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A Comparative Study of Experimental Configurations in Synchrotron Pair Distribution Function.

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Accurately quantifying tiny nanocrystalline phases and amorphous materials is difficult. This study introduces synchrotron pair distribution function (PDF) analysis to improve resolution in interatomic distance space for complex mixtures.

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C–S–H gelcement samplessynchrotron radiationtotal scattering

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Area of Science:

  • Materials Science
  • Crystallography
  • Nanotechnology

Background:

  • Identifying and quantifying amorphous components and nanocrystalline phases (<3 nm) in crystalline matrices is challenging.
  • These materials are crucial in diverse applications like building materials, glass-ceramics, and alloys.
  • Synchrotron pair distribution function (PDF) analysis is a powerful tool for characterizing local atomic order and quantitative analysis in complex mixtures.

Purpose of the Study:

  • To investigate and discuss the resolution in interatomic distance (real) space for synchrotron PDF data.
  • To evaluate the impact of different experimental configurations and X-ray detectors on PDF data quality.
  • To apply synchrotron PDF analysis for the characterization of challenging materials, including cementitious systems.

Main Methods:

  • Collected synchrotron PDF data at three different beamlines using varied experimental setups and X-ray detectors.
  • Analyzed the resolution in momentum transfer (Q) space (Qmax_ins, Qmax) and interatomic distance (real) space.
  • Utilized a single-phase crystalline nickel standard for thorough calibration and validation.
  • Examined cement-related samples: anhydrous tricalcium silicate, dicalcium silicate, and hydrated pastes.

Main Results:

  • Demonstrated the capability of synchrotron PDF analysis to characterize local atomic order in nanocrystalline phases.
  • Quantified amorphous components and nanocrystalline phases (<3 nm) within complex mixtures.
  • Provided a detailed discussion on the resolution in both Q-space and real space, highlighting the importance of real-space resolution.
  • Successfully analyzed the structure of cementitious materials, including anhydrous and hydrated phases.

Conclusions:

  • Synchrotron PDF analysis offers improved resolution in interatomic distance space, crucial for characterizing materials with nanoscale features.
  • The method is effective for quantitative analysis of complex mixtures containing amorphous and nanocrystalline phases.
  • This approach advances the understanding and characterization of materials like cement, impacting various industrial applications.