Five transition metal borates were synthesized in a Walker-type module under high-pressure/high-temperature conditions of 8–9 GPa and 800–1200 °C. They all exhibit the same interpenetrating, anionic borate network B12O26 16−, crystallizing in the space group I41/acd, and therefore show high similarities to the borates Ti5B12O26 and Ga5B12O25(OH). Cr5B12O25(OH) and V5B12O25(OH) are isotypic to Ga5B12O25(OH), whereas Mn5Mn0.83B12O26 and Fe5Fe0.14B12O24.3(OH)1.7 feature the partial occupation of an additional, cuboctahedral cavity in the structure. This is due to a partial reduction of the cations to the oxidation state +2, as presented with the novel compound Mn5MnB12O22(OH)4, which only features Mn2+ for charge compensation. These structures feature a twelvefold coordination of manganese and iron.

中文翻译：

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扩展和调整 M 5B12O25(OH) 结构类型以纳入二价和三价过渡金属阳离子

在 8-9 GPa 和 800-1200 °C 的高压/高温条件下，在 Walker 型模块中合成了五种过渡金属硼酸盐。它们都具有相同的互穿阴离子硼酸盐网络 B12氧26 16−，在空间群中结晶我41/交流中心，因此与硼酸盐 Ti 表现出高度相似性5乙12氧26和嘎5乙12氧25（哦）。铬5乙12氧25(OH) 和 V5乙12氧25(OH) 与 Ga 是同型的5乙12氧25(OH)，而 Mn5锰0.83乙12氧26和铁5铁0.14乙12氧24.3（哦）1.7其特点是在结构中部分占据了一个额外的立方八面体空腔。这是由于阳离子部分还原至氧化态 +2，如新型化合物 Mn 所示5锰硼12氧22（哦）4，仅含有 Mn2+用于电荷补偿。这些结构的特点是锰和铁的十二重配位。