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Crystal structure: Quiz

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Question 1: What does the following picture show?

  Highlighted image of surface of a colloidal crystal. Emphasis on microstructural defects to illustrate the defect/domain morphology typical of an elemental crystal.
  Dense crystallographic planes
  Insulin crystals.
  Planes with different Miller indices in cubic crystals

Question 2: There are four different orientations of the ________ layers.
Close-packing of spheresSphere packingKepler conjectureGeometry

Question 3: Polymorphism can potentially be found in many crystalline materials including polymers, minerals, and metals, and is related to ________, which refers to elemental solids.
IronCarbonAllotropyOxygen

Question 4: The two ________ that are encountered at normal pressure and temperature, α-tin and β-tin, are more commonly known as gray tin and white tin respectively.
OxygenAllotropyCarbonIron

Question 5: A crystal's structure and symmetry play a role in determining many of its physical properties, such as cleavage, electronic ________, and optical transparency.
Muffin-tin approximationAtomic orbitalFree electron modelElectronic band structure

Question 6: Gray tin has no metallic properties at all, is a dull-gray powdery material, and has few uses, other than a few specialized ________ applications.
SemiconductorCondensed matter physicsQuantum mechanicsPhysics

Question 7: So, in this common case, the Miller indices (ℓmn) and [ℓmn] both simply denote normals/directions in ________.
Spherical coordinate systemParabolic coordinatesCylindrical coordinate systemCartesian coordinate system

Question 8: They are similar to but not quite the same as the seven crystal systems and the six ________.
Crystal systemSpace groupMonoclinic crystal systemCubic crystal system

Question 9: What does the following picture show?

  Planes with different Miller indices in cubic crystals
  Planes with different Miller indices in cubic crystals
  SEM micrograph of surface of a colloidal crystal. Structure and morphology consists of ordered crystallites, grains or domains of particles as well as interdomain lattice defects in the form of grain boundaries.
  HCP lattice (left) and the fcc lattice (right).

Question 10: Twenty of the 32 crystal classes are so-called ________, and crystals belonging to one of these classes (point groups) display piezoelectricity.
PiezoelectricityMicrophoneQuartzLead zirconate titanate







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