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Strength and Heat of Hydration01:29

Strength and Heat of Hydration

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The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
228

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High-Entropy CeNbO4+δ-Based Ceramics with Ultrahigh Comprehensive Thermosensitive Performances.

Yafei Liu1,2, Ruifeng Wu1,2, Hao Sun1

  • 1State Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics & Chemistry of CAS, Urumqi 830011, China.

ACS Applied Materials & Interfaces
|May 24, 2024
PubMed
Summary
This summary is machine-generated.

High-entropy strategy enhances cerium niobium oxide (CeNbO4+δ) ceramics for high-temperature sensors. This breakthrough achieves ultrahigh stability and accuracy, overcoming critical limitations in thermosensitive ceramic development.

Keywords:
high-entropy ceramicsmicrostructureoxygen nonstoichiometricthermosensitive ceramicsultrahigh-density dislocations

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Area of Science:

  • Materials Science
  • Ceramic Engineering
  • Sensor Technology

Background:

  • High-temperature sensors require negative temperature coefficient (NTC) thermosensitive ceramics.
  • Current NTC ceramics face challenges in achieving ultrahigh stability and accuracy at high temperatures.
  • Temperature-dependent oxygen nonstoichiometry limits the performance of existing thermosensitive ceramics.

Purpose of the Study:

  • To develop advanced NTC thermosensitive ceramics with improved stability and accuracy for high-temperature sensors.
  • To address the critical bottleneck of performance limitations in current thermosensitive ceramic materials.
  • To explore a novel high-entropy strategy for designing superior ceramic materials.

Main Methods:

  • Implemented a high-entropy strategy in CeNbO4+δ-based ceramics.
  • Introduced a 'cation valence self-equilibrium' system with redox couple compensation.
  • Enhanced configurational entropy to generate ferroelastic domains and increase dislocation density (>10^10 mm^-2).

Main Results:

  • Achieved extreme temperature measurement accuracy (R² = 999.98‰, RSS = 0.011).
  • Demonstrated high-temperature stability with minimal resistance change (ΔR/R0 = 0.23% after 1000 h aging at 873 K).
  • Realized ultrahigh dislocation density, optimizing thermosensitive performance.

Conclusions:

  • High-entropy CeNbO4+δ-based ceramics exhibit breakthrough comprehensive performance for high-temperature applications.
  • The 'cation valence self-equilibrium' system effectively solves oxygen nonstoichiometry issues.
  • This approach provides a viable pathway for designing advanced thermosensitive materials for next-generation sensors.