The Cr³⁺ luminescence spectra of zoisite and kyanite, two geologically important minerals, were studied up to 40 and 20 GPa, respectively, in various pressure media. Cr³⁺ substitutes into the octahedral aluminum sites in both minerals and the R-line luminescence is a particularly sensitive site-specific probe of the octahedral Al site. Unlike many previous studies where Cr³⁺ luminescence was utilized, both these minerals have multiple highly distorted octahedral sites resulting in very large splitting of their R-lines, ~ 300 cm⁻¹ in zoisite and ~ 360 cm⁻¹ in kyanite (for reference, ruby is 29 cm⁻¹). For zoisite, the R-line splitting increases as pressure increases and more than triples from its ambient value by 40 GPa, while the R-line splitting in kyanite from the M1 and M2 sites does not change when compressed in a Ne pressure medium up to 20 GPa. We do not observe evidence of any phase transitions in either zoisite or kyanite across the pressure range of these new luminescence measurements. We present some high-pressure luminescence results where kyanite was known to be bridged between the diamond anvils and show how these spectra illustrate the different effect of uniaxial relative to hydrostatic stress on luminescence spectra.

在各种压力介质中分别研究了高达 40 GPa 和 20 GPa 的两种重要的地质矿物 黝帘石和蓝晶石的 Cr ^{3+发光光谱。}Cr ³⁺取代了两种矿物中的八面体铝位点，R 线发光是八面体铝位点的一个特别敏感的位点特异性探针。与许多先前使用 Cr ³⁺发光的研究不同，这两种矿物都具有多个高度扭曲的八面体位点，导致它们的 R 线非常大的分裂，在黝帘石中约为 300 cm ^-1 ，在蓝晶石中约为 360 cm ^-1（供参考） , 红宝石是 29 cm ^-1）。对于 zoisite，R 线分裂随着压力的增加而增加，并且比其环境值增加了 40 GPa，而蓝晶石中来自 M1 和 M2 位点的 R 线分裂在 Ne 压力介质中压缩时不会改变。 20 帕。在这些新的发光测量的压力范围内，我们没有观察到黝帘石或蓝晶石中任何相变的证据。我们展示了一些高压发光结果，其中已知蓝晶石桥接在金刚石砧之间，并展示了这些光谱如何说明单轴相对于静水应力对发光光谱的不同影响。