Ceramics-Silikáty 63, (1) 100 - 109 (2019) |
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STRUCTURAL AND LUMINESCENT PROPERTIES OF EUROPIUM-DOPED AND UNDOPED HYDROXYAPATITE POWDERS SINTERED BY SPARK PLASMA
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García Domínguez G. 1, Garrido Hernández A. 2, Cerón Montes G. 2, Morales Ramírez A.J. 1, Díaz de la Torre S. 1
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1 Instituto Politécnico Nacional, CIITEC IPN, Cerrada de Cecati S/N, CP 02250, Col. Santa Catarina Azcapotzalco Ciudad de México, México
2 Universidad Tecnológica de Tecámac, UTTEC, Carretera Federal México, Pachuca Km 37.5, CP 55740, Col. Sierra Hermosa, Tecámac, Estado de México, México
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Keywords: Ceramics, Luminescence, SPS
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This paper studies the structural and photoluminescent properties of hydroxyapatite (HA) and europium-doped hydroxyapatite (HA:Eu) synthesised by the hydrothermal method and sintered by the spark plasma sintering (SPS) technique. HA and HA:Eu powders, synthesised at pH of 10, 11 and 12, were characterised by means of infrared spectroscopy, X-ray diffraction, scanning electron microscopy, Raman spectroscopy and luminescence spectroscopy. The HA and HA:Eu samples were sintered using the SPS technique at 900 and 1200 °C. It was determined that the HA and HA:Eu powders crystallised in the hexagonal phase, which is stable until 900 °C. The presence of Eu3+ ions tended to stabilise the hexagonal phase of hydroxyapatite at 1200 °C. Undoped hydroxyapatite sintered at 1200 °C revealed a significant amount of tricalcium phosphate (β-TCP) as a result of its decomposition. By increasing the heat treatment temperature, different emission lines (⁵D₀→ ⁷F₀, ⁵D₀→ ⁷F₁ and ⁵D₀→ ⁷F₂ transitions) were obtained due to calcium site substitution by the europium ions in the HA structure. |
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doi: 10.13168/cs.2019.0002
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