Crystalline Defects Overview

Principles

Definition

Crystalline defects is a fundamental concept in materials science and solid-state physics that describes any deviation from the perfect periodic lattice structure of a crystal, investigating how these imperfections, such as point, line, and planar defects, critically influence material properties.

Ontological type

Influence on Properties

Classification

Formation Mechanisms

Key developments

Key Figures

Foundations of Defect Paradigm era

Jean-Baptiste Friedel helped establish a defect-centric view by classifying lattice imperfections and clarifying how dislocations, vacancies, interstitials, and stacking faults govern crystal properties. The combination of Orowan, Polanyi, and Taylor provided the dislocation mechanism of plasticity, linking yield and work hardening to dislocation density and mobility. Cottrell and Bilby advanced the empirical and mechanistic picture by formulating the Cottrell-Bilby model of dislocation atmospheres and pinning, tying solute populations to mechanical strength and plastic flow. Finally, F. R. Nabarro, and later J. P. Hirth with J. Lothe, built a comprehensive theoretical edifice on dislocations and stacking faults, delivering the mathematical framework that underpins defect-dominated crystal behavior and defect-focused crystal growth in this era.

Multi-scale Defect Integration era

D. A. Papaconstantopoulos [1], affiliated with University of Maryland, College Park [3] and University of Virginia [4], helped shape atomistic defect modeling in this era. His key contributions include advancing ab initio, tight-binding, and embedded-atom calculations for copper lattice defects, as demonstrated in the 2001 paper Structural stability and lattice defects in copper: Ab initio, tight-binding, and embedded-atom calculations [7]. Arthur F. Voter [2], with ties to University of California, Los Angeles [5] and California Institute of Technology [6], helped drive multi-scale defect perspectives in this era. His contributions, illustrated by the same copper defect study [7], provided quantitative defect energetics that support quasicontinuum-type bridging of atomistic and mesoscale descriptions, enabling predictive interpretation of defect-driven microstructure evolution.

Atomistic Defect Engineering era

Jörg Neugebauer [1] is associated with Imperial College London [3] and the University of Maryland, College Park [4] in this era. Neugebauer [1] contributed to this era through first-principles defect energetics, exemplified by the 2014 paper First-principles calculations for point defects in solids [7], establishing robust energetics and necessary corrections for accurate defect modeling. Chris G. Van de Walle [2] is associated with the University of California, Santa Barbara [5] and Santa Barbara City College [6] in this era. Van de Walle [2] and the 2014 paper First-principles calculations for point defects in solids [7] helped codify defect energetics and defect-tolerant design strategies essential for this era.