<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt"><div>Dear all,<br>I am doing a high pressure study on CaO and I want to investigate the bond property under compression. The Born effective tensor of cubic CaO has only one independent component. The Born effective charge for Ca are larger than 2 and increase with pressure. Does this mean the bond become more ionic or more covalent? <br>Any reply will be appreciated.<br>Thanks and regards.<br>Lily<br></div></div><br>
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