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Materials Science: Crystal Structure

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Questions and Answers

What characteristic do crystals exhibit due to their physical properties?

Uniformity

Anisotropy (correct)

Homogeneity

Isotropy

Which of the following is a consequence of crystals having different physical properties when measured along different directions?

They have uniform optical properties in all directions

They exhibit identical refractive indices in all directions

They display identical electrical conductivity in all directions

They have varying physical properties in different directions (correct)

What can be inferred about the physical properties of crystals based on the provided information?

They are identical in two directions

They are identical in all directions

They vary depending on the direction of measurement (correct)

They are uniform in all directions except one

In which direction do crystals exhibit uniform physical properties?

In none of the directions Signup and view all the answers

What is a characteristic of crystals that is related to their physical properties?

Anisotropy Signup and view all the answers

What is the primary reason why perfect crystals are not thermodynamically favored?

The presence of thermal energy at temperatures above 0K introduces disorder Signup and view all the answers

What is the effect of increasing the amplitude of thermal vibrations on the interatomic distance in a crystal?

The interatomic distance increases Signup and view all the answers

What is the primary factor that determines the diffusion coefficient of a material?

The thermal energy distribution in the material Signup and view all the answers

What type of defect is characterized by the presence of a vacancy and an interstitial atom in a crystal lattice?

Frenkel defect Signup and view all the answers

What is the effect of grain boundary defects on the mechanical behavior of a material?

The material becomes more brittle Signup and view all the answers

What is the relationship between the linear expansion coefficient and the melting point of a material?

The linear expansion coefficient is inversely proportional to the melting point Signup and view all the answers

What is the primary reason why Schottky defects are more common in ionic crystals than in metallic crystals?

The presence of electrostatic attractions between ions Signup and view all the answers

What is the effect of increasing the temperature on the thermal expansion coefficient of a material?

The thermal expansion coefficient increases Signup and view all the answers

What is the primary factor that determines the concentration of defects in a crystal lattice?