Table 3.

Zn bond-valence sum (BVS) values calculated using EXAFS Zn-O/N distances (R) of AP and NPP samples for a range of possible Zn coordination numbers (N).^a

	Zn BVS
	N
RZn-O/N(Å)	4	4.5	5	5.5	6
1.97	2.09	2.34	2.58	2.82	3.07
1.98	2.04	2.27	2.51	2.75	2.98
2.00	1.93	2.15	2.38	2.60	2.83
2.03	1.78	1.99	2.19	2.40	2.61

^aBVS values were calculated with Equation 1, using B = 0.37 Å and R₀ = 1.77 Å for Zn-N, 1.704 Å for Zn-O ⁴³. R_Zn-O/N values are from Table 2.