Type IIb diamonds are those that contain more boron than nitrogen. The presence of this uncompensated boron gives rise to absorption in the infrared part of the electromagnetic spectrum, extending into the visible region and often resulting in blue colouration. Here we report on the expansion of the DiaMap freeware (for the automated spectral deconvolution of Type I [nitrogen containing] diamonds) to work on Type IIb diamonds, returning concentrations from three boron-related absorption bands, and determining which band provides the most reliable value. The program uses the calibration coefficients of Collins (2010), which show good relative agreement between the three bands, but might require some further study to confirm their absolute accuracy to the uncompensated boron concentration. The methodology of DiaMap_IIb is applicable to all Type IIb diamonds, both natural and synthetic. Analysis of high-resolution Fourier-transform infrared (FTIR) maps of two high-pressure high-temperature (HPHT) synthetic diamonds using DiaMap_IIb, confirm the growth sector dependence of the boron incorporation. Partitioning of boron strongly favours the octahedral {111} sectors.

IIb型钻石是硼含量高于氮含量的钻石。这种未补偿的硼的存在会导致电磁波谱的红外部分吸收，并延伸到可见光区域，并经常导致蓝色。在这里，我们报告了DiaMap免费软件的扩展（用于I型（含氮）钻石的自动光谱去卷积），用于IIb型钻石，返回了三个与硼有关的吸收带的浓度，并确定哪个带提供了最可靠的吸收带。值。该程序使用柯林斯（2010）的校准系数，该校准系数在三个波段之间显示出良好的相对一致性，但可能需要进一步研究以确认其对未补偿硼浓度的绝对准确性。DiaMap_IIb的方法学适用于所有IIb型天然和合成钻石。使用DiaMap_IIb分析两种高压高温（HPHT）合成钻石的高分辨率傅里叶变换红外（FTIR）图，确认了硼掺入对生长扇区的依赖性。硼的分配强烈地有利于八面体{111}扇区。