Table 4.

Response and Recovery time of as prepared Ce-doped MgFe₂O₄ sensing material.

#	Test gas	Sintering effect (K)	Ce - doping effect
			x = 0.04		x = 0.08		x = 0.12
			Response time (Sec.)	Recovery time (Sec.)	Response time (Sec.)	Recovery time (Sec.)	Response time (Sec.)	Recovery time (Sec.)
1	Acetone		Pellet
		973	21	29	29	51	43	92
		1173	16	24	23	26	29	57
			Thick film
		973	13	20	21	15	20	65
		1173	10	14	14	11	17	27
2	LPG		Pellet
		973	42	31	47	45	51	63
		1173	33	28	34	29	40	37
			Thick film
		973	20	25	37	23	30	42
		1173	16	24	22	19	21	16
3	Ethanol		Pellet
		973	9	20	15	31	38	84
		1173	7	16	13	19	31	50
			Thick film
		973	7	17	11	9	18	57
		1173	5	12	8	7	15	31
4	Ammonia		Pellet
		973	15	35	22	39	29	38
		1173	6	11	16	9	20	8
			Thick film
		973	11	22	15	8	11	21
		1173	7	15	9	5	9	8