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The Structure and Magnetic Properties of New Iridium (IV) Perovskites Sr2LnIrO6 (Ln=Ce, Tb)

โœ Scribed by Daijitsu Harada; Makoto Wakeshima; Yukio Hinatsu

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
134 KB
Volume
145
Category
Article
ISSN
0022-4596

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โœฆ Synopsis

New compounds with the formula Sr 2 LnIrO 6 (Ln โ€ซุโ€ฌ Ce, Sm&Lu) were characterized from X-ray di4raction measurements and magnetic susceptibility measurements in the temperatures between 5 and 300 K. They were determined to have ordered monoclinic perovskite structures with space group P2 1 / n. The oxidation state of iridium is considered to be pentavalent for Sr 2 LnIrO 6 (Ln โ€ซุโ€ฌ Sm&Gd, Dy&Lu), whereas it is tetravalent for Sr 2 LnIrO 6 (Ln โ€ซุโ€ฌ Ce, Tb). The compounds in which the iridium is in the tetravalent state show an antiferromagnetic transition. Sr 2 CeIrO 6 has a transition temperature at 21 K, and Sr 2 TbIrO 6 has two transition temperatures at 25 and 51 K.

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Synthesis, Crystal Structure, Electrical
Synthesis, Crystal Structure, Electrical, and Magnetic Properties of the New Layered Cobalt Oxides (Sr, Ca, Ln)3Co2O6ยฑฮด (Ln=Sm, Eu, Gd, Tb, Dy, Ho, and Y)
โœ K. Yamaura; Q. Huang; R.J. Cava ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 352 KB

New layered Co oxides of nominal formula Sr 2 (Ln 0.8 Ca 0.2 ) Co 2 O 6 (Ln โ€ซุโ€ฌ Sm, Eu, Gd, Tb, Dy, Ho, and Y) are reported. Single-phase polycrystalline samples were obtained at compositions Sr 2 Y 1ุŠx Ca x Co 2.5ุ‰ O 6ุŠ (0.24x40.5; 04 40.24), Sr 2 Y 1ุŠx Ca x Co 3.4ุ‰ 2 O 6ุ‰ (0.24x40.5; 0.624 40.79),