materila science & engineering - sheet 1
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sheet 1 of material science & engineering questions on chapter 2 Atomic structures and chapter 3 density computations DR. Ahmed Ramadan 2016 - summer course
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Material science1 lecture 1 part 1
A crystalline solid possesses rigid and long-range order, with atoms occupying specific positions. An amorphous solid lacks a well-defined arrangement and long-range order. A unit cell is the basic repeating structural unit of a crystalline solid and defines the positions of atoms, molecules, or ions within the structure.
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3. Calculate the density of cesium chloride given its body-centered cubic (bcc) unit cell length and the atomic masses of cesium and chlorine.
4. Determine if iron crystals with a given unit cell length and density have a body-centered cubic or face-centered cubic structure based on its atomic mass.
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Material science1 lecture 1 part 1
A crystalline solid possesses rigid and long-range order, with atoms occupying specific positions. An amorphous solid lacks a well-defined arrangement and long-range order. A unit cell is the basic repeating structural unit of a crystalline solid and defines the positions of atoms, molecules, or ions within the structure.
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The document provides information on solidification processes and binary alloy systems. It discusses:
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3. Calculate the density of cesium chloride given its body-centered cubic (bcc) unit cell length and the atomic masses of cesium and chlorine.
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This document summarizes the synthesis and characterization of two novel phosphonate-based cobalt cages. The first cage (Co15) has an inorganic core shaped like a distorted cubic structure composed of pentagonal faces. The second cage (Co12) has an inorganic core resembling a butterfly shape composed of hexagonal and triangular faces forming a tetrahedral geometry. Magnetic characterization shows both cages exhibit intramolecular antiferromagnetic interactions and zero field splitting at low temperatures.
Synthesis and Characterisation of Copper Oxide nanoparticles
Cupric oxide (CuO) nanoparticles were prepared by the chemical route by calcinations at a higher temperature from 300oC to 400 oC. For the comparison transmission electron microscopy (TEM) and x-ray diffraction (XRD) measurements were made through JCPDS. There is good agreement between data produced by spectroscopy and the microscopic measurements.
Forming characterization and evaluation of hardness of nano carbon cast iron
A rare work on the forming of nano cast iron, characterization and hardness measurement. Nano carbon is used in small increments as additions.
Lecture 01
The document provides an overview of materials science and engineering, including definitions, topics covered, and examples. It discusses the relationship between structure and properties of materials from the atomic to macroscale. Key points include that materials properties depend on their structure, processing can change structure, and examples are given of how electrical, thermal, and magnetic properties vary with changes in composition or deformation.
RSC Adv
1. A 2D coordination polymer was synthesized using cobalt trimers and the flexible ligand cis,cis-cyclohexane-1,3,5-tricarboxylate.
2. Single crystal X-ray diffraction shows the complex forms a 2D framework with channels and contains trinuclear cobalt secondary building units linked by the ligand.
3. Magnetic characterization reveals spin-canting ferromagnetic behavior at low temperatures based on AC susceptibility measurements. Gas adsorption experiments also show selectivity for CO2 over N2.
Chapter 3-Crystal Structure ceramic .pdf
Crystalline structures can be classified as crystalline, polycrystalline, or amorphous. Crystalline structures have repeating arrangements of atoms or molecules. There are seven crystal systems and fourteen Bravais lattices that describe how points in the unit cell are arranged in three-dimensional space. Common metal structures include body centered cubic, face centered cubic, and hexagonal close packed. Ceramic and semiconductor structures often involve ionic bonding between metals and nonmetals. Polymeric structures can be crystalline but typically have disordered regions as well.
Week-3-Day-1-Structure-of-Crystalline-Solids.ppt
- Atoms can assemble into crystalline or amorphous structures. Common metallic crystal structures are FCC, BCC, and HCP which can be used to predict a material's density based on its atomic properties and structure.
- Materials exist as single crystals or polycrystals. Single crystals are anisotropic while polycrystals are typically isotropic if their grains are randomly oriented.
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Week-3-Day-1-Structure-of-Crystalline-Solids.ppt
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- X-ray diffraction is used to determine crystal structures and interplanar spacings by exploiting the diffraction of X-rays by crystalline materials.
Lecture 02
The document discusses ceramic crystal structures and bonding. It covers rules for ionic structures based on charge neutrality and coordinating oppositely charged ions. Common crystal structures like NaCl and CsCl are presented based on filling space in a lattice. Predicting structures is based on ionic radii ratios and coordination numbers. Network structures of silicon oxides and glasses are also covered, along with defects in ceramics and glasses.
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materila science & engineering - sheet 1
- 1. Dr. Ahmed Ramadan Materials Technology Ex.2: Crystal Structure 1. What is the difference between atomic structure and crystal structure? 2. If the atomic radius of aluminum is 0.143 nm, calculate the volume of its unit cell in cubic meters. 3. Show for the body-centered cubic crystal structure that the unit cell edge length and the atomic radius (R) are related through a = 4R/√3 4. Show that the atomic packing factor for BCC is 0.68. Density Computations 5. Iron has a BCC crystal structure, an atomic radius of 0.124 nm, and an atomic weight of 55.85 g/mol. Compute and compare its theoretical density with the experimental value found inside the table 1. 6. Calculate the radius of an iridium atom, given that Ir has an FCC crystal structure, a density of 22.4 g/cm3 and an atomic weight of 192.2g/mol. 7. Calculate the radius of a vanadium atom, given that V has a BCC crystal structure, a density of 5.96 g/cm3, and an atomic weight of 50.9 g/mol. 8. Using atomic weight, crystal structure, and atomic radius data tabulated inside the table 1, compute the theoretical densities of lead, chromium, copper, and then compare these values with the measured densities listed in this same table. 9. Rhodium has an atomic radius of 0.1345 nm and a density of 12.41 g/cm3. Determine whether it has an FCC or BCC crystal structure. 10.The atomic weight, density, and atomic radius for three hypothetical alloys are listed in the following table. For each, determine whether its crystal structure is FCC, BCC, or simple cubic and then justify your determination. A simple cubic unit cell is shown in next table. Alloy Atomic Weight g/mol)) Density (g/cm3 ) Atomic Radius ( nm) A 77.4 8.22 0.125 B 107.6 13.42 0.133 C 127.3 9.23 0.142