Ceramic‐based dielectric metamaterials

Abstract

Dielectric metamaterials based on ceramics have attracted considerable interest in the past few years owing to their low dielectric loss, simple structure, excellent multifield tunability, and good environmental adaptability. They are considered to be promising alternative to metal‐based metamaterials and can lead to a new strategy for the development of passive devices. In this review, the recent progress of ceramic‐based dielectric metamaterials in electromagnetic applications, energy applications, non‐Hermitian systems, and natural materials with near‐zero or negative refraction are summarized. The design principle and mechanism, as well as manufacturing technologies, are also introduced, and the current development trend of ceramic‐based dielectric metamaterials are proposed.

Donor–acceptor modified ixiolite structural ceramics for millimeter-wave broadband metamaterial devices

“…in different extreme environments and have great prospects in future millimeter-wave applications. 38,87,88…”

“…Meanwhile, with their low dielectric loss, good environmental compatibility and multi-field tunability, they are considered as promising alternatives to metal-based metamaterials and could bring new strategies for the design and development of passive devices. 37,38 Since the loss for them and related devices was mainly attributed to dielectric ceramics, it was crucial to explore low-loss ceramic systems for high-performance ceramic-based dielectric metamaterials.…”

Biomimetic formation of fluorapatite nanorods in confinement and the opposite effects of additives on the crystallization kinetics

“…During the billions of years of biological evolution and natural selection, in order to resist and adapt to environmental changes, biological systems have evolved many biominerals, referring to hard tissue such as teeth, bones and shells, with intricate structures and excellent performances. 1,2 In contrast to many artificial synthetic processes that require high temperature or even high pressure, 3,4 biominerals are often produced under environmentally benign conditions. Inspiration from nature plays an important role in designing advanced materials.…”

Microstructure characterization of high‐pressure induced texture in fully densified zirconium diboride ceramics

“…Promising applications that make full advantage of these remarkable features include high‐temperature electrodes, 4 cutting tools, rocket propulsion systems, and the leading edges of hypersonic aerospace vehicles 5 . However, because of the high melting point and inherently strong bonds, it is rather difficult to obtain fully densified single‐phase ZrB 2 bulks 6–8 …”

“…5 However, because of the high melting point and inherently strong bonds, it is rather difficult to obtain fully densified single-phase ZrB 2 bulks. [6][7][8] Sintering under high pressure has been proved to be an effective approach to obtain denser advanced ceram-ics. Moreover, it is proposed that plastic deformation is one of the dominant densification mechanisms in highpressure-assisted sintering.…”