Acoustic emission avalanches during compression of granular manganites
Soto-Parra, Daniel Enrique
Botello Zubiate, Maria Eugenia
Matutes Aquino, José Andrés
"We have studied acoustic emission (AE) during compression of La0.8Ca0.28Sr0.08MnO2.7 manganites with different microstructures obtained by selected synthesis techniques. In ceramic samples with large grains obtained by a solid-state method, avalanche criticality is confirmed when grain fracture is the AE dominant mechanism. In samples synthesized by means of micro-wave and sol-gel techniques, grains are much smaller and the AE is mainly originated from friction effects associated with relative displacement of grains during deformation. In this case, significant deviations from avalanche criticality have been detected. Published by AIP Publishing."
PublisherAmerican Institute of Physics