A. Castro
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View article: Pressure-Induced Stereochemistry and Lone Pair ( E ) Localization in BiF3: Ellipsoidal EBi 6s2 / EF 2s2 Volumes, Perichoresis, and Phase Transitions
Pressure-Induced Stereochemistry and Lone Pair ( E ) Localization in BiF3: Ellipsoidal EBi 6s2 / EF 2s2 Volumes, Perichoresis, and Phase Transitions Open
This work investigates the high-pressure behavior of BiF3 polymorphs, with emphasis on the stereochemical activity and spatial localization of the 6s² lone electron pair (E) of Bi³⁺and the 2s² Es of fluoride anions. Using density functiona…
View article: Mechanochemically assisted synthesis, inversion degree and magnetization of spinel compounds across the (Zn,Mg)Fe2O4 system for flexible smart devices
Mechanochemically assisted synthesis, inversion degree and magnetization of spinel compounds across the (Zn,Mg)Fe2O4 system for flexible smart devices Open
Magnetic spinel oxides are multifunctional materials used or under consideration for a range of applications across electronics, communication technologies, remediation and health. They can also present high magnetostriction coefficients, …
View article: Insights into the Early Size Effects of Lead‐Free Piezoelectric Ba<sub>0.85</sub>Ca<sub>0.15</sub>Zr<sub>0.1</sub>Ti<sub>0.9</sub>O<sub>3</sub>
Insights into the Early Size Effects of Lead‐Free Piezoelectric Ba<sub>0.85</sub>Ca<sub>0.15</sub>Zr<sub>0.1</sub>Ti<sub>0.9</sub>O<sub>3</sub> Open
Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 O 3 (BCZT) stands out among lead‐free ferroelectric oxides under consideration to replace state‐of‐the‐art high‐sensitivity piezoelectric Pb(Zr,Ti)O 3 , for a range of energy conversion ceramic technologies. H…
View article: Fine-grained high-performance Ba0.85Ca0.15 Zr0.1Ti0.9O3 piezoceramics obtained by current-controlled flash sintering of nanopowders
Fine-grained high-performance Ba0.85Ca0.15 Zr0.1Ti0.9O3 piezoceramics obtained by current-controlled flash sintering of nanopowders Open
[EN] Due to environmental concerns, extensive research has been carried out to develop high-performance lead-free piezoceramics capable of replacing commercial lead-based materials. The lead-free (BaCa)TiO −Ba(ZrTi)O system has emerged as …
View article: Critical JT Gravity
Critical JT Gravity Open
In this paper, we investigate a critical behavior of JT gravity, a model of two-dimensional quantum gravity on constant negatively curved spacetimes. Our approach involves using techniques from random maps to investigate the generating fun…
View article: Coexisting magnetic orders and concomitant Morin-like transition and relaxor behavior in multiferroic Aurivillius Bi4Ti3 − 2xNbxFexO12 compounds
Coexisting magnetic orders and concomitant Morin-like transition and relaxor behavior in multiferroic Aurivillius Bi4Ti3 − 2xNbxFexO12 compounds Open
Aurivillius layered oxides with general formula (Bi2O2)(Am−1BmO3m+1) stand out among room-temperature magnetoelectric multiferroics for their large magnetization. However, despite extensive research, there is an obvious lack of understandi…
View article: Multiferroic Aurivillius Bi<sub>4</sub>Ti<sub>2−<i>x</i></sub>Mn<sub><i>x</i></sub>Fe<sub>0.5</sub>Nb<sub>0.5</sub>O<sub>12</sub> (<i>n</i> = 3) compounds with tailored magnetic interactions
Multiferroic Aurivillius Bi<sub>4</sub>Ti<sub>2−<i>x</i></sub>Mn<sub><i>x</i></sub>Fe<sub>0.5</sub>Nb<sub>0.5</sub>O<sub>12</sub> (<i>n</i> = 3) compounds with tailored magnetic interactions Open
A new series of three-layer Aurivillius oxides containing Fe 3+ and Mn 4+ , argued to be too small for its introduction into the crystal structure, is presented. This is a novel family of multiferroic layered oxides with tailored magnetic …
View article: Ceramic processing and multiferroic properties of the perovskite YMnO <sub>3</sub> ‐BiFeO <sub>3</sub> binary system
Ceramic processing and multiferroic properties of the perovskite YMnO <sub>3</sub> ‐BiFeO <sub>3</sub> binary system Open
The perovskite (1− x )YMnO 3 − x BiFeO 3 binary system is very promising because of its multiferroic end members. Nanocrystalline phases have been recently obtained by mechanosynthesis across the system, and the perovskite structural evolu…
View article: Novel Aurivillius Bi<sub>4</sub>Ti<sub>3−2x</sub>Nb<sub>x</sub>Fe<sub>x</sub>O<sub>12</sub> phases with increasing magnetic-cation fraction until percolation: a novel approach for room temperature multiferroism
Novel Aurivillius Bi<sub>4</sub>Ti<sub>3−2x</sub>Nb<sub>x</sub>Fe<sub>x</sub>O<sub>12</sub> phases with increasing magnetic-cation fraction until percolation: a novel approach for room temperature multiferroism Open
Aurivillius oxides with general formula (Bi2O2)(Am−1BmO3m+1) are being extensively investigated for room-temperature multiferroism and magnetoelectric coupling.
View article: Mechanosynthesis of the Whole Y1−xBixMn1−xFexO3 Perovskite System: Structural Characterization and Study of Phase Transitions
Mechanosynthesis of the Whole Y1−xBixMn1−xFexO3 Perovskite System: Structural Characterization and Study of Phase Transitions Open
Perovskite BiFeO3 and YMnO3 are both multiferroic materials with distinctive magnetoelectric coupling phenomena. Owing to this, the Y1−xBix Mn1−xFexO3 solid solution seems to be a promising system, though poorly studied. This is due to the…
View article: Delicate Balance among Three Ferroic Polymorphic Phases in BiFeO<sub>3</sub>–BiMnO<sub>3</sub>–PbTiO<sub>3</sub>
Delicate Balance among Three Ferroic Polymorphic Phases in BiFeO<sub>3</sub>–BiMnO<sub>3</sub>–PbTiO<sub>3</sub> Open
Phase-change functional responses can be obtained in perovskite solid solutions at structural instabilities involving multiferroic states, a very promising approach for realizing magnetoelectric effects at room temperature. A line of multi…
View article: Insights into the Performance of Magnetoelectric Ceramic Layered Composites
Insights into the Performance of Magnetoelectric Ceramic Layered Composites Open
Finite element analysis is used to simulate the magnetoelectric response of magnetostrictive-piezoelectric NiFe2O4-Bi0.36Pb0.64Sc0.36Ti0.64O3 ceramic two-layer, three-layer, and multilayer structures considering finite geometry and introdu…
View article: Multilayer Ceramic Magnetoelectric Composites with Tailored Interfaces for Enhanced Response
Multilayer Ceramic Magnetoelectric Composites with Tailored Interfaces for Enhanced Response Open
Composite materials consisting of two dissimilar ferroic phases are an excellent alternative to single-phase multiferroics for a wide range of magnetoelectric technologies. In composites with strain-mediated magnetoelectric coupling the re…
View article: Perovskite solid solutions with multiferroic morphotropic phase boundaries and property enhancement
Perovskite solid solutions with multiferroic morphotropic phase boundaries and property enhancement Open
Recently, large phase-change magnetoelectric response has been anticipated by a first-principles investigation of phases in the BiFeO 3 –BiCoO 3 perovskite binary system, associated with the existence of a discontinuous morphotropic phase …
View article: High-sensitivity piezoelectric perovskites for magnetoelectric composites
High-sensitivity piezoelectric perovskites for magnetoelectric composites Open
A highly topical set of perovskite oxides are high-sensitivity piezoelectric ones, among which Pb(Zr,Ti)O3 at the morphotropic phase boundary (MPB) between ferroelectric rhombohedral and tetragonal polymorphic phases is reckoned a case stu…
View article: Mechanosynthesis and multiferroic properties of the BiFeO<sub>3</sub>–BiMnO<sub>3</sub>–PbTiO<sub>3</sub> ternary system along its morphotropic phase boundary
Mechanosynthesis and multiferroic properties of the BiFeO<sub>3</sub>–BiMnO<sub>3</sub>–PbTiO<sub>3</sub> ternary system along its morphotropic phase boundary Open
Mechanosynthesis and analysis of the multiferroicity of new compositions of the BiFeO3–BiMnO3–PbTiO3 ternary system liable to show room-temperature magnetoelectricity.