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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...

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Updated: Jun 19, 2025

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

Published on: February 27, 2017

Superstructure reflections in tilted perovskites.

Richard Beanland¹, Robin Sjökvist¹

¹Department of Physics, University of Warwick, Coventry CV4 7AL, UK.

Acta Crystallographica. Section A, Foundations and Advances

|July 26, 2024

Summary

This summary is machine-generated.

Superstructure reflections in tilted perovskites can be predicted using a novel method based on distortion modes. This approach simplifies the analysis of electron diffraction patterns for perovskite materials.

Keywords:

electron diffraction octahedral tilting perovskites structure factors

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Area of Science:

Crystallography
Materials Science
Solid-State Chemistry

Background:

Superstructure reflections in tilted perovskites are observable in diffraction patterns.
These reflections are typically calculated using crystallographic software.

Purpose of the Study:

To present a new method for predicting superstructure reflections in perovskites.
To demonstrate how distortion modes can be used to derive conditions for superstructure reflection presence.

Main Methods:

Modeling perovskite structure distortion as a perturbation of the prototype structure.
Utilizing the structure-factor equation to derive Boolean conditions.

Main Results:

The structure-factor equation, when applied to distorted perovskites, yields Boolean conditions for superstructure reflections.
This method provides a direct link between distortion modes and the presence of specific reflections.

Conclusions:

The proposed method offers a potentially advantageous approach for analyzing electron diffraction patterns of perovskites.
This crystallographic approach simplifies the prediction and understanding of superstructure reflections.