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Ch.12 - Solids and Modern Materials
Brown - Chemistry: The Central Science 14th Edition
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoBrown 14th EditionCh.12 - Solids and Modern MaterialsProblema 42a,c
Capitolo 12, Problema 42a,c

Determine if each statement is true or false: (a) Substitutional alloys are solid solutions, but interstitial alloys are heterogenous alloys. (c) The atomic radii of the atoms in a substitutional alloy are similar to each other, but in an interstitial alloy, the interstitial atoms are a lot smaller than the host lattice atoms.

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Understand the concept of substitutional alloys: These are solid solutions where atoms of the solute metal replace atoms of the host metal in the lattice. The atomic radii of the solute and host metals are similar, allowing for substitution without significant distortion of the lattice.
Understand the concept of interstitial alloys: These involve smaller atoms fitting into the interstices (spaces) between the larger host metal atoms in the lattice. The interstitial atoms are significantly smaller than the host atoms, which allows them to fit into the gaps without replacing the host atoms.
Evaluate statement (a): Substitutional alloys are indeed solid solutions because the solute atoms replace host atoms in the lattice, maintaining a uniform structure. Interstitial alloys are not heterogenous; they are also considered solid solutions because the smaller atoms are uniformly distributed within the lattice.
Evaluate statement (c): In substitutional alloys, the atomic radii of the atoms involved are similar, which is necessary for substitution to occur. In interstitial alloys, the interstitial atoms are much smaller than the host lattice atoms, which is why they can fit into the spaces between the host atoms.
Conclude the evaluation: Based on the explanations, statement (a) is false because both substitutional and interstitial alloys are solid solutions. Statement (c) is true because it accurately describes the size relationship between atoms in substitutional and interstitial alloys.

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Substitutional and Interstitial Alloys

Substitutional alloys are formed when atoms of a solute replace or substitute for atoms of a solvent in a metal lattice, resulting in a solid solution. In contrast, interstitial alloys occur when smaller atoms fit into the spaces (interstices) between the larger host atoms. Understanding these definitions is crucial for evaluating the statements regarding the nature of these alloys.
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Atomic Radii and Alloy Formation

The atomic radius refers to the size of an atom, which influences how atoms can pack together in a solid. In substitutional alloys, the atomic radii of the solute and solvent atoms are typically similar, allowing for a uniform structure. Conversely, in interstitial alloys, the interstitial atoms are significantly smaller, which allows them to occupy the spaces between the larger host atoms without disrupting the overall lattice structure.
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Homogeneity vs. Heterogeneity in Alloys

Homogeneous alloys, like substitutional alloys, exhibit a uniform composition and properties throughout the material, while heterogeneous alloys have distinct phases or regions with different compositions. This distinction is important for understanding the physical properties and behaviors of different types of alloys, as it affects their mechanical and thermal characteristics.
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For each of the following alloy compositions, indicate whether you would expect it to be a substitutional alloy, an interstitial alloy, or an intermetallic compound: (a) Fe0.97Si0.03 (b) Fe0.60Ni0.40 (c) SmCo5.

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Determine if each statement is true or false: (b) Substitutional alloys have 'solute' atoms that replace 'solvent' atoms in a lattice, but interstitial alloys have 'solute' atoms that are in between the 'solvent' atoms in a lattice.

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