Status : Verified
| Personal Name | Junio, Jonathan B. |
|---|---|
| Resource Title | Incorporating Sn2+ and Sr2+ ions into calcite for potential light absorbers and Eu2+ ions into calcite for light emitter applications |
| Date Issued | 13 September 2023 |
| Abstract | The incorporation of various elements in the form of ions into calcite had been explored for a wide range of applications. In this work, tin (Sn2+), strontium (Sr2+), and europium (Eu2+) ions were incorporated into calcite through two synthesis routes and for different intended applications. In the first synthesis route, Ca²⁺ cations were substituted by Sn²⁺ and Sr²⁺ cations in both P. placenta or Capiz shells and single-crystal calcite (in (100) and (001) orientations) through ion exchange reactions. Sn and Sr, which are potential alternatives to lead (Pb) in perovskite synthesis, were explored in transforming calcite, a polymorph of calcium carbonate (CaCO3) into a leaving group (MCO3 (M = Ba, Sr, or Ca) in the first step of a sequential ion-exchange reaction towards perovskite formation (CH3NH3PbX3). The second route was performed with the aim of exploring the photoluminescence (PL) and thermal properties of Eu-doped calcium carbonate by incorporating Eu2+ into calcite, through co-precipitation. Eu2+ was incorporated at different mass percentages from 0.625 to 20% at temperatures not exceeding the decomposition of both europium carbonate and calcium carbonate. At a curing temperature of 400°C, for 20% Eu, Eu2+ ions were initially incorporated into the calcium positions in calcite. As temperature is increased to 450°C, the oxidation of Eu2+, with the formation of europium sesquioxide (Eu2O3), was observed. Eu3+, with a smaller crystal radius, was preferentially incorporated into the calcite instead of the larger Eu2+ due to the reduction in the lattice parameters and crystal volume. PL results on the samples further showed red luminescence of Eu3+ at excitation and emission peaks of 390 and 619 nm, respectively. |
| Degree Course | PhD Materials Science and Engineering |
| Language | English |
| Keyword | calcite; ion exchange; co-precipitation; perovskite; photoluminescence |
| Material Type | Thesis/Dissertation |
Preliminary Pages
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Category : F - Regular work, i.e., it has no patentable invention or creation, the author does not wish for personal publication, there is no confidential information.
Access Permission : Open Access