July 22, 2020 Presentation Open Access

Neves, Filipe; Esperto, Luís; Figueira, Isabel; Mascarenhas, João; Salgueiro, Rute; Pena Silva, Teresa; Brito Correia, José; de Oliveira, Daniel; Almeida, Patricia

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    <subfield code="a">This work is funded by national funds through the FCT – Fundação para a Ciência e a Tecnologia, I.P., under the project PTDC/EAM-PEC/29905/2017 (Project LocalEnergy – "Local Resources for Multifunctional Tetrahedrite-based Energy-Harvesting Applications", (http://localenergy.lneg.pt).</subfield>
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    <subfield code="d">July 21-23, 2020</subfield>
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    <subfield code="a">Virtual Conference on Thermoelectrics, VCT 2020</subfield>
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    <subfield code="a">Processing of tetrahedrite-based thermoelectric materials using tetrahedrite-tennantite copper ores</subfield>
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    <subfield code="a">&lt;p&gt;Tetrahedrite-based compounds are considered a promising thermoelectric material. The tetrahedrite-tennantite series, that can be generically expressed as Cu&lt;sub&gt;6&lt;/sub&gt;[Cu&lt;sub&gt;4&lt;/sub&gt;(Fe,Zn)&lt;sub&gt;2&lt;/sub&gt;](Sb,As)&lt;sub&gt;4&lt;/sub&gt;S&lt;sub&gt;13&lt;/sub&gt;, is one of the most abundant sulfosalt minerals in the earth&amp;rsquo;s crust. The Iberian Pyrite Belt (IPB), located in southern Portugal and Spain, is the host of the largest concentration of massive sulfide deposits worldwide, where the tetrahedrite-tennantite series mineral is one of the constituents. In this work we evaluate the effectiveness of combining synthetic tetrahedrite (ST) with tetrahedrite-tennantite ore samples (TTOS) in the mechanochemical synthesis (MCS) process of tetrahedrite-based compounds. The ore samples were collected from two distinct deposits within the Portuguese part of the IPB, the Neves Corvo mine and the abandoned Barrig&amp;atilde;o copper mine. The ST, also produced by MCS, were mixed with the TTOS in different mass ratios ranging from 20-80%. The influence of the chemical composition and phase constitution of the ore samples and of the mixing ratios will be presented in relation to the micro-structural properties of the obtained materials. The results here described are part of a broader study dedicated to the development of energy-harvesting applications based on tetrahedrite. This work is funded by national funds through the FCT &amp;ndash; Funda&amp;ccedil;&amp;atilde;o para a Ci&amp;ecirc;ncia e a Tecnologia, I.P., under the project PTDC/EAM-PEC/29905/2017 (LocalEnergy project, http://localenergy.lneg.pt).&lt;/p&gt;</subfield>
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