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Pozzolans01:21

Pozzolans

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Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...
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Enhanced High-Power Performance in PZT Ceramics through Integration of Defect and Grain-Size Engineering.

Zilong Geng1, Mupeng Zheng1, Tianci Ma1

  • 1Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, P. R. China.

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Summary

Achieving stable high-power mechanical quality factor (Qm) in piezoelectric materials is essential. This study combines acceptor doping and fine-grain engineering in lead barium zirconate titanate (PBZT) ceramics to significantly enhance Qm stability under high-power conditions.

Keywords:
PZTacceptor dopinggrain sizehardeninghigh-power

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Area of Science:

  • Materials Science
  • Ceramics Engineering
  • Solid State Physics

Background:

  • The mechanical quality factor (Qm) stability is critical for high-power piezoelectric applications.
  • Acceptor doping enhances piezoelectric hardening but oxygen vacancies can degrade Qm at high power.
  • Developing piezoelectric materials with stable high-power Qm requires addressing domain wall mobility.

Purpose of the Study:

  • To demonstrate an integrated approach for achieving high-power stable Qm.
  • To investigate the combined effects of acceptor doping and dense fine-grain structure on Qm stability.
  • To provide a method for developing advanced high-power piezoelectric materials.

Main Methods:

  • Utilized manganese (Mn) acceptor doping in lead barium zirconate titanate (PBZT) ceramic.
  • Engineered the grain size of the Mn-doped PBZT ceramic.
  • Evaluated the mechanical quality factor (Qm) under varying high-power vibration velocities.

Main Results:

  • Mn doping in PBZT significantly increased Qm by 370% compared to undoped samples.
  • Engineering grain size in Mn-doped PBZT resulted in a more stable domain configuration.
  • The Mn-doped, fine-grained PBZT exhibited slower Qm degradation at high vibration velocities (0.5 m/s and 1.0 m/s).

Conclusions:

  • Combining defect (acceptor doping) and grain-size engineering effectively improves high-power Qm stability.
  • This integrated approach offers a viable strategy for developing high-performance piezoelectric materials.
  • The developed PBZT ceramic shows promise for demanding high-power piezoelectric applications.