EPR study of chromium-doped forsterite crystals: Cr3+(M1) with and without associated nearest-neighbor Mg2+(M2) vacancy
EPR study of chromium-doped forsterite crystals: Cr3+(M1) with and without associated nearest-neighbor Mg2+(M2) vacancy
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铬掺杂镁橄榄石晶体的 EPR 研究：具有和不具有相关最近邻 Mg2 (M2) 空位的 Cr3 (M1)
DOI：
10.1007/s00269-010-0393-0
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发表时间：
2011
影响因子：
1.4
通讯作者：
I. Ryabov
中科院分区：
文献类型：
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作者：
I. Ryabov
在两个不同的研究实验室中通过直拉法生长的掺铬镁橄榄石单晶的电子顺磁共振（EPR）研究表明，除了已知的顺磁中心Cr 3+（M1）、Cr 3+（M2）和Cr 4+外，Cr 3+离子取代M1位Mg 2+离子形成的新中心$$ {\text{Cr}}^{ 3+ }（M1）{-}V_{{\text{Mg}}^{ 2+ }}（M2）$$与M2位最近邻Mg 2+空位形成的新中心。对于该中心，常规的零场分裂参数D和E以及53 Cr超精细分裂的主要g值和A值已经确定如下：D = 33.95（3）GHz，E = 8.64（1）GHz，g = [1.9811（2），1.9787（2），1.9742（2）]，A = [51（3），52（2），44（3）] MHz。通过与未补偿电荷的离子Cr ~（3+）（M_1）和Cr ~（3+）（M_1）-Li ~（+）（M_2）的EPR谱的比较，确认了该中心的存在。结果表明，随着熔体中Li含量从0增加到~ 0.03wt%（Cr含量相同时为~ 0.07wt%），新心的浓度减小到零，而Cr ~（3+）（M1）和Cr ~（3+）（M1）-Li ~+（M2）心的浓度增加。已知的低温发光数据有关的中心正在考虑进行了讨论。
Electron paramagnetic resonance (EPR) study of single crystals of chromium-doped forsterite grown by the Czochralski method in two different research laboratories has revealed, apart from the known paramagnetic centers Cr3+(M1), Cr3+(M2) and Cr4+, a new center $$ {\text{Cr}}^{ 3+ } (M 1){-}V_{{{\text{Mg}}^{ 2+ } }} (M 2) $$ formed by a Cr3+ ion substituting for Mg2+ at the M1 structural position with a nearest-neighbor Mg2+ vacancy at the M2 position. For this center, the conventional zero-field splitting parameters D and E and the principal g values and A values of the 53Cr hyperfine splitting have been determined as follows: D = 33.95(3) GHz, E = 8.64(1) GHz, g = [1.9811(2), 1.9787(2), 1.9742(2)], A = [51(3), 52(2), 44(3)] MHz. The center has been identified by comparing EPR spectra with those of the charge-uncompensated ion Cr3+(M1) and the ion pair Cr3+(M1)–Li+(M2) observed in forsterite crystals codoped with chromium and lithium. It has been found that the concentration of the new center decreases to zero, whereas that of the Cr3+(M1) and Cr3+(M1)–Li+(M2) centers increases with an increase of the Li content from 0 up to ~0.03 wt% (at the same Cr content ~0.07 wt%) in the melt. The known low-temperature luminescence data pertinent to the centers under consideration are also discussed.
DOI：
10.1145/1874391.187410
发表时间：
1987-02
期刊：
ACM SIGSOFT Softw. Eng. Notes
影响因子：
--
作者：
Will Tribbey
通讯作者：
Will Tribbey