Results 41 to 50 of about 6,256 (224)

Avaliação de argilas pura e impregnada com SnO2 como catalisador para a produção de biodiesel

Cerâmica, 2015
ResumoA versatilidade de materiais naturais como as argilas tem chamado a atenção para a sua aplicação em estudos científicos. Neste trabalho foi avaliado o enriquecimento dessas propriedades com a impregnação de SnO2 na superfície desse material, e seu ...
A. M. Neris, D. Araújo, Y. Cavalcante, A. F. F Farias, K. F. Moura, A. A. Cutrin, J. D. S. S. Nascimento, E. Longo, A. G. Souza, I. M. G. Santos   +9 more
doaj   +1 more source

Sintering of Negative and Zero Thermal Expansion Phases in A2M3O12 Family: A Review

physica status solidi (b), Volume 263, Issue 5, May 2026.
This study assesses multiple synthesis methods for A2M3O12 powders, as well as consolidation and sintering routes for preparation of monolithic A2M3O12 ceramics. Correlations between powder features, consolidation, and sintering have been discussed to enable the fabrication of high‐density A2M3O12 monoliths with fine microstructure and improved ...
Marianne D. R. Henriques, Bojan A. Marinkovic   +1 more
wiley   +1 more source

Materiais cerâmicos catalíticos à base de hexa-aluminato de metais alcalino terrosos (Ba e Ca): síntese e análise estrutural

Cerâmica, 2015
ResumoO objetivo desse trabalho é desenvolver catalisadores cerâmicos compostos por hexa-aluminatos de metais alcalinos terrosos (Ca e Ba) - CaAl12O19 e BaAl12O19, respectivamente, na forma de pó cerâmico, por meio dos métodos de síntese Pechini e da ...
L. S. Neiva, C. R. P. B. Borges, M. I. Brasileiro, L. M. Novaes, A. M. Cabral, J. B. L. Oliveira   +5 more
doaj   +1 more source

Nanosized Sodium-Doped Lanthanum Manganites: Role of the Synthetic Route on their Physical Properties

, 2003
In this paper we present the results of the synthesis and characterisation of nanocrystalline La1-xNaxMnO3+delta samples. Two synthetic routes were employed: polyacrylamide-based sol-gel and propellant synthesis.
Balcells L., Balcells L., Boix T., Causa M. T., Coey J. M. D., Douy A, Gupta A., Helman J. S., Herrero E., Horyn R., Hwang H. Y., Li R.-W., Li X.-H., Mahendiran R., Malavasi L., Malavasi L., Mathur N. D., Muori M., Nagata K., Ng-Lee Y., Oseroff S. B., Pechini M. P. U.S., Ritter C., Roy S., Sanchez R. D., Shannon R. D., Singanahally T. A., Spinolo G., Tonejc A. M., Töpfer J., van Roosmalen J. A. M.   +30 more
core   +1 more source

Παρασκευή κεραμικών δοκιμίων LAMOX (La2-xAxMo2-yByO9, όπου x=0.5, 0.3 και Α=Pr, Nd, Gd, Eu, ενώ y=1 και B=W) υψηλής πυκνότητας με μεθόδους Pechini, αντίδραση στερεάς κατάστασης και μηχανοχημική ενεργοποίηση για μελέτες διάχυσης οξυγόνου και αλουμινίου [PDF]

, 2017
Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία.
Katsafadou, Kalliopi, Κατσαφάδου, Καλλιόπη   +1 more
core   +1 more source

Thermistor formation using BaTiO3 powders synthesised by the Pechini method

Ingeniería e Investigación, 2010
Barium titanate (BaTiO3) is a compound of interest in the field of electroceramics which is widely used in the manufacture of capacitors, piezoelectric transducers and resistive devices having a positive temperature coefficient (PTCR) and in manufacturing pyroelectric and optoelectronic devices.
Fernández Perdomo, Claudia P., Rodríguez Páez, Jorge E.   +1 more
openaire   +2 more sources

On the Interaction of the Photovoltaic Response With Ferroelectric and Magnetic Domains: Magnetoelectric Control of the Photovoltaic Response in BiFeO3 Thin Films

Small Methods, Volume 10, Issue 9, 8 May 2026.
This study demonstrates tunable photovoltaic responses in pure, polycrystalline BiFeO3 thin films, controlled by external electric and magnetic fields. By aligning ferroelectric domains and leveraging magnetoelectric coupling, the photogeneration is amplified up to seven times.
Luciano Cardoso Dias, Eduardo Astrath Volnistem, Maurício Mazur, Fernanda Barbieri, Karina Midori Endo, Ana Carolina Ferreira, Mariele Noemi da Silva Diaz, Taiana Gabriela Moretti Bonadio, Ricardo Yoshimitsu Miyahara, Tania Toyomi Tominaga, Gustavo Sanguino Dias, Luiz Fernando Cótica, Ivair Aparecido dos Santos, José Antonio Eiras, Valdirlei Fernandes Freitas   +14 more
wiley   +1 more source

Defect chemistry and transport properties of BaxCe0.85M0.15O3-d [PDF]

, 2004
The site-incorporation mechanism of M3+ dopants into A2+B4+O3 perovskites controls the overall defect chemistry and thus their transport properties. For charge-balance reasons, incorporation onto the A2+-site would require the creation of negatively ...
Espinosa, W. T. P., Haile, S. M., Li, L. P., Wu, J.   +3 more
core  

Enhancing the Reactivity of Dicalcium Silicate Using Aluminum and Sulfur Ions Co‐Doping

Journal of the American Ceramic Society, Volume 109, Issue 5, May 2026.
ABSTRACT Belite‐rich cements are a lower‐energy and lower‐CO2 alternative to Portland cements, but the low hydraulic activity of belite remains a major limitation. This study explores the impact of aluminum and sulfur co‐doping on the structure and hydration of synthetic dicalcium silicate (C2S).
Hyeonseok Jee, Faisal Qadri, Nishant Garg   +2 more
wiley   +1 more source

Auto-combustion synthesis of perovskite-type oxides SrTi1−xFexO3−δ [PDF]

, 2015
A versatile one-pot auto-combustion method for the synthesis of powders of iron-doped strontium titanate, SrTi1−xFexO3−δ, has been developed. The synthesis is optimized by the combined use of EDTA and citric acid as chelating agents, and an appropriate ...
Bouwmeester, H.J.M., Donkelaar, S.F.P. ten, Nijmeijer, A., Ruhl, R., Veldhuis, S.A., Winnubst, A.J.A.   +5 more
core   +2 more sources