Gold exhibits a face-centered cubic unit cell that is 4.08 A on a side. Estimate gold’s density, in g/cm 3. D = m V = 4 atoms (197.0 amu/at.) (4.08 A)

Slides:

Advertisements

Similar presentations

Objectives By the end of this section you should: understand the concept of close packing know the difference between hexagonal and cubic close packing.

Advertisements

Cara Barskey, Brendan Degnan, Courtney Gregor

Figure 16.9: Three cubic unit cells and the corresponding lattices.

Common crystal structures Simple close packed structures atoms hard spheres problem of structure most efficient packing Donuts * *Proposition made by Goldschmidt.

Solids Ch.13. Solids Fixed, immobile (so to speak) Fixed, immobile (so to speak) Symmetry Symmetry Crystals Crystals So what’s the inner order? So what’s.

PRINCIPLES OF PRODUCTION ENGINEERING

PH0101,UNIT 4,LECTURE 51 PH0101 UNIT 4 LECTURE 5 FACE CENTERED CUBIC STRUCTURE HEXAGONAL CLOSED PACKED STRUCTURE PROBLEMS.

How do atoms ARRANGE themselves to form solids? Unit cells

Lecture 4 The structure of crystalline solids L e a r n i n g O b j e c t i v es outcomes: 1.Describe the difference in atomic/molecular structure between.

S PHERE P ACKING Math Day 2015 Kristin DeVleming.

Typical Crystal Structures

Chapter 3 -1 ISSUES TO ADDRESS... How do atoms assemble into solid structures? How does the density of a material depend on its structure? When do material.

L Consider coordination of anions about a central cation Coordination Polyhedra Halite Cl Cl Cl Cl Na.

Solids Classified into two general types: a.Crystalline b.amorphorous.

SURFACE AREA and VOLUME of RECTANGULAR PRISMS and CUBES.

Chapter 3: Structure of Metals and Ceramics Goals – Define basic terms and give examples of each: Lattice Basis Atoms (Decorations or Motifs) Crystal Structure.

Chapter 2. Reciprocal Lattice Issues that are addressed in this chapter include: - Reciprocal Lattice - Packing Factor - Bragg law - Scattered wave amplitude.

Factors affecting metallic bond strength Metallic crystal structures

Structures of Solids. Glass (SiO 2 ) Crystal Noncrystal Solid.

Chapter 3 The Structure of Crystalline Solids Session I

Metallic Bonds and Metallic Properties

Hole Answer the following questions for both packing diagrams. 1.Draw the unit cell for each packing example. How many atoms I are there in each unit cell?

STRUCTURE OF METALS Materials Science.

Chapter 12: Solids. Types of Solids: Ionic Molecular Network: crystalline amorphous Metallic.

Crystalline Structures Edward A. Mottel Department of Chemistry Rose-Hulman Institute of Technology.

Crystalline Structures Edward A. Mottel Department of Chemistry Rose-Hulman Institute of Technology.

Crystalline Structures Edward A. Mottel Department of Chemistry Rose-Hulman Institute of Technology.

Bonding in Metals Section 7.3. Objectives  When you complete this presentation, you will be able to …  Model the valence electrons of metal atoms. 

Section 7.3. Understanding Metal Atoms The behavior of a metal can be better explained if we understand that it is actually a collection of cations, rather.

WEEK 2 STRUCTURE OF MATERIALS MATERIALS SCIENCE AND MANUFACTURING PROCESSES.

1 Unit 2 - Crystallography In most solids, atoms fit into a regular 3-dimensional pattern called a crystal In most solids, atoms fit into a regular 3-dimensional.

Structure of crystalline solids

Instructor: Dr. Upali Siriwardane

Ionic Compounds and Ionic Bonds Compounds composed of cations and anions are called ionic compounds. Ionic bonds – the electrostatic force that holds ions.

Solid State Physics (1) Phys3710

Chapter 1 Crystal Structures. Two Categories of Solid State Materials Crystalline: quartz, diamond….. Amorphous: glass, polymer…..

Crystal Structure A “unit cell” is a subdivision of the lattice that has all the geometric characteristics of the total crystal. The simplest choice of.

MATERIALS SCIENCE Week 2 STRUCTURE OF MATERIALS. Why Study Crystal Structure of Materials? The properties of some materials are directly related to their.

Density The make up and structure of all matter!!!

Closest Packing of Spheres How do spheres (atoms) pack to best fill space?? The concept of closest packing is important for understanding many solid structures.

Announcement Date Change 10/13/10 Nick Heinz 11/05/10 8:30am start

Chapter 11 Sections 7 and 8 Sherry Matthew Mary Same Rachel Wolver.

Chemistry. Solid State-II Session Objectives  Voids  Packing fraction.

Chapter 3: The Structure of Crystalline Solids

Bonding in Metals. Objectives Be able to model the valence electrons of metal atoms Describe the arrangement of atoms in a metal Explain the importance.

Angles About Us. Water Properties of Water Temperature distribution in a lake Summer compared to winter.

Metallic –Electropositive: give up electrons Ionic –Electronegative/Electropositive Colavent –Electronegative: want electrons –Shared electrons along bond.

Crystalline Solids BLB 12 th Chapter 12 Sections 1-3, 5.

Objectives Packing fraction in: Simple cubic unit cell

§2.4 Crystal Structure and Complex Lattice

Prentice Hall © 2003Chapter 11 Types of Solids Molecular Solidsex. CO 2, H 2 O, Ar Covalent-Network Solidsex. Diamond, quartz, SiO 2 Metallic Solidsex.

11.7 Structures of Solids Zek Zhang Kevin Nash, *Matt Coleman¯\_( ツ )_/¯ *yeah were not racist, the non-white is not last.

UNIT CELL – The smallest repeating unit of a crystalline solid EXP11-1 (of 11) UNIT CELLS.

Intermolecular Forces and States of Matter AP Chemistry.

Unit 1 Fundamentals 1  Atomic Structure?  Crystal Structure?  Types of Crystals?

Crystal lattice structure

Chapter 3: Structure of Metals and Ceramics

THE SPACE LATTICE AND UNIT CELLS CRYSTAL SYSTEMS AND BRAVAIS LATTICES.

Chemistry 481(01) Spring 2017 Instructor: Dr. Upali Siriwardane

CRYSTAL LATTICE & UNIT CELL

Crystallography and Structure

Solid State Lattices.

Crystal and Amorphous Structure in Materials

Lecture 1: Stacking of atoms

Crystal and Amorphous Structure

Structure of metals Metals exhibit different properties

UNIT CELLS UNIT CELL – The smallest repeating unit of a crystalline solid EXP11-1 (of 11)

Coordination Polyhedra

10.4 Structure and Bonding In Metals

Meeting 1, Tuesday, Jan. 8, 2019 Goals for this Meeting:

Presentation transcript:

Gold exhibits a face-centered cubic unit cell that is 4.08 A on a side. Estimate gold’s density, in g/cm 3. D = m V = 4 atoms (197.0 amu/at.) (4.08 A) 3 = 1.16 x x10 –8 cm amu cm 3 ( 1 g 6.02 x amu ) = 19.3 g cm 3

close-packed layer. Roughly equal-sized spheres, such as those in metallic solids, are arranged in one of several configurations. These configurations are collectively called the close packing of spheres. -- In a given layer, the atoms are arranged such that each atom in that layer is surrounded by six others. This is called a...

C cubic close packing hexagonal close packing Name of Pattern A 1 (bottom) B A B 4 (top) close-packed layer position close-packed layer position Layer Number ** Cubic close packing is equivalent to the face-centered cubic unit cell. (HCP)(CCP/FCC)

HCP: The coordination number for a packing pattern is equal to the number of equidistant, nearest neighbors for any atom within the matrix. -- for particular packing arrangements: CCP/FCC: BCC:P/SC: X X X X For unequal-sized spheres, sometimes the larger spheres assume a close-packed arrangement, and then the smaller particles fit into the spaces in between.