Survey of new materials by solid state synthesis under external fields: high-pressure synthesis and microwave processing of inorganic materials

Abstract

The most common preparative method for inorganic solids is solid state reaction of constituent materials. Since the solid state reaction is usually performed at high temperature for a long heating duration, almost all the products are thermodynamically stable. During the long history of solid state chemistry and materials science, an enormous number of binary and ternary equilibrium phase diagrams were constructed and it seems like there is no hope to find out new materials those exhibit fascinating functionality. By applying external fields to solid state reaction systems, however, it has become possible to synthesize new compounds those do not exist in the equilibrium phase diagrams. In this article, synthesis of inorganic materials under high-pressure and microwave electromagnetic fields is reviewed. The scope of this review covers, but is not limited to, effects of external fields (high-pressure and microwave electromagnetic wave) on the formation of new compounds and structures those can not be prepared by conventional synthetic routes.

Three-Dimensional Finite Element Numerical Simulation and Analysis of Solid-State Processing of Metal Material

“…erefore, scholars have conducted a lot of research studies on the numerical simulation of metal material's solid-state processing and have obtained many research results [8].…”

Synthesis of functional ceramics by microwave non-equilibrium processing

“…Nonequilibrium reaction fields have the potential to synthesize functional materials with metastable phases and structures. 3) Furthermore, energy-efficient processes can be created by constructing synthetic pathways that can help address social issues such as carbon neutrality.…”

Noncentrosymmetric Nowotny Chimney Ladder Ferromagnet Cr4Ge7 with a High Curie Temperature of ∼207 K

“…These results indicate that NCL compounds may offer a unique platform to study the complex magnetic exchanges that favor intriguing topological spin textures. A very recent study on another high-pressure synthesized noncentrosymmetric ferromagnet Cr 4 Ge 7 suggested a defective disilicide-type structure and a T C of ∼270 K. − However, the insufficient experimental data and analysis make an understanding of this intriguing phase obscure.…”