Unit-1 THE SOLID STATE QUESTIONS VSA QUESTIONS (1 - MARK QUESTIONS) 1. 2. 3. 4. 8. 9. What are anistropic substances. Why are amorphous solids isotropic in nature? Why glass is regarded as an amorphous solid? Define the term ’crystal lattice.’ Define the term voids. What type of stochiometric defect is shown by (i) ZnS and (ii) CsCl? [Hint. : (i) Frenkel defect (ii) Schottky defect] *10. If the formula of a compound is A2B‚ which sites would be occupied by A ions? [Hint. : Number of A ions is
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Paragraph 1 The research paper written by Haines et al. concerns the investigation of structural and chemical properties of quartz-type FePO4‚ where observations are made regarding the quartz-type FePO4 at elevated temperatures and during the occurrence of the α- β transition stage. The temperature range that was selected for the investigation was from 294K to 1073K and the investigation was carried out by neutron powder diffraction. The properties of the quartz-type FePO4 was compared to other α-quartz
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Engineering Materials Week 2 3.1 What is the difference between atomic structure and crystal structure? Atomic structure relates to the number of protons and neutrons in the nucleus of an atom. Crystal structure pertains to the arrangement of atoms in the crystalline solid material. 3.9 Calculate the radius of a tantalum atom‚ given that Ta has an BCC crystal structure‚ a density of 16.6 g/cm^3‚ and an atomic weight of 180.9 g/mol. For BCC n=2 atoms/unit cell 3.47 Below are shown three different
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Group A: Model Answer GROUP A MODEL ANSWER Yoshida et al.‚ Flexibility of Hydrogen Bond and Lowering of Symmetry in Proton Conductor‚ Symmetry 2012‚ 4‚ 507-516. DO NOT PLAGIARISE THIS MODEL ANSWER PLAGIARISM FROM ANY SOURCE AUTOMATICALLY LEADS TO A ZERO SCORE Paragraph 1 There are three phases whereby each has a different crystal structure at three different temperatures. At room temperature (298K)‚ Phase III is present whereby Cs3H(SeO4)2 has a crystal structure of a monoclinic
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Paragraph 1: Temperature; driver for the change of symmetry There are 3 different phases that are observed and each of them are influenced by temperature. In addition‚ in each phase‚ the polymorph exhibits different crystal structures. At room temperature of 298K‚ it will be in phase 3 where it takes the structure of monoclinic-C2/m. When the temperature rises to 396K‚ it undergoes a transition into Phase 2 also known as the high-temperature monoclinic-A2/a phase. At Phase 2‚ the lattice parameters
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Yoshida et al.‚ Flexibility of Hydrogen Bond and Lowering of Symmetry in Proton Conductor‚ Symmetry 2012‚ 4‚ 507-516. Paragraph 1 In this paper‚ we take a look at the different phases of the Cs3H(SeO4)2 polymorphs. There are 3 different phases that is observed and each of them is influenced by the temperatures. In addition‚ in each phase‚ the polymorph exhibits different crystal structure. At the room temperature of 298K‚ it will be in phase 3 whereby it takes the structure of monoclinic-C2/m
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X-Ray Diffraction X-ray powder diffraction (XRD) is a rapid analytical technique primarily used for phase identification of a crystalline material and can provide information on unit cell dimensions. The analyzed material is finely ground‚ homogenized‚ and average bulk composition is determined. Fundamental Principles of X-ray Diffraction Max von Laue‚ in 1912‚ discovered that crystalline substances act as three-dimensional diffraction gratings for X-ray wavelengths similar to the spacing of
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LEARNING LOG 2: Observe‚ Connect and Reflect on Your Learning PART III – Symmetry in Crystals The most striking examples of symmetry…are crystals. Herman Weyl Period Focus Image Question Your Observations Complete at the end of Week 5 Image 5 Uvarovite is a gemstone rich in chromium. What are your main observations about uvarovite symmetry from studying the external form? (30 - 40 words) (2 marks) What is your personal favourite gemstone and what is its space group. (up to
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II. Crystal Structure A. Lattice‚ Basis‚ and the Unit Cell B. Common Crystal Structures C. Miller Indices for Crystal Directions and Planes D. The Reciprocal Lattice A. Lattice‚ Basis‚ and Unit Cell An ideal crystalline solid is an infinite repetition of identical structural units in space. The repeated unit may be a single atom or a group of atoms. An important concept: crystal structure = lattice + basis = + lattice: a periodic array of points in space. The environment surrounding
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APL102: Materials Science and Engineering Minor Test I 28th. Aug. 2014 Maximum Marks 60 1 Why do we not have an end-centred tetragonal lattice? Consider both the cases of end centring: (a) centring of opposite square faces of the unit cell and (b) centring of opposite rectangular faces of the unit cell. 12 2 Draw a plane in a BCC unit cell . Show your choice of origin and axes. Include in your drawing all the close packed directions lying in this plane and give their Miller indices
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