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About

The Instituto de Ciencia de Materiales de Madrid (ICMM) is an institute of the Consejo Superior de Investigaciones Cientificas (CSIC) (Spanish National Research Council) founded in December 1986, that belongs to the Area of Science and Technology of Materials, one of the eight Areas in which the CSIC divides its research activities.

 

Our mission is to create new fundamental and applied knowledge in materials of high technological impact, their processing and their transfer to the productive sectors at local, national and European scales (the true value of materials is in their use), the training of new professionals, and the dissemination of the scientific knowledge.

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Forthcoming Events

NOV15/12:00

Irreversibility in closed quantum-many body systems
Stefan Kehrein  read more

NOV20/12:00

Viscoelasticity of cells – implications for adhesion and motility
Andreas Janshoff  read more

NOV29/12:00

Collective Behaviour of Active Particles
Chantal Valeriani  read more

The Polar/Antipolar Phase Boundary of BiMnO3-BiFeO3-PbTiO3: Interplay among Crystal Structure, Point Defects, Multiferroism

Carmen M. Fernández-Posada, Alicia Castro, Jean-Michel Kiat, Florence Porcher, Octavio Peña, Ricardo Jiménez, Miguel Algueró, Harvey Amorín

The ferromagnetic perovskite oxide BiMnO3 is a highly topical material, and the solid solutions it forms with antiferromagnetic/ferroelectric BiFeO3 and with ferroelectric PbTiO3 result in distinctive polar/nonpolar morphotropic phase boundaries (MPBs). The exploitation of such a type of MPBs could be a novel approach to engineer novel multiferroics with phase-change magnetoelectric responses, in addition to ferroelectrics with enhanced electromechanical performance. Here, the interplay among crystal structure, point defects, and multiferroic properties of the BiMnO3–BiFeO3–PbTiO3 ternary system at its line of MPBs between polymorphs of tetragonal P4mm (polar) and orthorhombic Pnma (antipolar) symmetries is reported. A strong dependence of the phase coexistence on thermal history is found: phase percentage significantly changes whether the material is quenched or slowly cooled from high temperature. The origin of this phenomenon is investigated with temperature-dependent structural and physical property characterizations. A major role of the complex defect chemistry, where a Bi/Pb-deficiency allows Mn and Fe ions to have a mixed?valence state, in the delicate balance between polymorphs is proposed, and its influence in the magnetic and electric ferroic orders is defined.

Adv. Func. Mater. 2018

Dynamical mechanical analysis. Young's modulus (Y) as a function of temperature at 40 Hz for a,b) Bi0.4Pb0.6Mn0.4Ti0.6O3and c,d) Bi0.47Pb0.53Fe0.17Mn0.3Ti0.53O3ceramic bars, both with quenching treatment from 750 °C, and measured during two successive heating/cooling cycles. Insets (a,b) show mechanical losses (tan δ) as a function of temperature. e) Successive thermal cycles between room temperature and an increasingly higher temperature for the Bi0.47Pb0.53Fe0.17Mn0.3Ti0.53O3ceramic with quenching.

ICMM-2018 - Sor Juana Inés de la Cruz, 3, Cantoblanco, 28049 Madrid, Spain. Tel: +34 91 334 9000. info@icmm.csic.es