Table 1. Atomic content, atomic ratios, and apparent densities of CCO@xZnO.

Sample	Atomic content				Atomic ratios		Densities (g cm−3)
	Ca	Co	Zn	O	Ca : Co	Zn : O
CCO	22.62	30.06	0	47.32	0.75	0	3.559
CCO@0.1ZnO	22.26	28.67	0.37	48.70	0.78	0.01	3.729
CCO@0.3ZnO	24.33	27.32	0.45	49.90	0.82	0.02	3.787
CCO@0.5ZnO	23.63	28.32	1.03	47.72	0.83	0.04	3.820
CCO@0.7ZnO	24.44	28.53	1.53	45.50	0.86	0.05	3.827