You have ZrO2-Nb2O5 composite and HfO2-Ta2O5 composite. Can you distinguish the oxide phases in the composites using SEM imaging? How do you identify different oxide phases?
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You have ZrO2-Nb2O5 composite and HfO2-Ta2O5 composite. Can you distinguish the oxide phases in the composites using SEM imaging? How do you identify different oxide phases?
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- AZ91 alloy; a) What is its chemical composition? b) Which of the strength increasing methods are suitable and which are not? Explain c) Is nitration suitable as one of the surface hardening methods? Please explainConsider the mineral dissolution reactions below: FeSmackinawite -> Fe2+ + S2- CuScovellite -> Cu2+ + S2- ZnSsphalerite -> Zn2+ + S2- Calculate the DG°r for each reaction, and then calculate the Ksp for each sulfide phase.Gadolinium is used as a contrast agent in MRI. Which magnetic state of matter ischaracteristic of Gd?
- How is the MnO4- ion different from the Cu2+ metal ion in regards to UV-Vis?Zinc is to be used as an internal standard for the polarographic analysis of thallium. A standard solution containing twice the concentration of zinc as Thallium has a diffusion current of 1.89 µA for Ti and 3.50 µA for Zn. A 10.0g alloy was dissolved in 500 mL, 25 mL of this solution was mixed with 25 mL of 1.0 x 10-3 M Zn 2+ solution. The diffusion currents of this final solution are 18.2µA for Tl+ and 14.5µA for Zn+. Calculate % Ti in the sample analysedFor dissolution of dopant ZrO2 into the host lattice of Y2O3, does the following defect reaction satisfy the requirements of mass conservation, charge neutrality, and site balance (stoichiometry)? 2 ZrO2 -(Y2O3) -> 2 ZrY + 3 Ox + ½ O2 (g) + 2eʹ
- (i) What type of non-stoichiometric point defect is responsible for the pink colour of LiCl?(ii) What type of stoichiometric defect is shown by NaCl?1.A compound Y (150.0 g/mol) in a 1.00 cm quartz cell has an extinction coefficient (ε) of 23,150 at λmax=235 nm. What is the energy absorbed by the compound at the maximum of the peak? Note that hc=1.98644586×10−25J*m. Report your answer in KJ/mole to the correct number of significant figures. Do not include the units in your answer 2.In general, we want to have absortions less than or equal to 1. What percentage of the incident light is transmitted when absorption is 1? Report your answer to the nearest whole number. 3.An ethanol solution of 3.5 mg/100 ml of compound Y (150.0 g/mol) in a 1.00 cm quartz cell has an absorbance (A) of 0.972 at λmax=235 nm. What is its molar extinction coefficient? Report your answer to the correct number of significant figures.(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.
- Why are adsorbate particles attracted and retained on the surface ofadsorbent?What part does adsorption play in froth floatation for the concentration of sulphide ores and heterogeneous catalysis?If blast furnace slag is activated by NaOH, resulting in the formation of alkali-activated slag (AAS) – what kind of phases form in this system over time? How does the precipitated phase assemblage change with a change in the composition of the precursor slag? What differences exist in these formed phases in AAS systems when compared to blended systems such as OPC-Slag mixtures?