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Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific requirements are not imposed on the...
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Designable Multiphase Nanocrystals Based on Phase Rearrangement.

Qipei Sun1, Shiya Chen2, Xuan Huang1

  • 1State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.

Journal of the American Chemical Society
|December 30, 2025
PubMed
Summary
This summary is machine-generated.

Continuous phase control in intermetallic compounds was achieved through phase rearrangement, significantly boosting catalytic performance for the formic acid oxidation reaction (FAOR). This method creates customized nanostructures for enhanced applications.

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Phase engineering is crucial for enhancing catalytic activity.
  • Precise phase control in intermetallic compounds is challenging, limiting phase-dependent catalysis.
  • Developing methods for continuous phase regulation is essential.

Purpose of the Study:

  • To demonstrate continuous phase regulation in intermetallic compounds.
  • To investigate the role of phase rearrangement in selective nanocrystal construction.
  • To understand the phase-dependent behavior during phase transformation.

Main Methods:

  • Mechanistic investigation of phase rearrangement in Pd-Te systems.
  • Utilizing Pd-rich (Pd20Te7) and Te-rich (PdTe2) templates for phase transformation.
  • Analysis of Pb atom incorporation into vacancy sites.

Main Results:

  • Pd-rich templates rearranged to PdTe with Te vacancies filled by Pb, forming Pd-Pb alloy.
  • Te-rich templates rearranged to PdTe with Pd vacancies filled by Pb, forming Pb-Te alloy.
  • The resulting PdTe-PbTe nanostructure showed significantly enhanced formic acid oxidation reaction (FAOR) activity.

Conclusions:

  • Phase rearrangement enables selective phase transformation and customized nanostructure construction.
  • The PdTe-PbTe catalyst achieved superior FAOR activity compared to commercial Pd/C.
  • This work presents a novel strategy for phase-regulation in catalysis.