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5. What do you mean by F-centres?​

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ANSWER:

body { background:linear-gradient(100deg,purple,blue, green,lime,yellow);}div{ box-shadow:0px 0px 20px #000; width:250px; height:auto; position:relative; margin:100px auto; background:#fff; border-radius:10px; font-family:Verdana; color:#333; background-color:red;}p{ padding:50px; padding-top:10px; text-align:justify; color:red;}h1{ background:#b71540; display:inline-block; color:#fff; padding:5px 25px; position:relative; left:-30px; border-bottom-left-radius:5px;}h1:before{ position:absolute; content:''; width:50px; height:50px; background:#b71540; top:20px; left:10px; transform:rotate(45deg); z-index:-1;} An F-center, Farbe center or color center (from the original German Farbzentrum, where Farbe means color and zentrum means center) is a type of crystallographic defect in which an anionic vacancy in a crystal lattice is occupied by one or more unpaired electrons


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