How crystals can levitate trains and power the future of energy
In short: From the sudden loss of electrical resistance in superconductors to the light-sensitive power of semiconductors, certain crystals possess extraordinary properties. Discover how these materials, ranging from natural minerals to man-made zeolites, drive modern medical diagnostics, advanced communications, and the global quest for cleaner energy.
The behavior of materials under temperature changes reveals a fascinating spectrum of electrical properties. While metals like copper conduct electricity freely and see their resistance drop as they cool, insulators like mica offer much higher resistance. In 1839, Michael Faraday discovered an intermediate class: semiconductors. Unlike metals, these crystals actually see their resistance decrease as temperatures rise. This unique sensitivity to temperature and light allows semiconductors to serve as the foundation for solar cells, radiation detectors, and infrared cameras.
Beyond semiconductors, some crystals exhibit the profound phenomenon of superconductivity. When cooled sufficiently, these materials lose all electrical resistance entirely. This property holds the potential to revolutionize massive industries, specifically in the realms of transportation and medical diagnostics. Similarly, when engineered with precision, semiconductors can be transformed into efficient lasers, a technology that has seen rapid evolution since the first ruby-based laser was created less than thirty years before the 1987 lecture.
Chemistry also relies on the structural power of crystals through catalysis. Catalysts enable highly efficient chemical conversions, and their composition can vary from metals to insulators. Notable examples include platinum and zeolites—man-made versions of natural minerals. These materials are essential for modern chemical engineering, contributing to advancements in environmental science and the development of more sustainable energy sources.
The study of these materials is not merely academic; crystals and lasers are vital tools in contemporary scientific research, acting as probes for fundamental studies across various disciplines.
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Sources
- Summary by Intellect · source: Catalysts, Semi & Superconductors - John M. Thomas & David Phillips's 1987 Christmas Lectures 3/6
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