“mica”的概念、定义、翻译、参考文献-科学参考

mica

Chemistry

Any of a group of silicate minerals with a layered structure. Micas are composed of linked SiO₄ tetrahedra with cations and hydroxyl groupings between the layers. The cations between the layers link the layers. The general formula is X₂Y_4–6Z₈O₂₀(OH,F)₄, where X = K,Na,Ca; Y = Al,Mg,Fe,Li; and Z = Si,Al. The three main mica minerals are:
muscovite, KA1₂ (A1Si₃)O₁₀ (OH)₂;
biotite, K(Mg,Fe)₃(AlSi₃O₁₀) (OH)₂;
lepidolite, KLi₂Al (Si₄O₁₀) (F,OH)₂.
Micas have perfect basal cleavage and the thin cleavage flakes are flexible and elastic. Flakes of mica are used as electrical insulators and as the dielectric in capacitors.

Electronics and Electrical Engineering

A naturally occurring mineral that consists of complex aluminium-potassium silicates and has a monoclinic structure; it can therefore be readily cleaved into thin plates. It has a large dielectric constant virtually independent of frequency and retains its properties as an insulator even at very high temperatures. It also has low loss and high dielectric strength and is used as the dielectric material in mica capacitors. It is widely used for electrical insulation because of its unequalled combination of physical and electrical characteristics.

单词	mica
释义	mica Chemistry Any of a group of silicate minerals with a layered structure. Micas are composed of linked SiO₄ tetrahedra with cations and hydroxyl groupings between the layers. The cations between the layers link the layers. The general formula is X₂Y_4–6Z₈O₂₀(OH,F)₄, where X = K,Na,Ca; Y = Al,Mg,Fe,Li; and Z = Si,Al. The three main mica minerals are: muscovite, KA1₂ (A1Si₃)O₁₀ (OH)₂; biotite, K(Mg,Fe)₃(AlSi₃O₁₀) (OH)₂; lepidolite, KLi₂Al (Si₄O₁₀) (F,OH)₂. Micas have perfect basal cleavage and the thin cleavage flakes are flexible and elastic. Flakes of mica are used as electrical insulators and as the dielectric in capacitors. Electronics and Electrical Engineering A naturally occurring mineral that consists of complex aluminium-potassium silicates and has a monoclinic structure; it can therefore be readily cleaved into thin plates. It has a large dielectric constant virtually independent of frequency and retains its properties as an insulator even at very high temperatures. It also has low loss and high dielectric strength and is used as the dielectric material in mica capacitors. It is widely used for electrical insulation because of its unequalled combination of physical and electrical characteristics.
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