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In thermodynamics, the enthalpy of sublimation, or heat of sublimation, is the heat required to sublimate (change from solid to gas) one mole of a substance at a given combination of temperature and pressure, usually standard temperature and pressure (STP). It is equal to the cohesive energy of the solid.
J.A. Dean (ed.), Lange's Handbook of Chemistry (15th Edition), McGraw-Hill, 1999; Section 6, Thermodynamic Properties; Table 6.4, Heats of Fusion, Vaporization, and Sublimation and Specific Heat at Various Temperatures of the Elements and Inorganic Compounds
Solid carbon dioxide sublimes rapidly along the solid-gas boundary (sublimation point) below the triple point (e.g., at the temperature of −78.5 °C, at atmospheric pressure), whereas its melting into liquid CO 2 can occur along the solid-liquid boundary (melting point) at pressures and temperatures above the triple point (i.e., 5.1 atm, − ...
A sublimatory [1] [2] or sublimation apparatus is equipment, commonly laboratory glassware, for purification of compounds by selective sublimation. In principle, the operation resembles purification by distillation , except that the products do not pass through a liquid phase .
The most common dyes used for sublimation activate at 350 degrees Fahrenheit / 175 degrees Celsius. However, a range of 380 to 420 degrees Fahrenheit / 195 to 215 degrees Celsius is normally recommended for optimal color. The result of the sublimation transfer process is a nearly permanent, high-resolution, full-color print.
Aluminium nitride is stable at high temperatures in inert atmospheres and melts at about 2,200 °C (2,470 K; 3,990 °F). In a vacuum, AlN decomposes at ~1,800 °C (2,070 K; 3,270 °F). In the air, surface oxidation occurs above 700 °C (973 K; 1,292 °F), and even at room temperature, surface oxide layers of 5–10 nm thickness have been detected.
The source and substrate are then heated. The source is heated to some fraction of its melting temperature, and the substrate some lower temperature e.g. 640 °C and 600 °C, respectively. [2] This causes sublimation of the source, allowing vapors to travel a short distance to the substrate, where they condense, producing a thin film.
Outgassing is a possible source of many tenuous atmospheres of terrestrial planets or moons. [6] Many materials are volatile relative to the extreme vacuum of outer space, and may evaporate or even boil at ambient temperature.
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