, Guangyao Liu, Yonggao Yan, Kevin R. Talley, James A. Kaduk
X-ray structural characterization and X-ray reference powder patterns have been determined for two series of iron- and cobalt-containing layered compounds, namely, (BaxSr1-x)2Co2Fe12O22 (x = 0.2, 0.4, 0.6, 0.8) and (BaxSr1-x)Co2Fe16O27 (x = 0.2, 0.4, 0.6, 0.8). The (BaxSr1-x)2Co2Fe12O22 series of compounds crystallized in the space group of R-3m (No. 166), with Z=3. The structure is essentially that of the Y-type hexagonal ferrite, BaM2+Fe63+O11. The lattice parameters range from a = 5.85915(8) Å to 5.84372(8) Å, and c = 43.4975(9) to 43.3516(9) Å for x = 0.2 to 0.8, respectively. The (BaxSr1-x)Co2Fe16O27 series (W-type hexagonal ferrite) crystallized in the space group of P63/mmc (No. 194), and Z = 2. The lattice parameters range from a = 5.90205(12) Å to 5.8979(2) Å, and c = 32.9002(10) Å to 32.8110(13) Å for x = 0.2 to 0.8. Results of measurements of the Seebeck coefficient and resistivity of these two sets of samples indicated that they are insulators. Powder X-ray diffraction patterns of these two series of compounds have been submitted to be included in the Powder Diffraction File (PDF).
(BaxSr1-x)2Co2Fe12O22, (BaxSr1-x)Co2Fe16O27, Crystal structure, Powder X-ray diffraction patterns