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A thermistor is a semiconductor type of resistor whose resistance is strongly dependent on temperature, more so than in standard resistors. The word thermistor is a portmanteau of thermal and resistor. Thermistors are categorized based on their conduction models. Negative-temperature-coefficient (NTC) thermistors have less resistance at higher ...
Silver sulfide is an inorganic compound with the formula Ag 2 S. A dense black solid, it is the only sulfide of silver. It is useful as a photosensitizer in photography. It constitutes the tarnish that forms over time on silverware and other silver objects. Silver sulfide is insoluble in most solvents, but is degraded by strong acids. Silver ...
In mineralogy, argentite (from Latin argentum ' silver') is cubic silver sulfide (Ag 2 S), which can only exist at temperatures above 173 °C (343 °F), [1] 177 °C (351 °F), [2] or 179 °C (354 °F). [3] When it cools to ordinary temperatures it turns into its monoclinic polymorph, acanthite. [2][3] The International Mineralogical Association ...
Commonly paramorphic after the cubic high-temperature phase ("argentite"), of original cubic or octahedral habit. Acanthite is a form of silver sulfide with the chemical formula Ag 2 S. It crystallizes in the monoclinic system and is the stable form of silver sulfide below 173 °C (343 °F). Argentite is the stable form above that temperature.
Silver compounds. Some silver oxide powder. Silver is a relatively unreactive metal, although it can form several compounds. The common oxidation states of silver are (in order of commonness): +1 (the most stable state; for example, silver nitrate, AgNO 3); +2 (highly oxidising; for example, silver (II) fluoride, AgF 2); and even very rarely +3 ...
Whether silver plating or pure silver, the composite of the metal will tarnish when exposed to air and sulfur. Tarnish is a chemical reaction on the surface of metal (copper, brass, silver, etc.) and causes a layer of corrosion. In the case of silver tarnish, the silver combines with sulfur and forms silver sulfide (Ag 2 S), which is
A positive-temperature-coefficient heating element (PTC heating element), or self-regulating heater, is an electrical resistance heater whose resistance increases significantly with temperature. The name self-regulating heater comes from the tendency of such heating elements to maintain a constant temperature when supplied by a given voltage ...
Silver (II) sulfate. The synthesis of silver (II) sulfate (AgSO 4) with a divalent silver ion instead of a monovalent silver ion was first reported in 2010 [9] by adding sulfuric acid to silver (II) fluoride (HF escapes). It is a black solid that decomposes exothermically at 120 °C with evolution of oxygen and the formation of the pyrosulfate.
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