的反应产物具有强烈的影响，其有利于盐包合物相的生长。这两种化合物都表现出铀酰基团的典型发光，[KK 6Cl][（UO 2）3（Si 2 O 7）2]的发光强度低于[NaK 6 F][（UO 2）3（Si 2 O 7）2]，可能是由于Cl-离子的猝灭。
Single crystals of two new salt-inclusion uranium(VI) silicates, [NaK6F][(UO2)3(Si2O7)2] and [KK6Cl][(UO2)3(Si2O7)2], were grown from mixed alkali halide salt fluxes. Both compounds crystallize in the [NaRb6F][(UO2)3(Si2O7)2] structure type in the orthorhombic space group Pnnm with lattice parameters a = 11.0819(5) A, b = 13.1149(6) A, and c = 7.8418(4) A ([NaK6F]) and a = 11.0830(7) A, b = 13.5850(4) A, and c = 7.8693(5) A ([KK6Cl]). The surface area to volume (sa/vol) ratio of the reaction, controlled by the reaction vessel dimensions, has a strong influence on the reaction products with small sa/vol ratios favoring the growth of the salt-inclusion phases. Both compounds exhibit the typical luminescence of the uranyl group with the luminescence of [KK6Cl][(UO2)3(Si2O7)2] being less intense than [NaK6F][(UO2)3(Si2O7)2], likely due to quenching by the Cl– ions.