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Lanthanum Molybdate Nanoparticles from the Bradley Reaction: Factors Influencing Their Composition Structure and Functional Characteristics as Potential Matrixes for Luminescent Phosphors

机译:布拉德利反应中的钼酸镧纳米粒子:影响其组成结构和功能特性的因素作为发光荧光粉的潜在基质

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摘要

Interaction of lanthanum isopropoxide with molybdenum(VI) alkoxides in La/Mo ratios varying from 3:1 to 1:1 in acetophenon or allyl alcohol as solvents offers nanosized poorly crystalline products of complex composition, where the precipitation of Mo-rich ones is followed by the formation of La-rich ones with conservation of the reaction stoichiometry in total. Thermal treatment of the precipitates at temperatures over 700 °C leads to the formation of stoichiometric phases of the α- and β-La2Mo2O9 compositions. Introduction of smaller Re3+ cations such as Sm3+ by doping favors stabilization of the La2–xRExMo2O9 phase with improved crystallinity even after lower-temperature thermal treatment. The doping is successful only when the Re3+ (Sm3+, Eu3+, and Tb3+) is introduced as an alkoxide: application of Re3+(acac)3 as Re3+ sources leads to materials free from Re3+. The produced samples were characterized by XPD, TGA, SEM, and TEM studies as well as the luminescent properties for the Sm3+-doped phases.
机译:在苯乙酮或烯丙醇中,La / Mo比为3:1:1:1的异丙醇镧与烷氧基钼(VI)的相互作用作为溶剂提供了复杂组成的纳米级弱结晶产物,随后沉淀富Mo的产物通过形成富含La的化合物,总体上保留了化学计量。在超过700°C的温度下对沉淀物进行热处理会导致形成α-和β-La2Mo2O9组合物的化学计量相。通过掺杂引入较小的Re 3 + 阳离子,例如Sm 3 + ,即使在低温热处理后,也有助于稳定La2–xRExMo2O9相,并具有改善的结晶度。仅当Re 3 + (Sm 3 + ,Eu 3 + 和Tb 3 + >)以醇盐形式引入:将Re 3 + (acac)3作为Re 3 + 来源使用可产生不含Re 3 + 。通过XPD,TGA,SEM和TEM研究以及Sm 3 + 掺杂相的发光特性对制备的样品进行了表征。

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