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The potential use of OH-defects in

机译：OH缺陷在中的潜在用途

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In this study, single crystals of pure enstatile (Mg_2Si_2O_6) were synlhesised under water-saturated conditions at 4 and 8 GPa and 1,150°C with variable silica activity, leading to phase assemblages enstatite + forste-rile, enstatite or enstatite + coesite. Run products were investigated using an FT1R spectrometer equipped with a focal plane array detector enabling IR imaging with a lateral pixel resolution of 2.7 urn. IR spectra within the OH-absorption region show two different groups of absorption bands: group 1 (wavenumbers at 3,592 and 3,687 cm~(-1)) shows strongest absorptions for E_β, whereas group 2 (wavenumbers at 3,067 and 3,362 cm"') shows strongest absorptions for E_γ. The groups are related to different defect types, group 1 to tetrahedral defects (T-site vacancies) and group 2 to octahedral defects (M-site vacancies). The intensity ratio of the bands within one group (i.e. A_(3067)/A_(3362) and A_(3592)/A_(3687)) and the intensity ratio of E_γ and E_α in group 2 bands remain constant within error. In contrast, the intensity ratio of group 2 to group 1 absorption bands [e.g. (A_(3362)/(A_(3687)] is sensitive to the SiO_2 activity and pressure. On the basis of the results of this and previous studies, a barometer for pure orthoenstatite coexisting with forsterite can be formulated: P [GPa] - 1.056+((1.025-A_(3362)/[(3362)+(3687)]/(0.009))~(1/2), where A_((3362) and A_((3687) are theintegral absorbances of the component E_γ of the absorption bands at 3,362 cm~(-1) and the component E_β of the absorption band at 3,687 cm~(-1), respectively.
机译：在这项研究中，在水饱和条件下，在4和8 GPa以及1,150°C的条件下，以纯二氧化硅合成Mg_2Si_2O_6单晶，并具有可变的硅石活性，从而生成了顽辉石+辉石，顽辉石或顽辉石+堇青石的相组合。使用配备有焦平面阵列检测器的FT1R光谱仪对运行产品进行了研究，该焦平面阵列检测器能够以2.7 um的横向像素分辨率进行红外成像。 OH吸收区内的红外光谱显示出两组不同的吸收带：第1组（在3,592和3,687 cm〜（-1）处的波数）显示出对E _β的最强吸收，而第2组（在3,067和3,362 cm处的波数） “'）对E _γ的吸收最强。各组与不同的缺陷类型相关，第1组为四面体缺陷（T位置空位），第2组为八面体缺陷（M位置空位）。一组内的频带（即A_（3067）/ A_（3362）和A_（3592）/ A_（3687））和第二组频带内的E _γ和E _α的强度比在误差内保持恒定。相比之下，第2组与第1组吸收带的强度比[例如（A_（3362）/（A_（3687）]）对SiO_2的活性和压力敏感。与镁橄榄石共存的纯正钙长石的化学式可表示为：P [GPa]-1.056 +（（1.025-A_（3362）/ [（3362）+（3687）] /（0.009））〜（1/2），其中A_（ （3362）和A _（（3687）a分别为3,362 cm〜（-1）的吸收带分量E _γ和3,687 cm〜（-1）的吸收带分量E _β的积分吸光度。

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