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MATSE Lesson 11 Questions and answers
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MATSE Lesson 11 Questions and answers
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Solution 2024/2025Pepper
MATSE Lesson 11 Questions and answers
Cations ANS✔✔ positively charged ions, metallic. Smaller than their counterpart due to a lack of electron(s)
Anions ANS✔✔ negatively charged ions, nonmetallic
Cation-Anion Ratio ANS✔✔ represented by the chemical formula; the composition that achieves a charge balance for
the electrically neutral crystal.
Coordination Number ANS✔✔ the number of ions of opposite charge that surround each ion in a crystal
Tetrahedral ANS✔✔ coordination number 4. Cation sits in interstitial space surrounded by 4 anions
Octahedral ANS✔✔ Coordination number 6. Cation sits in interstitial space surrounded by 6 anions.
Defect Structure ANS✔✔ Often used to designate the types and concentrations of atomic defects in ceramics
Electroneutrality ANS✔✔ The state of having exactly the same numbers of positive and negative electrical charges (ionic
and electronic)—that is, of being electrically neutral.
Stoichiometric ANS✔✔ state for ionic compounds in which the exact ratio of cations to anions as predicted by the
chemical formula is maintained
Nonstoichiometric ANS✔✔ When there is any deviation from the exact cation to anion
ratio. It can occur in some ceramic materials when two valence states exist for
one ion type. (i.e. Fe2+ and Fe3+)
, Solution 2024/2025
Pepper
Frenkel Defect ANS✔✔ a defect formed by a cation leaving its normal position and
moving into an interstitial site. There is no change in charge because the
cation maintains the same positive charge as an interstitial.
Schottky Defect ANS✔✔ In an ionic solid, a defect consisting of a cation-vacancy and anion-vacancy pair. Found in AX
materials. Electroneutrality is maintained because both the cation and anion have the same charge.
Glasses ANS✔✔ noncrystalline silicates containing other oxides. optical transparency and relative ease with
which they may be fabricated.
Refractories ANS✔✔ have the capacity to withstand high temperatures without melting or decomposing
Abrasives ANS✔✔ used to wear, grind, or cut away other softer materials. display high levels of hardness and wear
resistance and a high degree of toughness
Cements ANS✔✔ when mixed with water, they form a paste that subsequently hardens at
room temperature.
Flexural Strength ANS✔✔ strength required to resist bending of a bar of ceramic material to its point of fracture
Porosity ANS✔✔ volume fraction of a ceramic that consists of open spaces. Affects modulus of elasticity and flexural
strength negatively.
Natural Polymers ANS✔✔ include starch, cellulose, and proteins. Characterization of the molecular structures in these
has lead to the development of synthetic polymers, which are synthesized from
small organic molecules. Main characteristic is very long repeating molecules.
Synthetic Polymers ANS✔✔ polymers that are made from petroleum products and are long polymers
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