Table 1.

Determined atomic rates of sodium and phosphorous by EDX analysis.

Atomic Ratios	P-0.5PA	P-1PA	P-3PA	P-5PA	P-7PA	P-10PA
Na/%	0.11	0.47	0.69	1.05	0.97	0.89
P/%	0.39	0.55	1.43	1.69	0.98	0.97