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An early use of the piezoelectricity of quartz crystals was in phonograph pickups. One of the most common piezoelectric uses of quartz today is as a crystal oscillator. The quartz oscillator or resonator was first developed by Walter Guyton Cady in 1921. [86] [87] George Washington Pierce designed and patented quartz crystal oscillators in 1923.
Fused quartz, fused silica or quartz glass is a glass consisting of almost pure silica (silicon dioxide, SiO 2) in amorphous (non- crystalline) form. This differs from all other commercial glasses, such as soda-lime glass, lead glass, or borosilicate glass, in which other ingredients are added which change the glasses' optical and physical ...
A crystal oscillator is an electric oscillator type circuit that uses a piezoelectric resonator, a crystal, as its frequency-determining element. Crystal is the common term used in electronics for the frequency-determining component, a wafer of quartz crystal or ceramic with electrodes connected to it. A more accurate term for "crystal" is ...
Quartz countertops are composed of crushed quartz crystals, resins, and more pigments. An increasingly popular choice for kitchens, quartz countertops are designed to be durable and resistant to ...
Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO2, commonly found in nature as quartz. [5][6] In many parts of the world, silica is the major constituent of sand.
Quartz clocks and quartz watches are timepieces that use an electronic oscillator regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency, so that quartz clocks and watches are at least an order of magnitude more accurate than mechanical clocks. Generally, some form of digital logic ...
Amethyst is a purple variety of quartz (SiO. 2) and owes its violet color to irradiation, impurities of iron (Fe3+. ) and in some cases other transition metals, and the presence of other trace elements, which result in complex crystal lattice substitutions. [2][3][4] The irradiation causes the iron Fe3+.
Notes and Primary uses 0.032000 Real-time clock, watches; allows binary division to 1 kHz signal (2 5 ×1 kHz). 0.032768 2 15 allows binary division to 1 Hz. Real-time clock, quartz watches and clocks; common low-speed for microcontrollers. Very common. Available as TCXO. [1] 0.038000 Used with FM stereo encoder chip BA1404 and similar. 0.065536
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