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BYOE: A Portable Table-top Lab for Exploring Crystal Structures

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Conference

2015 ASEE Annual Conference & Exposition

Location

Seattle, Washington

Publication Date

June 14, 2015

Start Date

June 14, 2015

End Date

June 17, 2015

ISBN

978-0-692-50180-1

ISSN

2153-5965

Conference Session

Division Experimentation & Lab-Oriented Studies: Bring-Your-Own-Experiments 2

Tagged Division

Division Experimentation & Lab-Oriented Studies

Page Count

13

Page Numbers

26.313.1 - 26.313.13

DOI

10.18260/p.23652

Permanent URL

https://peer.asee.org/23652

Download Count

63

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Paper Authors

biography

Jun Nogami University of Toronto

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Jun Nogami is the Chair of the Department of Materials Science and Engineering at the University of Toronto. He has a strong interest in engineering education that stems from the differences that he has observed in Engineering vs Physics pedagogy.

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biography

Scott Ramsay University of Toronto

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Scott Ramsay is currently a lecturer and Adjunct Professor Scott is currently an Adjunct Professor of Materials Science and Engineering at the University of Toronto, in Toronto, Canada, and a registered professional engineer in Ontario. Scott earned his PhD in Materials Science and Engineering from the University of Toronto in 2007. Scott's current primary academic interests are in improving the quality of undergraduate engineering education through the use of various reusable learning objects. Scott has taught extensively in Material Science, teaching courses ranging from introductory materials science to thermodynamics, diffusion, materials selection, manufacturing, biomaterials, and building science.

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Scott D Ramsay University of Toronto

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Abstract

BYOE: Crystallographic Planes Lab for Introductory Materials Engineering CourseFirst year students often struggle to develop the spatial thinking skills required to understandcrystal structures and crystallographic planes and directions. The experiment presented here isused in a tutorial setting to provide students with hands-on experience building various crystalstructures, exposing various atomic planes, and comparing the three dimensional arrangement ofatoms in various common crystal structures. This experiment is one of four so-called portabletabletop labs (PTLs) that have been developed for use by roughly 2000 first year students acrossa number of engineering disciplines. The portable table-top labs are easily transportable andrequire very little set-up time, thereby facilitating their use in tutorial rooms that may bescattered geographically across campus. The crystal structure PTL includes five small Delrinbases (roughly 10 cm × 10 cm) into which are machined holes corresponding to the positions of5/8” Delrin balls in specific crystallographic planes. Clear acrylic sides are fastened to the basesto constrain the balls, allowing the construction of simple cubic (SC), body centered cubic(BCC), face centered cubic (FCC) and hexagonal close packed (HCP) structures. The clearsides allow students to observe the structures from a range of angles. In addition to these bases,polystyrene models of FCC, SC, and HCP are included in this PTL that can be freely rotated tohelp students compare structures.Pedagogical ContextCrystal structure is a fundamental topic in materials science as it provides a foundation forunderstanding a range of structure-property relationships. Visualization of three-dimensionalstructures and crystallographic directions by first year engineering students often poses achallenge as textbooks and other learning materials can utilize only two dimensional depictions.This tutorial activity allows students to build crystal structures, and to examine and comparethem.ApplicationThrough building and observation of crystal structures, students can better understand a numberof concepts introduced in first year materials science and engineering courses. This activity ismade up of four stations (Figure 1) that each facilitate understanding of different crystalstructures and concepts. The first station challenges students to think about the relativepositioning of atoms and not to be distracted by the borders of the model (Figure 1a). Inaddition, through construction of simple cubic and face centered cubic structures, students canobserve close packed directions and planes. The concept of coordination number can be moreeasily demonstrated through a 3D structure as well. The second station begins with a (110) planefor either simple cubic or FCC and can be used to create either crystal strucutre (Figure 1b).Students typically assume the station 3 base will only allow the creation of an HCP structurehowever FCC can also be created. A stacking fault can be built, demonstrating the flexibility ofthis experiment (Figure 1c). Station 4 allows the creation of the BCC structure and presents agreat opportunity to discuss the coordination number and direction of contact in the hard spheremodel of BCC (Figure 1d). a) b) Figure 1. Three of the five bases used in this experiment. a) b) Figure 2. Some of the structures that can be created using station 3. Students typically assumethe base will only allow the creation of an HCP structure a), however FCC can also be created b). a) b) Figure 3. Station 4 allows the creation of the BCC structure and presents a great opportunity to discuss the coordination number and direction of contact in the hard sphere model of BCC.

Nogami, J., & Ramsay, S., & Ramsay, S. D. (2015, June), BYOE: A Portable Table-top Lab for Exploring Crystal Structures Paper presented at 2015 ASEE Annual Conference & Exposition, Seattle, Washington. 10.18260/p.23652

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