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- Tamman and Hüttig Temperature is an absolute temperature at which atoms in the crystal lattice or on the surface (Hüttig) of a bulk solid material become "loosened" and therefore more reactive or susceptible to a diffusion by other molecules. It's approximately equal to a half (Taumann) and a third (Hüttig) of a compound's absolute melting point. A crystalline lattice of a solid compound maintain constant vibrational motion at normal room temperature and when the temperature increases the amplitude of motion of the ions in the lattice is also increasing until they reach melting point and transition into a liquid phase. At this temperature approximately 70% of ions (atoms) in the lattice have the same freedom of motion that they have at the melting point, therefore allowing for diffusion of other particles, increasing the chances of a chemical reaction. Tamman and Hüttig temperatures are an important factor for some compounds like explosives and fuel oxiders, e.g., potassium chlorate (KClO3) potassium nitrate (KNO3, Tt=31 °C (88 °F)), sodium nitrate (NaNO3, Tt 17 °C (63 °F)) that may react at surprisingly lower temperatures than one would expect. The bulk compounds should be contrasted with nanoparticles that exhibit melting-point depression effect, and therefore significantly lower melting points (as well as lower Tammann and Hüttig temperatures) due to smaller molecular radii. For instance, 2nm Au nanoparticles melt only about 327 °C (621 °F) contrasting to 1,065 °C (1,949 °F) for a bulk Au. This notion is important in regards to sintering process. (en)
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- 8389 (xsd:nonNegativeInteger)
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- Tamman and Hüttig Temperature is an absolute temperature at which atoms in the crystal lattice or on the surface (Hüttig) of a bulk solid material become "loosened" and therefore more reactive or susceptible to a diffusion by other molecules. It's approximately equal to a half (Taumann) and a third (Hüttig) of a compound's absolute melting point. (en)
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- Tamman and Hüttig temperature (en)
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