CH1105: Materials Science Crystal Structure Assoc/Prof Timothy Tan Office: N1.2 B2-34 B2Tel: 6316 8829 E-mail: tytan@ntu.edu.sg Semester 1‚ 2013-2014 2013School of Chemical and Biomedical Engineering Why study structure of crystalline solids? To understand how atoms assemble geometrically into solid structures To describe the structure of solids To relate material properties to its structure 2 Energy and Packing Dense‚ regular packing Energy typical neighbor bond length typical
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Crystals form in the depths of the Earth to the extension of the clouds in sky. Some think that crystals elude the sight of people’s eyes everyday in life‚ but they are everywhere including ingredients for food‚ construction materials‚ and even in ice-cold weather. The crystals in this experiment are ammonia-generated crystals that can be created right in a home. The experiment will be testing the different effects and products on crystals in different temperatures and forms of light. Different measurements
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contrast the crystal structures and crystal chemistry of quartz‚ α-FePO4 and β-FePO4. Both α-FePO4 (space group: P3121) and α-quartz (space group: P3121 and P3221) belong to the trigonal crystal system‚ while β- FePO4 (space group: P6422) and β-quartz (space group: P6222 and P6422) belong to the hexagonal crystal system. At relatively low temperature‚ FePO4 is tetrahedral in structure. This is similar to the tetrahedral structure of quartz. As temperature increases‚ the tetrahedral structure gradually
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Crystal Needles: Crystal Needles are a great introduction to crystal growing. You can have some delicate‚ really cool crystals going within three hours time! Ingredients: •a cup or small bowl •1/2 cup Epsom salt (magnesium sulfate) •1/2 cup hot tap water •(optional) a drop of food coloring Directions: 1.Add the ingredients together in your bowl or cup. 2.Stir the solution until all the salt is dissolved. There may be some crystals still at the bottom‚ but that’s ok. 3.Place the cup
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Crystal Research Paper A crystal is made up of the same materials that a regular glass is made of‚ such as silica‚ soda‚ and lime‚ but the addition of lead oxide is what gives crystals their shine. A bead has to have 24% lead oxide added to qualify as leaded crystal. Contrary to the popular belief‚ crystals have been around for a long time. Ancient Egypt‚ Rome‚ and other groups have all used crystals for various purposes. It was used in medicine‚ magic and rituals‚ as offerings and currency‚ as
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[pic] WORLD’S TOP CRYSTAL BRANDS 2009 Lalique [pic]homeshopping - 3 years ago [pic] René Lalique became synonymous with French Art Nouveau decorative arts. René Lalique was born in 1860 and first began designing fine jewelry in Paris in 1881. Lalique pursued increasingly more innovative experimentation in glass commencing around 1883. Early works used the familiar "lost wax" technique by which the model is made in wax while a mold is formed around the model. Then‚ the wax is melted and molten glass
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The Crystal Palace is a vital part of England ’s history. Constructed in the midst of England ’s Victorian Era‚ the Crystal Palace was conceived to symbolize this industrial‚ military and economic superiority of Great Britain ("The Great Exhibition at the Crystal Palace"). The Crystal Palace was designed by Joseph Paxton for the purpose of hosting the Great Exhibition in 1851. The construction of the Crystal Palace was rapid due to the controversial design of Joseph Paxton. Therefore‚ the Crystal
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Crystal Properties and Growth of Semiconductors In studying solid state electronic devices we are interested primarily in the electrical behavior of solids. However‚ we shall see in later chapters that the transport of charge through a metal or a semiconductor depends not only on the properties of the electron but also on the arrangement of atoms in the solid. In the first chapter we shall discuss some of the physical properties of semiconductors compared with other solids‚ the atomic arrangements
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quite solid‚ neither is it a liquid. Liquid crystals are another important intermediate phase which exhibits features from both the solid and the fluid state. Liquid crystals have the ordering properties of solids but they flow like liquids. Liquid crystalline materials have been observed for over a century but were not recognized as such until 1880s. In 1888‚ Friedrich Reinitzer (picture) is credited for the first systematic description of the liquid crystal phase and reported his observations when
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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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