Table 1. Refined Structural Parameters of the Pulverized SrTb₂O₄ Samples I, II, and III from Zones l, m, and n (Figure 2), Respectively, Including Space Group Pnam, Lattice Constants, Unit-Cell Volume, Density (Calculated with the Refinement), Atomic Positions, Isotropic Thermal Parameters (B), and Goodness of Fit^a.

parameter	I	II	III
a (Å)	10.0910(3)	10.0955(5)	10.0983(3)
b (Å)	11.9898(4)	11.9996(7)	11.9998(4)
c (Å)	3.4463(1)	3.4489(2)	3.4506(1)
α(β,γ) (°)	90	90	90
V (Å3)	416.968(25)	417.814(42)	418.132(24)
density (g/cm3)	7.479(1)	7.464(1)	7.458(1)
Sr(4c) x	0.7488(6)	0.7486(5)	0.7493(5)
Sr(4c) y	0.6490(5)	0.6495(4)	0.6494(4)
Sr(4c) z	0.25	0.25	0.25
Sr(4c) B (Å2)	2.47(1)	1.79(1)	2.13(9)
Tb1(4c) x	0.4241(5)	0.4251(4)	0.4242(4)
Tb1(4c) y	0.1111(3)	0.1120(3)	0.1118(3)
Tb1(4c) z	0.25	0.25	0.25
Tb1(4c) B (Å2)	2.55(6)	2.64(6)	2.83(4)
Tb2(4c) x	0.4173(5)	0.4184(4)	0.4184(4)
Tb2(4c) y	0.6124(3)	0.6119(3)	0.6116(3)
Tb2(4c) z	0.25	0.25	0.25
Tb2(4c) B (Å2)	2.55(6)	2.64(6)	2.83(4)
O1(4c) x	0.2187(3)	0.2233(3)	0.2249(3)
O1(4c) y	0.1891(2)	0.1694(2)	0.1856(2)
O1(4c) z	0.25	0.25	0.25
O1(4c) B (Å2)	0.83(3)	2.64(3)	2.16(2)
O2(4c) x	0.1318(2)	0.1467(2)	0.1493(2)
O2(4c) y	0.4854(2)	0.4730(2)	0.4719(2)
O2(4c) z	0.25	0.25	0.25
O2(4c) B (Å2)	0.83(3)	2.64(3)	2.16(2)
O3(4c) x	0.4780(3)	0.4788(3)	0.4958(3)
O3(4c) y	0.7905(2)	0.8076(2)	0.7949(2)
O3(4c) z	0.25	0.25	0.25
O3(4c) B (Å2)	0.83(3)	2.64(3)	2.16(2)
O4(4c) x	0.3935(2)	0.3867(2)	0.3941(2)
O4(4c) y	0.4018(2)	0.3954(2)	0.4007(2)
O4(4c) z	0.25	0.25	0.25
O4(4c) B (Å2)	0.83(3)	2.64(3)	2.16(2)
Rp	3.87	3.79	3.55
Rwp	4.96	4.84	4.49
Rexp	2.65	3.20	3.10
χ2	3.49	2.28	2.10

^aThe Wyckoff site of each ion was also listed. The numbers in parenthesis are the estimated standard deviations of the last significant digit.