CHEM0012 Chemistry of Metal Oxides Coursework
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CHEM0012 Chemistry of Metal Oxides Coursework
This coursework is due at Noon on 16th December.
Submission is via Moodle.
You must submit a typed answer: handwritten answers are not permitted. The maximum length of your submission is strictly two A4 pages including all figures. Your report must be in single column format, single spaced (or greater if you wish), with a minimum font size of 11 point (Calibri is recommended) for the main text and minimum margins of 0.5 cm on each side. Text can wrap around Figures. Over-length reports will be penalised by 10% and any work beyond two pages will not be read. Late submissions will be subject to UCL regulations. You may use figures from the lecture notes or open literature with correct attribution. However, original figures are encouraged (and rewarded), so that they illustrate your work and answer accurately.
Anything pasted (such as an equation) should be attributed Any quoted values of properties (e.g. lattice parameters) must be fully attributed and you should consider whether they are from reliable sources before using them.
A strong reminder: All material will be passed through Turnitin. You are directed to past material in CHEM0006, the student handbook, Chemistry Student Hub on what constitutes plagiarism. A single file must be submitted and be in one of the following file formats: pdf, Microsoft Word .doc or .docx, or PDF.
Bibliographies do not count towards the 2-page limit.
Question 1 Answer all parts.
This question is about rocksalt-structured oxides.
a) Using Kröger-Vink notation, list the native defects present in the rocksalt-structured compound TiO. [2 Marks]
b) Predict the type of magnetic ordering in MnO at low temperatures. Explain your answer. [3 marks]
c) Using the assumptions of the hard sphere model, write an equation for the lattice parameter of a rocksalt-structured binary oxide, in terms of the ionic radii of the cation and anion. Why does the hard sphere model often give accurate lattice parameters for metal oxides? Would you expect the hard sphere model to perform equally well for metal iodides? Explain your answer. [5 marks]
Question 2 Answer all parts.
This question is about the compound YInO3, which is an almost-colourless solid. Despite having ABO3 stoichiometry, YInO3 does not adopt the perovskite structure under normal conditions.
a) Explain why some ABO3 compounds do not adopt the perovskite structure. [2 marks]
b) Predict the charge states of the metal ions in YInO3 . Discuss the electronic structure of the material, and using this discussion, explain why YInO3 is colourless. [3 marks]
c) It was found that by doping YInO3, a brightly coloured pigment could be produced. Suggest an element that could be doped into YInO3 to produce a coloured compound. Explain why you chose this element, and discuss how it might enter into the YInO3 structure. Suggest a synthesis method for your doped material. [5 marks]
Question 3
Compare and contrast the role of the elements Cobalt and Indium in oxide materials for technological applications. [10 marks]
Your answer should include a discussion of the uses of their binary oxides. You are encouraged to make reference to the case studies considered in the course material, but also to reference other appropriate examples from the scientific literature. You may also wish to consider other topics such as ternary oxides, the elements as dopants in other metal oxides, and wider economic or sustainability concerns.
2022-12-12