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Lead(II) fluoride particles synthesized by a straightforward mechanochemical route

AutorSubirana Manzanares, Maria Angels; Sánchez Sala, Marta; Pons, Josefina; Domingo Pascual, M. Concepción; Ayllón, José A.
Palabras claveMechanochemical
Lead(II) fluoride
Low temperature
Crystalline phase
Fecha de publicación15-ene-2016
CitaciónMaterials Letters 163: 76-80 (2016)
ResumenA low temperature mechanochemistry procedure was used to prepare lead(II) fluoride particles, with the objective of synthetizing pure α and β phases. Lead acetate trihydrate was reacted with ammonium fluoride by hand-grounding, thus forming a white liquid mixture containing lead(II) fluoride, water and ammonium acetate. A further short thermal treatment, performed at a low temperature (ca. 100 °C), allowed the evaporation of by-products, giving directly a powder constituted by pure PbF2. According to XRD analysis, the obtained product involved mostly the cubic β-PbF2 phase, with only traces of the orthorhombic α-PbF2 phase. SEM analysis indicated the formation of crystalline aggregates, without a well defined morphology. This synthetic strategy could be easily modified by adding small quantities of organic additives used to tune the crystalline phase. Hence, the addition of either citric acid or poly (acrylic acid-co-maleic acid) facilitated the production of the cubic phase (β-PbF2), while the addition of selected amines strongly favored the crystallization of the orthorhombic phase (α-PbF2).
Versión del editorhttp://dx.doi.org/10.1016/j.matlet.2015.10.085
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