Cupronickel is a modern copper-based alloy composed of copper and nickel. First used for coinage in 1850, it has maintained a standard composition of 75% copper and 25% nickel. Its silvery appearance made it a durable and attractive choice for coins worldwide.
Objectives
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Understand the composition and historical introduction of cupronickel.
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Compare cupronickel with other copper alloys such as brass, bronze, and billon.
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Analyze XRF spectra of different coins to observe consistency in alloy composition.
Materials
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Samples of coins: Italian 20 cents (1918), U.S. 5 cents (1993), Euro coin (2008).
Lesson Plan
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Introduce the concept of cupronickel as part of the broader family of copper alloys.
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Present historical background and first use in coinage.
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Examine coin samples across different periods and countries.
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Compare XRF spectra to highlight the consistent alloy composition (75% Cu, 25% Ni).
