Combinatorial Bulk Ceramic Magnetoelectric Composite Libraries of Strontium Hexaferrite and Barium Titanate.
Summary of "Combinatorial Bulk Ceramic Magnetoelectric Composite Libraries of Strontium Hexaferrite and Barium Titanate."
Bulk ceramic combinatorial libraries were produced via a novel, high-throughput (HT) process, in the form of polycrystalline strips with a gradient composition along the length of the library. Step gradient ceramic composite libraries with 10 mol % steps of SrFe(12)O(19)-BaTiO(3) (SrM-BT) were made and characterized using HT methods, as a proof of principle of the combinatorial bulk ceramic process, and sintered via HT thermal processing. It was found that the SrM-BT libraries sintered at 1175 °C had the optimum morphology and density. The compositional, electrical and magnetic properties of this library were analyzed, and it was found that the SrM and BT phases did not react and remained discrete. The combinatorial synthesis method produced a relatively linear variation in composition. The magnetization of the library followed the measured compositions very well, as did the low frequency permittivity values of most compositions in the library. However, with high SrM content of ≥80 mol %, the samples became increasingly conductive, and no reliable dielectric measurements could be made. Such conductivity would also greatly inhibit any ferroelectricity and magnetoelectric coupling with these composites with high levels of the SrM hexagonal ferrite.
Affiliation
Department Engenharia Cerâmica e do Vidro/CICECO, Universidade de Aveiro , Campus Universitário de Santiago, Aveiro 3810-193, Portugal.
Journal Details
This article was published in the following journal.
Name: ACS combinatorial science
ISSN: 2156-8944
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22676556
- DOI: http://dx.doi.org/10.1021/co300036m
Medical and Biotech [MESH] Definitions
Strontium Isotopes
Stable strontium atoms that have the same atomic number as the element strontium, but differ in the atomic weight. Sr-84, 86, 87, and 88 are the stable strontium isotopes.
Strontium Radioisotopes
Unstable isotopes of strontium that decay or disintegrate spontaneously emitting radiation. Sr 80-83, 85, and 89-95 are radioactive strontium isotopes.
Combinatorial Chemistry Techniques
A chemistry-based technology in which sets of reactions, for solution or solid-phase synthesis, are used to create molecular libraries for analysis of compounds on a large scale.
Click Chemistry
Organic chemistry methodology that mimics the modular nature of various biosynthetic processes. It uses highly reliable and selective reactions designed to "click" i.e., rapidly join small modular units together in high yield, without offensive byproducts. In combination with COMBINATORIAL CHEMISTRY TECHNIQUES, it is used for the synthesis of new compounds and combinatorial libraries.
Libraries, Digital
Libraries in which a major proportion of the resources are available in machine-readable format, rather than on paper or MICROFORM.
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