polycrystalline germanium - ορισμός. Τι είναι το polycrystalline germanium
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Τι (ποιος) είναι polycrystalline germanium - ορισμός

PIEZOELECTRIC CERAMIC ELEMENT THAT HAS A NARROW RESPONSE TO A PARTICULAR FREQUENCY
Polycrystalline resonator

Germanium iodides         
DAB OF GERMANIUM(II) AND GERMANIUM(IV) IODIDE
Germanium(II) iodide; Germanium(IV) iodide; Germanous iodide; Germanium iodide; Germanium tetraiodide; Germanium diiodide
Germanium iodide is a chemical compound of germanium and iodine. Two such compounds exist: germanium(II) iodide GeI2 and germanium(IV) iodide GeI4.
Ekasilicon         
  • alt=Skeletal chemical structure of a tetrahedral molecule with germanium atom in its center bonded to four hydrogen atoms. The Ge-H distance is 152.51 picometers.
  • Prediction of germanium, "?=70" (periodic table 1869)
  • alt=Skeletal chemical structures outlining an additive chemical reaction including an organogermanium compound.
  • alt=Photo of a standard transparent plastic bottle.
  • alt=A brown block of irregular shape and surface, about 6 cm in size.
  • Jacket 400 µm
}}
CHEMICAL ELEMENT WITH SYMBOL GE AND ATOMIC NUMBER 32
Element 32; Eka-silicon; Ekasilicon; Basic parameters of germanium; Germanium whisker; Ge (element); Ge diodes; Eka-Silicon; Germanyum; Germanyium; Germanium compounds; Germanium compound; Compounds of germanium; History of germanium
·noun The name of a hypothetical element predicted and afterwards discovered and named germanium;
- so called because it was a missing analogue of the silicon group. ·see Germanium, and ·cf. Ekabor.
germanium         
  • alt=Skeletal chemical structure of a tetrahedral molecule with germanium atom in its center bonded to four hydrogen atoms. The Ge-H distance is 152.51 picometers.
  • Prediction of germanium, "?=70" (periodic table 1869)
  • alt=Skeletal chemical structures outlining an additive chemical reaction including an organogermanium compound.
  • alt=Photo of a standard transparent plastic bottle.
  • alt=A brown block of irregular shape and surface, about 6 cm in size.
  • Jacket 400 µm
}}
CHEMICAL ELEMENT WITH SYMBOL GE AND ATOMIC NUMBER 32
Element 32; Eka-silicon; Ekasilicon; Basic parameters of germanium; Germanium whisker; Ge (element); Ge diodes; Eka-Silicon; Germanyum; Germanyium; Germanium compounds; Germanium compound; Compounds of germanium; History of germanium
[d??:'me?n??m]
¦ noun the chemical element of atomic number 32, a shiny grey semimetal with semiconducting properties. (Symbol: Ge)
Origin
C19: mod. L., from L. Germanus 'German'.

Βικιπαίδεια

Ceramic resonator

A Ceramic Resonator is an electronic component consisting of a piece of a piezoelectric ceramic material with two or more metal electrodes attached. When connected in an electronic oscillator circuit, resonant mechanical vibrations in the device generate an oscillating signal of a specific frequency. Like the similar quartz crystal, they are used in oscillators for purposes such as generating the clock signal used to control timing in computers and other digital logic devices, or generating the carrier signal in analog radio transmitters and receivers.

Ceramic resonators are made of high-stability piezoelectric ceramics, generally lead zirconate titanate (PZT) which functions as a mechanical resonator. In operation, mechanical vibrations induce an oscillating voltage in the attached electrodes due to the piezoelectricity of the material. The thickness of the ceramic substrate determines the resonant frequency of the device.