quasicrystal
C2 (Proficient)Highly technical/scientific. Almost exclusively used in academic papers, advanced textbooks, and specialist discussions in chemistry, physics, and materials engineering.
Definition
Meaning
A solid structure that is ordered but not periodic; it has a pattern that does not repeat in a regular, predictable way like a standard crystal.
In materials science and physics, a quasicrystal possesses a mathematically precise, long-range order but with a symmetry (like fivefold or tenfold rotational symmetry) forbidden in traditional crystallography. Its discovery challenged fundamental notions of how matter could be arranged.
Linguistics
Semantic Notes
The term specifically denotes a state of matter with non-periodic ordering. It is a hyponym of 'solid' and stands in contrast to 'crystal' (periodic) and 'amorphous solid' (like glass, lacking long-range order).
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Potential minor variations in the pronunciation of the prefix 'quasi-'.
Connotations
Identical technical connotations. The word carries the weight of a Nobel Prize-winning discovery (awarded to Dan Shechtman in 2011).
Frequency
Extremely low frequency in general discourse in both regions, limited to identical specialist contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
The team synthesised [a new quasicrystal].[Quasicrystals] exhibit [unusual properties].[This alloy] can form [into a quasicrystal] under specific conditions.Vocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Virtually never used. Might appear in highly technical investment reports on advanced materials or nanotechnology startups.
Academic
Primary context. Used in research papers, theses, and lectures on solid-state physics, crystallography, and materials science.
Everyday
Extremely rare. Might be mentioned in popular science articles or documentaries about Nobel Prizes or material science breakthroughs.
Technical
The core context. Precise descriptions of atomic arrangement, diffraction patterns, and thermodynamic stability.
Examples
By Part of Speech
adjective
British English
- The quasicrystalline phase was metastable.
- They observed quasicrystal growth.
American English
- The quasicrystalline alloy exhibited high hardness.
- Quasicrystal formation requires rapid cooling.
Examples
By CEFR Level
- Scientists found a new material called a quasicrystal.
- Unlike regular crystals, quasicrystals have patterns that never exactly repeat themselves.
- The discovery of quasicrystals necessitated a redefinition of the very term 'crystal' in the International Union of Crystallography.
- High-resolution TEM imaging confirmed the existence of an icosahedral quasicrystal with forbidden tenfold rotational symmetry in the rapidly solidified alloy.
Learning
Memory Aids
Mnemonic
Think: 'QUASI' (almost, but not quite) + 'CRYSTAL' (ordered solid). It's almost a crystal, but its pattern never quite repeats itself perfectly.
Conceptual Metaphor
A PENROSE TILING OF ATOMS. Like the famous Penrose tiling which covers a plane with a non-repeating pattern of two tile shapes, a quasicrystal arranges atoms in a similar, orderly yet non-repeating fashion.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate literally as 'квазикристалл' without understanding it's a specific scientific term, not just any 'almost-crystal'.
- Beware of false friends: 'кристалл' implies periodicity; 'quasicrystal' explicitly denies strict periodicity.
Common Mistakes
- Misspelling as 'quasi-crystal' (the hyphen is sometimes used but the solid form 'quasicrystal' is standard).
- Confusing it with a 'polycrystal' (which is an aggregate of many small periodic crystals).
- Assuming it is simply a disordered or amorphous material.
Practice
Quiz
What is the defining characteristic of a quasicrystal?
FAQ
Frequently Asked Questions
Both. They were first synthesised in the laboratory in 1982. The first natural quasicrystal was identified in 2009 in a meteorite sample.
Traditional crystallography stated that crystals could only have 1, 2, 3, 4, or 6-fold rotational symmetry. Quasicrystals exhibit 'forbidden' symmetries like 5-fold or 10-fold.
Yes, though applications are developing. Their unusual properties (e.g., low friction, high hardness, low thermal conductivity) make them promising for non-stick coatings, surgical instruments, and thermal barrier coatings.
Dan Shechtman observed the first quasicrystal in an aluminium-manganese alloy in 1982. His discovery was initially met with great skepticism but was later validated, earning him the Nobel Prize in Chemistry in 2011.