Multiferroic bismuth ferrite-based materials for multifunctional applications: Ceramic bulks, thin films and nanostructures

Received January 7, 2011; Revised April 19, 2011 The Bilbao Crystallographic Server is a web site with crystallographic databases and programs available online (www.cryst.ehu.es). It has been operating for more than ten years and new applications are being added regularly. The programs available on the server do not need a local installation and can be used free of charge. The server gives access to general information related to crystallographic symmetry groups (generators, general and special positions, maximal subgroups, Brillouin zones, etc.). Apart from the simple tools for retrieving the stored data, there are programs for the analysis of group-subgroup relations between space groups. There are also software package studying specific problems of solid-state physics, structural chemistry and crystallography.

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Crystallography online by the Bilbao Crystallographic Server

The development of materials is one of the driving forces to accelerate modern scientific progress and technological innovation. Machine learning (ML) technology is rapidly developed in many fields and opening blueprints for the discovery and rational design of materials. In this review, we retrospected the latest applications of ML in assisting perovskites discovery. First, the development tendency of ML in perovskite materials publications in recent years was organized and analyzed. Second, the workflow of ML in perovskites discovery was introduced. Then the applications of ML in various properties of inorganic perovskites, hybrid organic–inorganic perovskites and double perovskites were briefly reviewed. In the end, we put forward suggestions on the future development prospects of ML in the field of perovskite materials.

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Machine learning for perovskite materials design and discovery

Performance Enhancement of Flexible Piezoelectric Nanogenerator via Doping and Rational 3D Structure Design For Self‐Powered Mechanosensational System

Advanced perovskite anodes for solid oxide fuel cells: A review

Influence of processing conditions on the grain growth and electrical properties of barium zirconate titanate ferroelectric ceramics

In the present work, structural, dielectric and ferroelectric properties of barium zirconate titanate ferroelectric ceramics have been investigated. The specimens were synthesized using a solid state reaction technique. The XRD analysis reveals that the synthesized compound was formed with no secondary phases. As the sintering temperature increases from 1,200 to 1,300 °C, the average grain size is observed to increase from ~0.39 to ~6.15 μm. The dielectric measurements as a function of temperature show a decrease in Curie temperature (TC) on increasing the sintering temperature. The decrease in Curie temperature is attributed to the substitution of Zr+4 whose ionic radius is larger than Ti+4. A large increase in the dielectric constant with the increase in grain size is observed. The remanent polarization is also observed to increase with the increase in grain size.

Effect of sintering temperature on the grain growth and electrical properties of barium zirconate titanate ferroelectric ceramics

Dielectric behavior of (1 − x) Ba Zr0.025Ti0.975O3–(x) BiFeO3 solid solutions

Tuning the electronic band gaps of semiconductors is at the core of current research on optoelectronic materials and devices. For ZnO, many studies have tried to enhance the band gap by chemical substitution, but lattice mismatch often thwarts that approach. Instead, this study looks to dimensional reduction. Experiments and first-principles calculations reveal that not only the thickness but also the $o\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}n$ of a film can affect quantum confinement, and thus ZnO's optoelectronic properties. A suitably oriented and thinned film can boost the band gap to the ``solar-blind'' region above 4.6 eV, opening up a wide range of possibilities for applications.

Priyanka A. Jha

Papers

Influence of processing conditions on the grain growth and electrical properties of barium zirconate titanate ferroelectric ceramics

Effect of sintering temperature on the grain growth and electrical properties of barium zirconate titanate ferroelectric ceramics

Dielectric behavior of (1 − x) Ba Zr0.025Ti0.975O3–(x) BiFeO3 solid solutions

Band-Gap Engineering in ZnO Thin Films: A Combined Experimental and Theoretical Study

Large polaron hopping phenomenon in lanthanum doped strontium titanate