# A new theory for X-ray diffraction

@article{Fewster2014ANT, title={A new theory for X-ray diffraction}, author={Paul F. Fewster}, journal={Acta Crystallographica. Section A, Foundations and Advances}, year={2014}, volume={70}, pages={257 - 282} }

By considering the scattering distributed throughout space, there is an intensity enhancement at the Bragg angle even when the Bragg condition is not satisfied. This leads to an alternative explanation for the diffraction from powders and small crystals.

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## 13 Citations

Comments on A new theory for X-ray diffraction

- Materials Science, MedicineActa crystallographica. Section A, Foundations and advances
- 2018

This article demonstrates that this theory of X-ray diffraction is in error, and that small crystallites will give rise to scattering at angles of exactly twice the Bragg angle, whatever their orientation.

Estimating the structure factors in X-ray diffraction

- Medicine, ChemistryActa crystallographica. Section A, Foundations and advances
- 2018

The meaning of the structure factor and how it impacts on the determination of structures are reassessed. A route to obtaining the structure factors is presented for several data collection methods…

Bragg scattering from a random potential

- Physics
- 2021

A potential for propagation of a wave in two-dimension is constructed from a random superposition of plane waves around all propagation angles. Surprisingly, despite the lack of periodic structure,…

What is an ‘ideally imperfect’ crystal? Is kinematical theory appropriate?

- Mathematics, MedicineActa crystallographica. Section A, Foundations and advances
- 2016

The diffraction from imperfect crystals and the applicability of kinematical theory are described.

Response to Fraser & Wark’s comments on A new theory for X-ray diffraction

- Chemistry, MedicineActa crystallographica. Section A, Foundations and advances
- 2018

In response to the comments by Fraser & Wark, experimental evidence and an explanation of the new theory in the context of a modified Ewald sphere construction are presented.

Correlating sampling and intensity statistics in nanoparticle diffraction experiments

- Physics
- 2015

In a previous article [Ozturk, Yan, Hill & Noyan (2014). J. Appl. Cryst. 47, 1016–1025] it was shown that the sampling statistics of diffracting particle populations within a polycrystalline ensemble…

Bragg scattering from a weak random potential

- 2021

It is well-known that monochromatic light or matter waves entering a perfectly periodic medium show sharp Bragg scattering into specific angles. Randomly disturbing the perfect lattice positions…

The science is in the data

- Computer Science, MedicineIUCrJ
- 2017

Understanding published research results should be through one’s own eyes and include the raw diffraction data, an option that has recently become viable at various data archives. Preserving and…

Structural studies of hydrated samples of amorphous calcium phosphate and phosphoprotein nanoclusters

- Materials Science, MedicineEuropean Biophysics Journal
- 2015

Advantages of using neutron diffraction and contrast matching to characterize biomaterials are highlighted and the absence of a distinct diffraction pattern from the nanoclusters supports the generally accepted amorphous calcium phosphate structure of the mineral core.

The impact of ultrasonic parameters on the exfoliation of NiFe LDH nanosheets as electrocatalysts for the oxygen evolution reaction in alkaline media

- MedicineUltrasonics sonochemistry
- 2021

Enriched Fe3+ were found on the surface of the exfoliated NiFe LDH and the best OER activity shows 250 mV overpotential at a current density of 10 mA cm−1.

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