Experimental evidence for similar critical behavior of elastic modulus and electric conductivity in porous ceramic materials
Istituto di Acustica "O. M. Corbino”, Consiglio Nazionale
delle Ricerche, via Cassia 1216, I-00189, Rome, Italy
2 Istituto di Ricerche Tecnologiche per la Ceramica, Consiglio Nazionale delle Ricerche, via Granarolo 64, I-48018, Faenza, Italy
Accepted: 18 November 1997
We show experimentally that the elastic modulus of porous ceramics has a critical exponent τ approximately equal to that of conductivity, . This behavior is attributed to the predominance of bond-stretching over bond-bending contribution to the energy and is related to intrinsic properties (like ductility or brittleness) of the homogeneous material.
PACS: 77.65.-j – Piezoelectricity and electrostriction / 05.70.Jk – Critical point phenomena
© EDP Sciences, 1998