Homework Answers
CaCl2 into NaCl, in which each Ca2+ replaces
two Na+ and creates one cation vacancy
Frenkel defect = vacancy + interstitial in close proximity
Schottky defect = cation vacancy + anion vacancy in close proximity
an anion vacancy is linked with the either with anion interstetial or cation vacancy.
every cation interstetial finds a cation vacancy
so option is b.
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3. A Ca2+ ion is added into NaCl crystal, generating point defects in the crystal. Which...
3) Compare the concentration of positive ion vacancies in a NaCl crystal due to the presence of 10^(-4) mol fraction of...
3) Compare the concentration of positive ion vacancies in a NaCl crystal due to the presence of 10^(-4) mol fraction of CaCl2 impurity with the concentration you would expect in pure NaCl crystal at 400C. The formation energy ( delta hs) of a vacancy pair in pure NaCl is 2.12 ev, and the mole fractions of such defects at the melting point (800°C) is 2.8X10^(-4).
Indicate whether the following statements are TRUE or FALSE. Impurity point defects are found in solid...
Indicate whether the following statements are TRUE or FALSE. Impurity point defects are found in solid solutions of which there are two types: substitutional and interstitial. TRUE/FALSE Interstitial diffusion involves the interchange of an atom from normal lattice position to adjacent vacant lattice site or vacancy. TRUE/FALSE For an edge dislocation, dislocation line and Burgers vector are parallel. TRUE/FALSE The maximum concentration of solute atoms that may dissolve in the solvent to form solid solution is called solubility limit. TRUE/FALSE...
NaCl has a rock salt crystal structure with a unit cell edge length of 0.56 nm....
NaCl has a rock salt crystal structure with a unit cell edge length of 0.56 nm. The atomic weights of the Na and Cl are 23 and 35.5 g/mol, respectively, and the Avogadro's number is 6.022 x 10“ formula units/mol. (a) Draw a unit cell to show the crystal structure of the NaCl. (b) What is the coordination number of the atoms in this structure? (c) How many Na atoms and Cl atoms in one unit-cell of such a structure?...
The selenate ion, SeO32-, is classified as which of the following? a. polyatomic cation b. monoatomic...
The selenate ion, SeO32-, is classified as which of the following? a. polyatomic cation b. monoatomic cation c. polyatomic anion d. monoatomic anion e. none of the above
3. (5 points) Which type of defect includes an additional half-plane of atoms within a crystal?...
3. (5 points) Which type of defect includes an additional half-plane of atoms within a crystal? a) Phase boundary b) Edge dislocation c) Screw dislocation d) Grain boundary 4. (5 points) A mixed dislocation is a type of a) Linear defect b) Interfacial defect c) Point defect d) Volume defect 5. (5 points) The figure shown below is an example of a a) Point defect b) Planar (i.e. two-dimensional) defect c) Linear defect d) Volumetric defect 6. (5 points) Grain...
Q2. Atomic radius, crystal structure, electronegativity, and the most common valence are given in the following...
Q2. Atomic radius, crystal structure, electronegativity, and the most common valence are given in the following table for several elements: for those that are nonmetals, only atomic radii are indicated. Atemic Radias (nm) Electro- negativity Crystal Stractare Which of these elements would you expect to form the following with nickel: (a) a substitutional solid solution having Valence Element +2 18 FCC 0.1246 Ni. 0,071 C complete solubility (b) a substitutional solid solution of incomplete solubility 0.046 0.060 +1 1.9 0.1445...
Identification of the negative ion in the unknown solution From your test results, what negative ion (anion) is...
Identification of the negative ion in the unknown solution From your test results, what negative ion (anion) is present in your unknown? Explain your choice. Testing for Cations and Anions Report Sheet Questions and Problems Q.1 How do the tests on known solutions containing cations and anions make it possible for you to identify the cations or anions in an unknown substance? Q2 You hive a solution that is composed of either NaCl or CaCl, What tests would you run...
Can you please solve 3 and 4 with neat handwriting ? Could you explain each step...
Can you please solve 3 and 4 with neat handwriting ?
Could you explain each step so I can understand?
Q3) Using the following data that relates to the formation of vacancy defects in a metallic sample. Determine the following: a) The energy for defect formation in (V) b) The equilibrium number of vacancy defects per cubic meter at 1000 C T°C] Nv/ ml 750 5.7 x 10 1000 ? 1500 5.8 x 1017 Q4) Draw a series of schematics...
Name: MCEG-2023 Engineering Materlals June 14 2019 QUIZ Take home quiz, due on Monday, June 17...
Name: MCEG-2023 Engineering Materlals June 14 2019 QUIZ Take home quiz, due on Monday, June 17 Q1. Calculate the number of vacancies per cubic meter in gold (Au) at 900 C. The energy for vacancy formation is 0.98 ev/atom. Furthermore, the density and atomic weight for Au are 18.63 g/cm3 (at 900 C) and 196.9 g/mol, respectively. Q2. Atomic radius, crystal structure, electronegativity, and the most common valence are given in the following table for several elements; for those that...
which of the following is not a cation A) K+ B) Ca2 C) Mg2+ D) Cl-...
which of the following is not a cation A) K+ B) Ca2 C) Mg2+ D) Cl- E) Na+
Indicate whether the following statements are TRUE or FALSE. Impurity point defects are found in solid solutions of which there are two types: substitutional and interstitial. TRUE/FALSE Interstitial diffusion involves the interchange of an atom from normal lattice position to adjacent vacant lattice site or vacancy. TRUE/FALSE For an edge dislocation, dislocation line and Burgers vector are parallel. TRUE/FALSE The maximum concentration of solute atoms that may dissolve in the solvent to form solid solution is called solubility limit. TRUE/FALSE...
NaCl has a rock salt crystal structure with a unit cell edge length of 0.56 nm. The atomic weights of the Na and Cl are 23 and 35.5 g/mol, respectively, and the Avogadro's number is 6.022 x 10“ formula units/mol. (a) Draw a unit cell to show the crystal structure of the NaCl. (b) What is the coordination number of the atoms in this structure? (c) How many Na atoms and Cl atoms in one unit-cell of such a structure?...
3. (5 points) Which type of defect includes an additional half-plane of atoms within a crystal? a) Phase boundary b) Edge dislocation c) Screw dislocation d) Grain boundary 4. (5 points) A mixed dislocation is a type of a) Linear defect b) Interfacial defect c) Point defect d) Volume defect 5. (5 points) The figure shown below is an example of a a) Point defect b) Planar (i.e. two-dimensional) defect c) Linear defect d) Volumetric defect 6. (5 points) Grain...
Q2. Atomic radius, crystal structure, electronegativity, and the most common valence are given in the following table for several elements: for those that are nonmetals, only atomic radii are indicated. Atemic Radias (nm) Electro- negativity Crystal Stractare Which of these elements would you expect to form the following with nickel: (a) a substitutional solid solution having Valence Element +2 18 FCC 0.1246 Ni. 0,071 C complete solubility (b) a substitutional solid solution of incomplete solubility 0.046 0.060 +1 1.9 0.1445...
Identification of the negative ion in the unknown solution From your test results, what negative ion (anion) is present in your unknown? Explain your choice. Testing for Cations and Anions Report Sheet Questions and Problems Q.1 How do the tests on known solutions containing cations and anions make it possible for you to identify the cations or anions in an unknown substance? Q2 You hive a solution that is composed of either NaCl or CaCl, What tests would you run...
Can you please solve 3 and 4 with neat handwriting ?
Could you explain each step so I can understand?
Q3) Using the following data that relates to the formation of vacancy defects in a metallic sample. Determine the following: a) The energy for defect formation in (V) b) The equilibrium number of vacancy defects per cubic meter at 1000 C T°C] Nv/ ml 750 5.7 x 10 1000 ? 1500 5.8 x 1017 Q4) Draw a series of schematics...
Name: MCEG-2023 Engineering Materlals June 14 2019 QUIZ Take home quiz, due on Monday, June 17 Q1. Calculate the number of vacancies per cubic meter in gold (Au) at 900 C. The energy for vacancy formation is 0.98 ev/atom. Furthermore, the density and atomic weight for Au are 18.63 g/cm3 (at 900 C) and 196.9 g/mol, respectively. Q2. Atomic radius, crystal structure, electronegativity, and the most common valence are given in the following table for several elements; for those that...
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