Citation:
	            
		            Zhao  Liang-Zhong. The Cu-O Bond Type and Partial Charge on Oxygen in High-Tc Superconductors[J]. Acta Physico-Chimica Sinica,
							;1995, 11(11): 1053-1056.
						
							doi:
								10.3866/PKU.WHXB19951119
						
					
				
					
				
	        
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The Cu2p XPS satellites of high-Tc superconductors are compared with one of the Cu2+-containing compounds with different bonding type. The results show that Cu-O bonds in high-Tc superconductors are a blend of covalent and ionic. The contribution of covalent bonding to Cu-O bonds is greater for high-Tc superconductors than for CuO. The average partial charge on oxygen (-δO) are calculated for a number of high-Tc superconductors. A correlation between Tc and -δO has been found, i.e. the Tc increases with decreasing –δO.
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								Keywords:
								
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High-Tc Superconductors
, - Chemical bonds,
 - Atomic charge
 
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