Crystal plane index, corresponding 2θ, and the crystal system of products synthesized at various crystallization times.

Time (h)	0.5	1	2	3	4
(111)	—	—	6.0750	6.0780	6.0957
(220)	—	—	9.9855	9.9493	9.9610
(311)	—	—	—	11.6720	11.6918
(331)	—	—	15.3543	15.3798	15.3967
(440)	—	—	19.9835	20.0101	20.0242
(533)	—	—	23.2126	23.2429	23.2621
(642)	—	—	26.5670	26.5918	26.6048
(751)	—	—	30.8612	30.8770	30.8973
Crystal system	—	—	Cubic	Cubic	Cubic