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Laminar compounds are characterized by having
a) a high value of the internal surface of the solid.
b) a high adsorption potential.
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- 7. Consider these three labelled specific volume vs. temperature plots that may be displayed by various types of materials. Indicate the one, which best describes the behaviour expected from PP with a spherulitic structure. (a) sp. volume (b) (c) temperatureCalculate the packing fractions of (i) a primitive cubic unit cell, (ii) a bcc unit cell, (iii) an fcc unit cell, where each cell is composed of identical hard spheres. Hint: Start by identifying the unit cell and working out which atoms are in contact.a) Draw rock salt unit cell of NaCl and give the coordinates (u,v,w) describing the positions of all the atoms in such a unit cell. b) Calculate the structure factor |F_hkl|^ 2 for such a unit cell for x-ray scattering from a given set of crystallographic planes (hkl). c) Which reflection peaks have the lowest and highest intensities and why
- Please provide step-by-step anwser What is the probable lattice type of crystalline substances that give the following observed reflections? Body centered? Face centered? Etc.? (a) 100, 110, 111, 200, 210 (b) 001, 110, 200, 111, 201Describe in a few sentences the effect of temperature on a typical ferromagnetic material. Provide a qualitative plot of B vs. T.vA) The contact angle for water on clean glass is close to zero. Calculate the surface tension of water at 20 C given that at that temperature water climbs to a height of 4.96 cm in a clean glass capillary tube of internal radius 0.300 mm. The density of water at 20 C is 0.9956 g cm-3. B) What change (if any) you will expect for surface tension in A if the contact angle will be between 10 º and 20 º?
- 3) Draw two different projections of a monoclinic unit cell with a = 3 Å, b = 4 Å, c = 5 Å, B = 119⁰. (Don't forget to indicate the basis vectors.) One atom is located at (0.2, 0.3, 0.4), another one at (0.2, 0.7, 0.4). Determine the interatomic distances < 2.5 Å.The name ferrites refers to a family of(a) ceramic materials that exhibit ferrimagnetic behavior due to their ionic composition.(b) polymeric materials that exhibit ferrimagnetic behavior due to their ionic composition.(c) concrete-based materials that exhibit ferrimagnetic behavior due to their ionic composition.(d) superconducting materials that exhibit ferrimagnetic behavior due to their ionic composition.The angle of a Bragg reflection from a set of crystal planes separated by 99.3 pm is 20.85°. Calculate the wavelength of the X‑rays.
- Discuss the importance of bulk vs. surface properties of biomaterials. Briefly describe the importance of “biomaterials surface” considering the series of events following implantation of it.Sketch the electronic band structure of a semiconducting material, and give an example for an intrinsic and an extrinsic semiconducting material.8. The contact angle for water on clean glass is close to zero. Calculate the surface tension of water at 30°C given that at that temperature water climbs to a height of 11.2 cm in a clean glass capillary tube of internal radius 0.130 mm. The density of water at 30°C is 0.9956 g cm3. a) 70.1 mN m²l b) b) 71.1 mNm™¹ c) 72.3 mNm™¹ d) 73.0 mN m
