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<p>Nearly 50% of global primary energy consumption is lost as low-temperature heat. λ-Ti<sub>3</sub>O<sub>5</sub> holds promise for waste heat harvesting and reuse; however, achieving reversible phase transitions between its λ and β phases under accessible conditions remains a major challenge. Here, we proposed a simple laser method that incorporates element substitution for sub-minute synthesis (20–60 s) of λ-M<sub><i>x</i></sub>Ti<sub>3-<i>x</i></sub>O<sub>5</sub> (M = Mg, Al, Sc, V, Cr, Mn, or Fe, 0.09 ≤ <i>x</i> ≤ 0.42). In particular, aluminum-substituted λ-Al<sub><i>x</i></sub>Ti<sub>3-<i>x</i></sub>O<sub>5</sub> demonstrated the lowest energy barrier, with a transition pressure of 557 MPa and temperature of 363 K. Notably, compression of the (001) crystal plane could reduce the transition pressure to only 35–40 MPa, enabling the applicability of λ-Al<sub><i>x</i></sub>Ti<sub>3-<i>x</i></sub>O<sub>5</sub> for wide applications in heat recovery and future lunar explorations.</p>

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Sub-minute synthesis and modulation of β/λ-MxTi3-xO5 ceramics towards accessible heat storage

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年3月11日

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  • Pengfei Zhao,
  • Guangshi Li,
  • Xiaolu Xiong,
  • Peng Cheng,
  • Zhongya Pang,
  • Chenteng Sun,
  • Hu Cheng,
  • Caijuan Shi,
  • Xing Yu,
  • Qian Xu,
  • Xingli Zou,
  • Xionggang Lu

摘要

Nearly 50% of global primary energy consumption is lost as low-temperature heat. λ-Ti3O5 holds promise for waste heat harvesting and reuse; however, achieving reversible phase transitions between its λ and β phases under accessible conditions remains a major challenge. Here, we proposed a simple laser method that incorporates element substitution for sub-minute synthesis (20–60 s) of λ-MxTi3-xO5 (M = Mg, Al, Sc, V, Cr, Mn, or Fe, 0.09 ≤ x ≤ 0.42). In particular, aluminum-substituted λ-AlxTi3-xO5 demonstrated the lowest energy barrier, with a transition pressure of 557 MPa and temperature of 363 K. Notably, compression of the (001) crystal plane could reduce the transition pressure to only 35–40 MPa, enabling the applicability of λ-AlxTi3-xO5 for wide applications in heat recovery and future lunar explorations.