Ceramics

  • Article
    | Open Access

    The contribution of vibrations to the stability of high-entropy ceramics is still controversial. Here the authors computationally integrate disorder parameterization, phonon modelling, and thermodynamic characterization to investigate the role of vibrations to the stability of high-entropy carbides.

    • Marco Esters
    • , Corey Oses
    •  & Stefano Curtarolo
  • Article
    | Open Access

    Although polarized Raman microscopy is sensitive to orientation changes, quantitative information has been missing. Here, the authors use simultaneous registration of multiple Raman scattering spectra obtained at different polarizations and show quantitative orientation mapping

    • Oleksii Ilchenko
    • , Yuriy Pilgun
    •  & Anja Boisen
  • Article
    | Open Access

    Cracks propagate preferentially along grain boundaries, but what happens exactly at the atomic scale remains unclear. Here, the authors combine atomic-scale observations and first-principles calculations to show local coordination chemistry at a dopant-segregated alumina grain boundary core dictates the atomic bond-breaking path.

    • Shun Kondo
    • , Akihito Ishihara
    •  & Yuichi Ikuhara
  • Article
    | Open Access

    Sintering hexagonal boron nitride until it is more than 96% dense remains a challenge. Here, the authors mix cubic boron nitride particles into hexagonal boron nitride flakes and sinter the combined powders to obtain dense hexagonal boron nitride ceramics with significantly increased strength.

    • Haotian Yang
    • , Hailiang Fang
    •  & Jianlin Li
  • Article
    | Open Access

    Highly ordered and compositionally complex ceramics are prone to disordering under irradiation, but exactly how is unclear. Here, the authors use high resolution microscopy to directly image the order-to-disorder phase transformations in Ti3AlC2 into otherwise unattainable solid solutions.

    • Chenxu Wang
    • , Tengfei Yang
    •  & Yugang Wang
  • Article
    | Open Access

    Little is known about diffusion along metal/ceramic interfaces even though it controls the physical behavior and lifetimes of many devices (including batteries, microelectronics, and jet engines). Here, the authors show that diffusion along a nickel/sapphire interface is abnormally fast due to nickel vacancies and generalise their findings to a wide-range of metal/ceramic systems.

    • Aakash Kumar
    • , Hagit Barda
    •  & David J. Srolovitz
  • Article
    | Open Access

    Sandwich structures such as corrugated cardboard offer low weight and high bending stiffness, but they are difficult to produce at the nanoscale. Here, the authors combine webbing and perforation to produce alumina ‘nanocardboard’ with ultralow areal density that recovers without damage from extreme deformation.

    • Chen Lin
    • , Samuel M. Nicaise
    •  & Igor Bargatin
  • Article
    | Open Access

    The development of potassium-ion batteries requires cathode materials that can maintain the structural stability during cycling. Here the authors have developed honeycomb-layered tellurates K2M2TeO6 that afford high ionic conductivity and reversible intercalation of large K ions at high voltages.

    • Titus Masese
    • , Kazuki Yoshii
    •  & Masahiro Shikano
  • Article
    | Open Access

    Fabricating complex nanodevices requires joining techniques such as welding, common for metals but still out of reach for ceramics. Here the authors use MgO as a solder in a transmission electron microscope with a CO2 atmosphere to weld ceramic nanowires, and show their novel technique can also weld bulk ceramics.

    • Liqiang Zhang
    • , Yushu Tang
    •  & Jianyu Huang
  • Article
    | Open Access

    Space-charges in polycrystalline materials can drive segregation of dopants, however an in-depth understanding of this process is still missing. Here, the authors show that in polycrystalline perovskites the space-charge segregation and interfacial structure are nearly identical irrespective of the interface type.

    • Hye-In Yoon
    • , Dong-Kyu Lee
    •  & Sung-Yoon Chung
  • Article
    | Open Access

    To improve mechanical properties in ceramics through grain boundary engineering, precise mechanical characterization of individual boundaries is vital yet difficult to achieve. Here authors perform experiments using an in situ scanning electron microscopy based double cantilever beam test, allowing to directly view and measure stable crack growth in silicon carbide.

    • Giorgio Sernicola
    • , Tommaso Giovannini
    •  & Finn Giuliani
  • Article
    | Open Access

    Hypersonic and aerospace applications motivate development of materials with improved resistance against ablation and oxidation at high temperatures. Here authors demonstrate a quaternary carbide, where sealing by surface oxides, slow oxygen diffusion and a graded structure yield improved ablation resistance over established ceramics.

    • Yi Zeng
    • , Dini Wang
    •  & Ping Xiao
  • Article
    | Open Access

    Shaping ceramics into complex forms is a formidable goal. Here, the authors present an approach to self-shaping ceramics, inspired by self-folding processes in plants, in which the ceramic microstructure is embedded with aligned platelets that control the orientation of heat-induced shrinkage.

    • Fabio L. Bargardi
    • , Hortense Le Ferrand
    •  & André R. Studart
  • Article
    | Open Access

    It is suggested that the optical and mechanical properties of transparent ceramics become very favourable if they can be synthesized as nanocrystals. Here, the authors report direct conversion of bulk glass starting material to pore-free nano-polycrystalline silicate garnet at high pressure and temperature.

    • T. Irifune
    • , K. Kawakami
    •  & T. Shinmei
  • Article
    | Open Access

    Materials that can store and release heat on demand are of use for energy storage applications. Here, the authors discover a ceramic material that can reversibly store energy from heat, light or electricity and release this energy as heat through the application of pressure.

    • Hiroko Tokoro
    • , Marie Yoshikiyo
    •  & Shin-ichi Ohkoshi