Israeli scientists found quasicrystals and won the 2011 Nobel Prize in chemistry alone. All known quasicrystals are intermetallics. The composition and structure of quasicrystals are still under study. It is found that the quasicrystals composed of aluminum copper iron chromium have low friction coefficient, high hardness, low surface energy and low heat transfer, and are being developed as coatings for frying pans; Al65Cu23Fe12 is very wear-resistant and has been developed as the coating of high temperature arc nozzle. The following statement is correct
A. The crystals formed by ionic compounds must have metal elements B. The covalent compounds must have no non-polar bonds
C. Alloy is pure D. Quasicrystals can be developed into new materials
The standard answer is D
The rumor came from the 7th multiple choice question of the mid-term chemistry test paper of the third (first) term of the joint examination of Jinlan Cooperative Organization in Ningbo, Zhejiang Province in the 2012-2013 academic year
Reputation: of course, the alloy can be pure. For example, all known quasicrystals are metal intermetallics [4], which just shows that the above-mentioned quasicrystal alloy Al65Cu23Fe12 is a fixed metal intermetallic compound (intermetallic forming compound) [5], that is, pure. The misconception that alloy is a mixture should not be used as a knowledge point for dissemination or for so-called exercises. For example, the statement that "alloys belong to mixtures" in the following articles has a fundamental scientific error and should not be misled:
Mastering the Key Points of the High School Entrance Examination of "Metals and Metal Materials", issued by Math, Physics and Chemistry for Middle School Students (Junior High School Edition, High School Entrance Examination Edition), Issue 10, 2013
