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Ultra-high-angle double-crystal X-ray diffractometry (U-HADOX) for determining a change in the lattice spacing:
1Department of Physics, Kyushu University, Fukuoka 812-8581, Japan. hadx6scp@mbox.nc.kyushu-u.ac.jp
Acta Crystallographica. Section A, Foundations of Crystallography
|October 27, 2001
Summary
High-angle double-crystal X-ray diffractometry (HADOX) enhances lattice spacing accuracy to 10^-10. This precise method is ideal for limited-range thermal expansion coefficient measurements.
Area of Science:
- Materials Science
- Crystallography
- Physics
Background:
- High-angle double-crystal X-ray diffractometry (HADOX) is a technique used for precise material analysis.
- Previous applications of HADOX have explored its capabilities in various material characterization scenarios.
Purpose of the Study:
- To re-examine and elucidate the advantages of high-angle double-crystal X-ray diffractometry (HADOX).
- To determine the achievable accuracy in lattice spacing measurements using HADOX at high Bragg angles.
- To assess the suitability of HADOX for measuring thermal expansion coefficients.
Main Methods:
- Utilizing high-angle Bragg diffraction, extending theta up to 89.99 degrees.
- Employing a dispersion-free condition requiring high crystal spacing equality (within 10^-6).
- Integrating the temperature derivative of lattice spacing for wide-range thermal expansion analysis.
Main Results:
- Accuracy in lattice spacing change measurements reaches 10^-9 to 10^-10, proportional to tan theta.
- The stringent dispersion-free condition necessitates precise matching of crystal spacings.
- HADOX is highly accurate for thermal expansion coefficient determination within limited temperature ranges.
Conclusions:
- HADOX offers exceptional accuracy for lattice spacing determination at high angles.
- The method's precision makes it suitable for specific thermal expansion studies.
- Adjusting reference crystal temperature is crucial for wide-range thermal expansion coefficient analysis with HADOX.
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