New inorganic cobalt based blue pigments Mg_1‐xCo_xWO₄ (x = 0.1, 0.2 and 0.3) have been prepared by the solid state reaction and flux added methods. The synthesized samples show intense blue color with very low doping concentration of cobalt. Raising cost and toxicity make a critical need to reduce the consumption of cobalt in the ceramic industry, at the same time trying to improve the efficiency and sustainability of pigments. The present investigation help us minimize the cobalt consumption and cost of production with respect to conventional blue ceramic colorants. Intense blue hue was obtained at relatively low doping concentration of Co²⁺ (20 mol%) with b^* value of −46.97, which is considerably bluer than cobalt aluminate spinel (b^* = ‐32.70). UV‐visible absorption properties are strongly related to the coordination environment of the Co²⁺ ions. Increasing the amount of cobalt induces a change in the local symmetry of MgO₆ octahedra witnessed by the change of the metal‐ligand bond distances.The changes are attributed to the larger ionic radius and electronegativity of Co²⁺ ions compared to the Mg²⁺ ions in the host lattice.These observations corroborate the important structural distorsions arising from the differences in ionic radii and electronegativity between the dopant and host cations.

中文翻译：

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通过变质Co2 +八面体中的钨铁矿型Co2 +：MgWO4氧化物产生强烈的蓝色。

通过固相反应和助熔剂法制备了新型的无机钴基蓝色颜料Mg _{1 –x} Co _x WO ₄（x = 0.1、0.2和0.3 ）。合成的样品显示出强烈的蓝色，钴的掺杂浓度非常低。在陶瓷工业中，提高成本和毒性是减少钴消耗的关键需求，同时试图提高颜料的效率和可持续性。本研究帮助我们将常规蓝色陶瓷着色剂的钴消耗量和生产成本降至最低。在Co ²⁺（20 mol％）相对较低的掺杂浓度下获得强烈的蓝色调^*值为-46.97，比铝酸钴尖晶石要蓝得多（b ^* = -32.70）。紫外线可见吸收特性与Co ²⁺离子的配位环境密切相关。钴含量的增加导致MgO ₆八面体的局部对称性发生变化，这是由于金属配体键距的变化所致。这种变化归因于与Mg ²⁺相比，Co ²⁺离子具有更大的离子半径和电负性。这些观察结果证实了由掺杂剂和主体阳离子之间的离子半径和电负性差异引起的重要结构畸变。