Solid solutions of Bi₁₂Mn_1-xM_xO₂₀ (M ​= ​Ti, Si, Ge, x ​= ​0–1) and Bi_12-xIn_xMn_0.2Ti_0.8O₂₀ (x ​= ​0–4.0) having Bi₁₂MO₂₀ sillenite-type structure were synthesized through M-site and Bi-site substitutions and their properties were evaluated. Powder neutron and X-ray structure analyses confirm that all the compounds crystallize in space group I23 with Mn in the tetrahedral site. The color of Bi₁₂Mn_1-xM_xO₂₀ (M ​= ​Ti, Si, Ge) solid solutions varies from dark green (x ​= ​0) to intense green (x ​= ​0.8), and the x ​= ​1 phases Bi₁₂MO₂₀ (M ​= ​Ti, Si, Ge) are light yellow. Substituting indium for bismuth brings a yellowish hue to the Bi₁₂Mn_1-xTi_xO₂₀ series as shown in Bi_12-xIn_xMn_0.2Ti_0.8O₂₀ (x ​= ​0–4.0). Optical measurements suggest that the d-d transition of Mn ions combined with the M⁴⁺–O^2- charge transfer is responsible for the observed green colors. All compositions exhibit high near-infrared reflectance (NIR) which makes them potential candidates for cool pigment applications. The Bi₁₂Mn_1-xTi_xO₂₀ (x ​= ​0.2, 0.6, 0.8) compounds show paramagnetic behavior in 5–300K temperature region, and the effective magnetic moment is slightly smaller than theoretical magnetic moment of tetravalent Mn. This is one of the few cases where tetrahedrally coordinated Mn⁴⁺ functions as a chromophore in inorganic metal oxides.

Bi ₁₂ Mn _{1- x} M _x O ₂₀（M  = Ti，Si，Ge，x  = 0-1）和Bi _{12- x} In _x Mn _0.2 Ti _0.8 O ₂₀（x  = ）的固溶体通过M-位和Bi-位取代合成具有Bi ₁₂ M O ₂₀硅型结构的Bi（0-4.0），并评估其性能。粉末中子和X射线结构分析证实所有化合物均在空间I组中结晶23在四面体部位带有Mn。Bi ₁₂ Mn _{1- x} M _x O ₂₀（M  = Ti，Si，Ge）固溶体的颜色从深绿色（x  = 0）到深绿色（x  = 0.8）不等。x  = 1相Bi ₁₂ M O ₂₀（M  = Ti，Si，Ge）为浅黄色。用铋代替铟会为Bi ₁₂ Mn _{1- x} Ti _x O ₂₀系列带来淡黄色调，如Bi _{12- x} In _x Mn所示_0.2钛_0.8 O ₂₀（x  = 0-4.0）。光学测量表明，Mn离子的dd跃迁与M ⁴⁺ -O ^2-电荷转移相结合是观察到的绿色的原因。所有组合物均表现出高的近红外反射率（NIR），这使其成为冷颜料应用的潜在候选者。Bi ₁₂ Mn _{1- x} Ti _x O ₂₀（x = 0.2、0.6、0.8）化合物在5–300K温度范围内表现出顺磁行为，有效磁矩略小于四价Mn的理论磁矩。这是在无机金属氧化物中四面体配位的Mn ⁴⁺作为生色团的少数情况之一。