Table 2. Published Work of Oxides Prepared by Several Methods, Especially Hydrothermal, for Comparable Temperature Range Variation.

				result trend as temperature increases
source	synthesized material	method	temperature range (°C)	particle size	crystallinity
Zhao et al.6	MnO	hydrothermal	100–160	-	increase
Liu et al.7	Mn3O4	hydrothermal	60–180	similar	increase
Wu et al.44	MnO	hydrothermal	100–175	increase	-
Liang et al.45	MnO	hydrothermal, electrolysis	60–150	increase	increase
Haris et al.46	Manganese oxide nanowires	hydrothermal	200–250	increase	increase
Dunne et al.47	Fe2O3	hydrothermal	200–400	increase	-
Liu et al.48	LiMnO4	hydrothermal	70–190	increase	increase
Lester et al.49	Co3O4	hydrothermal	200–430	increase	-
Wang et al.17	Al(OH)(H2BTEC)·(H2O)	hydrothermal	120–240	increase	increase
Malligavathy et al.50	TiO2	hydrothermal	120–180	similar	increase
Xia et al.51	SiOC	solvothermal	140–180	increase	-
Yamada et al.52	BaTiO3	solvothermal	150–200	increase	increase
Lin et al.53	MnxZn1–xFe2O4	solvothermal	160–220	increase	increase
Biswas et al.15	MnS	solvothermal	60–250	increase	increase
this work	Mn3O4	hydrothermal	90–150	decrease	decrease