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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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High-temperature oxide ceramic microwave absorber enabled by thermionic migration mediated by electron

Ruopeng Cui1, Zewen Duan1, Yi Li2

  • 1State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China.

Nature Communications
|October 16, 2025
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Summary

Rare earth zirconate ceramics offer stable, high-temperature microwave absorption up to 1600°C. This breakthrough utilizes thermionic migration for enhanced performance in aerospace stealth applications.

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Area of Science:

  • Materials Science
  • Aerospace Engineering
  • Ceramics

Background:

  • High-temperature microwave-absorbing materials (HTMAMs) are crucial for aerospace stealth.
  • Existing HTMAMs face challenges like magnetic loss degradation and oxidation at high temperatures.

Purpose of the Study:

  • To develop novel, air-stable HTMAMs for extreme environments.
  • To investigate the role of thermionic migration and electron delocalization in microwave absorption.

Main Methods:

  • Synthesis of rare earth zirconate ceramics (Er2Zr2O7/Gd2Zr2O7).
  • Characterization of air stability up to 1600°C.
  • Analysis of permittivity modulation via electron delocalization and lattice disorder.
  • Evaluation of microwave absorption performance and thermal conductivity.

Main Results:

  • Rare earth zirconate ceramics demonstrate excellent air stability up to 1600°C.
  • Oxygen vacancies enhance permittivity through thermionic migration at elevated temperatures.
  • A dual-layer Er2Zr2O7/Gd2Zr2O7 structure achieved ultra-wide bandwidth (8.27 GHz) and strong absorption (-64.61 dB) at 600°C and 1.2 mm thickness.
  • Ultralow thermal conductivity (1.61 W•m⁻¹•K⁻¹) was observed.

Conclusions:

  • Thermionic migration, tuned by electron delocalization, offers a new strategy for designing high-performance, anti-oxidative HTMAMs.
  • The developed materials show promise for structural-functional integration in extreme aerospace environments.
  • This approach advances the design of advanced microwave-absorbing materials.