Distinct defect centers at oxygen positions in albite
Distinct defect centers at oxygen positions in albite
复制标题
钠长石中氧位置的明显缺陷中心
作者：
I. Petrov;A. Agel;S. Hafner
使用 9.2 GHz 5 至 260 K 之间的电子顺磁共振研究了 Amelia 钠长石单晶中的亚稳态电子空穴中心。六个不同的 O' 中心被识别为四个 Ot-/227A| 中心、一个 O1-/27A1 x 223Na 中心和一个 O1-/[Si,M2*] 中心。确定了它们的 g 和 A 张量值以及热稳定性极限。四个 Ot-/227 Alcenter 可分配给 Alt,,o,4.,o,-Altr(-)、Alrr(o)-OD(o)-Alr2(-)、Alr2(o)-Oc(-)-Alr,,-, 和 Alrzlo;-Oo1-y-Alt,1-1 桥（违反了 Loewenstein 规则），并指定为 co、do、c 和分别为d。它们的总浓度估计为每分子式单位NaAlSi3Or 2 x l0-4 至3 x l0-4。它们的光谱可以在 5 到 220 K 之间观察到，最大强度在 T^: 60 K 附近。在 523 K 下加热 3 小时后它们被破坏。计算出四面体 Al 位置 O'- (2p) 不成对电子的密度约为 0.006 e。 Or-/'ziAl x 223Na 中心可分配给 Sitr,o,-Oo,-Alt,r-r 桥并指定为 ai。其估计浓度至少为每个配方单位 I x lO-a。在20~120K，T^-110K之间可以观察到光谱。493K加热3h后光谱被破坏。 O' (2ps) 不成对电子
Metastable electron-hole centers in single crystals of Amelia albite were studied using electron paramagnetic resonance at 9.2 GHz between 5 and 260 K. Six distinct O' centers were identified as four Ot-/227A|centers, one O1-/27A1 x 223Na center, and one O1-/[Si,M2*] center. Values of their g and A tensors and limits of thermal stabilities were determined. The four Ot-/227 Alcenters could be assigned to Alt,,o,4.,o,-Altr(-), Alrr(o)-OD(o)-Alr2(-), Alr2(o)-Oc(-)-Alr,,-,, and Alrzlo;-Oo1-y-Alt,1-1 bridges (violations of the rule of Loewenstein) and are designated as co, do, c, and d, respectively. Their total concentration was estimated to be 2 x l0-4 to 3 x l0-4 per formula unit NaAlSi3Or. Their spectra could be observed between 5 and 220 K, the maximum intensities being near T^: 60 K. They were destroyed after heating at 523 K for 3 h. The calculated density of the O'- (2p) unpaired electron at the tetrahedral Al position is about 0.006 e. The Or-/'ziAl x 223Na center could be assigned to a Sitr,o,-Oo,-Alt,r-r bridge and is designated as ai. Its estimated concentration is at least I x lO-a per formula unit. The spectrum could be observed between 20 and 120 K, T^ - ll0 K. It was destroyed after heating at 493 K for 3 h. The O' (2ps) unpaired electron