Assuming the crystal NaCl contains 2% defects on the sodium site, use your answer from part (a) to calculate the defect concentration, [V.. Na], in m-3. The answer to (a) was 161.88 Å^3 Question for (a) was: The main peak (200) in the X-ray diffraction pattern of NaCl appears at 32.82o 2-theta when Cu radiation is used. Calculate the unit cell volume of NaCl using this information.
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- 6.1) At the composition of 0.77% by weight C, identify the phase(s) presentat 950 degrees C 6.2) When the specimen is at 950 degrees C, what is the maximum C composition at which a single phase Austenite is stable?6.3) If we slowly cool a Fe-C alloy with 0.77% by weight C, austenitized at950 degrees C, to just below the eutectoid temperature of 727 degrees C, give the weight percentage and composition of the phases present based on the phase diagram given above6.4) If we cool very quickly a Fe-C alloy with 0.77% by weight C,austenitized at 950 degrees C, to room temperature, give the weight percentage and composition of the phase(s) presentFor a Copper-Nickel (Cu-Ni) alloy of composition 25 wt % Ni and 75 wt % Cu at 1200 OC (Point B), refer to the phase diagram provided in Figure 2 and answer the following. (i) What is composition of liquid phase? (ii) What is composition of solid phase? (iii) What fraction of the system is liquid for a 25% Ni alloy at 1250 OC? (iv) What fraction of the system is solid for a 25% Ni alloy at 1250 OC?Fluorite (CaF2) has a face centered cubic structure, space group 225, with network parameter equal to 5.45 Å), with four CaF2 units per cell unitary (Ca+ at site 4a(0,0,0) and F- at site 8c(1/4.1/4.1/4 and 3/4.3/4.3/4) + face centered cubic lattice translations for both ions). a) Get a simplified expression for the structure factor F(hkl) of fluorite. (b) What condition must be fulfilled by the Miller indices h,k,l in such a way that F(hkl) ≠ 0?
- A device to understand how iron behaves at high temperatureswe want to design. This device (with 1% accuracy) allows the change in volume (heating) of a 1cm 3 iron cube.the resulting polymorphic transformation) must be able to feel. HMK structure in iron 911 0 C and latticeparameter 0.2863 nm. At 913 0 C, it has YMK structure and its lattice parameter is 0.3591 nm. Of measuring instrumentDetermine the accuracy tolerance it needs (i.e. at least how many cm 3 to detect a changemust). It is necessary to use at least 6 digits after the comma in this question. Hint: YMK first andFor HMK, the volume of an atom is found and then, using the number of atoms in each structure, the ironThe question can be started by finding the different volumes.9) A Cu monocrystal (FCC) of 10 cm length is pulled in tension. The stress axis is [¯123].a) Which is the stress system with the highest resolved shear stress?(b) If the extension of the crystal continues until a second slip systembecomes operational, what will this system be?(c) What rotation will be required to activate the second system?(d) How much longitudinal strain is required to activate the second system?Discuss glass transition temperature and the factors affecting GTT and what are its significances. Give detailed answer please
- (d) By using the data provided below, calculate the PillingBedworth ratio for the nickel (Ni) – nickel oxide (NiO) system and determine whether NiO is protective against corrosion. Atomic mass of nickel = 58.7 g.mol-1 Density of nickel = 8.91 Mg.m-3 Molecular mass of nickel oxide = 74.7 g.mol-1 Density of nickel oxide = 6.67 Mg.m-3 (e) A stainless steel pressure vessel that has fracture toughness, K1C, of 197 MN.m-3/2 is going to be exposed to a stress of 398 MN.m-2 . By using this information explain how designers can determine the thickness of the vessel so that catastrophic failure can be avoided.The addition of dimethylglyoxime, H2C4H602N2, to a solution containing nickel(Il) ion gives rise to a precipitate: Nickel dimethylglyoxime is a bulky precipitate that is inconvenient to manipulate in amounts greater than 135 mg. The amount of nickel in a type of permanent-magnet alloy ranges between 22% and 38%. Calculate the sample size that should not be exceeded when analyzing these alloys for nickel.11) JJ Techie calcined some ceramic powders at 1600℃ for 12 hrs, when removed from thefurnace, JJ was upset to find a big hard lump. Explain to JJ what happened. (10 points)12) Continue to Question 9, After grinding up to the lump, someone told JJ to add a sintering aidand deflocculant to the ceramic before trying to press it into cylinders 10 inch by 0.25 inch indiameter. Do you have any suggestions for JJ? JJ needs this size ceramic rod for experiments. Number 12 please the information in question 11 is applicable.
- Phase Behavior of Elemental Gallium: Gallium (Ga) is one of the few metals that is liquid near room temperature (Tm = 302 K). a) The vapor pressure for Ga has been measured at 100 Pa at 1620 K and 10 kPa at 2125 K. What is the average metal-metal bond strength (in kJ/mol) for Ga assuming a liquid state coordination number of 6? b) What is the boiling point ( in K) for Ga in a standard lab at sea-level given the above informationConsider the following series of poly(phenylene oxide) polymers A–D, and their glass transition temperatures. Explain how the differences in structure can account for the differences in TgRationalise what adding Na2O (a network modifier) to B2O3 does to the structure of the glass. Begin by sketching the influence of Na(+) and O(2-) on the SRO of the glass to predict the observed changes to MRO and associated bulk properties. If you like, comment on the changes to the dynamics (eg. vibrations) in the glass after modification.