AC Conductivity and Impedance Properties of 0.65Pb(Mg_1/3Nb_2/3)O₃-0.35PbTiO₃ Ceramics

Table 1

Refined structural parameters of PMN-35PT ceramics using the coexistence model between tetragonal phase (space group P4mm) and monoclinic phase (space group Pm).

	Tetragonal phase (space group P4mm)				Monoclinic phase (space group Pm)
	𝑎=𝑏=3.997(4) Å,𝑐=4.046(1) Å,				𝑎=4.026(9) Å, 𝑏=4.001(6),𝑐=4.052(9) Å,
	𝛼=𝛽=𝛾=90^∘,				𝛼=𝛾=90^∘, and 𝛽=90,60(2)^∘
𝑅wp=9.40%,𝑅exp=5.53%e𝜒^2=2.89
	𝑥𝑇	𝑦𝑇	𝑧𝑇	U (  Ǻ  2)	𝑥𝑀	𝑦𝑀	𝑧𝑀	U (  Ǻ  2)
	0.000	0.000	—	U11 = 31.59(2)	0.028(1)	0.000	0.025(3)	U11 = 80.0(7)
Pb^2+	—	—	0.003(2)	U22 = 31.59	—	—	—	U22 = 79.96
	—	—	—	U33 = 31.59	—	—	—	U33 = 79.96
Ti^4+/	0.500	0.500	0.571(8)	Uiso = 9.0(1)	0.490(5)	0.500	0.539(1)	Uiso = 45.0(5)
Nb^5+	0.500	0,500	0,418(1)	Uiso = 68,7(4)	0,488(5)	0,500	0,542(9)	Uiso = 46,9(21)
Mg^2+	0,500	0.500	0.570(1)	Uiso = 9.0(25)	0.493(6)	0.500	0.537(1)	Uiso = 39.0(13)
O^2−I	0.500	0.500	0.156(5)	Uiso = 8.94(7)	0.496(6)	0.500	0.059(2)	Uiso = 67.0(7)
O^2−II	0.500	0.000	0.553(6)	Uiso = 9.0(7)	0.505(5)	0.000	0.565(1)	Uiso = 29.0(4)
Ratio	67 mol% (Tetragonal)				33 mol% (Monoclinic)