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Characterization of yellow and red inorganic pigments from Mg0.5Cu1.5VxP2−xO7 (0 ≤ x ≤ 2) solid solutions

AuthorsTena, M. A.; Mendoza-Meroño, R.; Martínez, David CSIC; Trobajo, Camino CSIC ORCID; García, José R. CSIC ORCID; García-Granda, Santiago CSIC ORCID
Issue Date2020
PublisherSpringer Nature
CitationSN Applied Sciences 2: 1106 (2020)
AbstractThe structural characterization of Mg0.5Cu1.5VxP2−xO7 (0.0 ≤ x ≤ 2.0) compositions was performed and the colour parameters of these materials measured. Solid solutions in the α-Cu2P2O7, β-Cu2P2O7 and β-Cu2V2O7 structures were obtained by incorporation of V(V) in the α-Cu2P2O7 and β-Cu2P2O7 structures and P(V) in the β-Cu2V2O7 structure. Solid solutions with the α-Cu2P2O7 structure are obtained at 500–600 °C when the vanadium:phosphorus ratio is lower than 2/3 (x ≤ 1.2). At 600 °C, these materials have a bright yellow colour. In these compositions, the transition to the β-Cu2P2O7 structure occurs at 800 °C. This transition modifies the colour but it keeps the yellow colouration for compositions. At 1000 °C, the Cu3P2O8 phase coexists with the β-Cu2P2O7 phase and the yellow colouration is lost. Solid solutions with the β-Cu2V2O7 structure are obtained at 600–800 °C when the amount of vanadium is high (x ≥ 1.5). The increase in the amount of vanadium in Mg0.5Cu1.5VxP2−xO7 (0.0 < x ≤ 2.0) compositions changes the colour of the materials from yellow to red at 600 °C (the Mg0.5Cu1.5P2O7 composition, x = 0.0, is pale green). The colour of the materials darkens with increasing temperature and compositions with x > 1.5 melted at 1000 °C.
Publisher version (URL)https://doi.org/10.1007/s42452-020-2917-7
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