Fast microwave-assisted synthesis of Li-stuffed garnets and insights into Li diffusion from muon spin spectroscopy

Lithium-stuffed garnets attract huge attention due to their outstanding potential as solid-state electrolytes for lithium batteries. However, there exists a persistent challenge in the reliable synthesis of these complex functional oxides together with a lack of complete understanding of the lithium-ion diffusion mechanisms in these important materials. Addressing these issues is critical to realizing the application of garnet materials as electrolytes in all solid-state lithium-ion batteries. In this work, a cubic phase garnet of nominal composition Li6.5Al0.25La2.92Zr2O12 is synthesized through a microwave-assisted solid-state route for the first time, reducing considerably the reaction times and heating temperatures. Lithium-ion diffusion behavior is investigated by electrochemical impedance spectroscopy (EIS) and state-of-art muon spin relaxation (μSR) spectroscopy, displaying activation energies of 0.55 ± 0.03 eV and 0.19 ± 0.01 eV respectively. This difference arises from the high inter-grain resistance, which contributes to the total resistance in EIS measurements. In contrast, μSR acts as a local probe providing insights on the order of the lattice, giving an estimated value of 4.62 × 10−11 cm2 s−1 for the lithium diffusion coefficient. These results demonstrate the potential of this lithium-stuffed garnet as a solid-state electrolyte for all-solid state lithium-ion batteries, an area of growing interest in the energy storage community

I, la loza quebrada de relleno de bóvedas

En este artículo se ofrece por vez primera una tipología de 212 formas de cerámicas comunes producidas en Triana (Sevilla), Marchena y Carmona entre los siglos XV a XVIII. Los datos proceden de las colecciones de vasos defectuosos rescatados de los rellenos de bóvedas de edificios. Se garantizan con ello lugares de producción exactos y cronologías precisas para series de vasos completos.This article offers the first typology of 212 shapes from 15th to 18th centuries Triana (Sevilla), Marchena and Carmona coarse ware. The information has been recorded from the interior of a large number of well dated vaulting roofs. So that it is possible to determine exact production sites and precise chronologies of complete vessels series

Georreferencias de la planimetría e imágenes digitales en Arqueología: Aplicación en la necrópolis de "La Cruz del Negro" (Carmona, Sevilla)

Partiendo de los estudios realizados en la necrópolis tartésica de la "Cruz del Negro" se expone la aplicación ala investigación arqueológica de los principios teóricos básicos para georreferenciar elementos espaciales e imágenes digitales. Se muestran las correcciones geométricas efectuadas sobre el registro planimétrico del lugar desde las primeras intervenciones hasta las últimas prospecciones magnéticas.From the studies accomplished in the "Cruz del Negro" tartesian burial site, the application to the archaeological research of the basic theoretical principles necessary for geo-referencing spatial elements and digital images is exposed. The geometric corrections made on the plannimetric record of the site from the first interventions up to the last magnetic surveys are shown

Tabulae lusoriae in Hispalis

Durante el transcurso de las excavaciones arqueológicas realizadas en la plaza de la Encarnación (Sevilla) fueron halladas cinco losas de pavimento de piedra con diversas tabulae lusoriae incisas. El objetivo de este artículo es estudiarlas y analizarlas, teniendo en cuenta sus paralelos con otras ciudades peninsulares y extrapeninsulares, así como los últimos estudios que existen sobre los juegos de mesa o de tablero romanosDuring the course of archaeological excavations in Plaza de la Encarnación (Sevilla, Spain) were found five paving stones labs with several incised tabulae lusoriae. The aim of this paper is to study and analyze them, taking into account theirs parallels with others peninsular and mainland cities, as well as recent studies that exist about Roman games or boardHistoriografía y Patrimonio Andaluz PAI HUM 402El Taller de ORDO: Representaciones gráficas de la influencia y el poder de las élites en la pars occidentalis del Imperio Romano HAR 2011-29108-c04-0