a (Å)

c (Å)

V (Å3)

c/a

Crystallite size (nm)

SrFe12O19

5.876

23.031

686.707

3.919

80.77

Sr0.7La0.3Fe12−2xCoxAlxO19

x = 0.0

5.856

22.936

688.498

3.919

58.345

x = 0.2

5.869

22.995

686.086

3.913

65.900

x = 0.4

5.867

22.943

684.758

3.911

61.670

x = 0.6

5.860

22.964

682.798

3.910

59.465

x = 0.8

5.869

23.012

681.155

3.908

56.070

Sr0.7Pr0.3Fe12−2xCoxAlxO19

x = 0.0

5.873

23.034

687.308

3.914

60.825

x = 0.2

5.923

23.076

687.038

3.914

76.640

x = 0.4

5.915

23.047

684.448

3.913

65.985

x = 0.6

5.911

23.027

683.225

3.914

67.210

x = 0.8

5.904

23.035

681.995

3.911

65.000