High-Concentration Na Doping of SrRuO3 and CaRuO3

详细信息    查看全文

• 作者：Hayato Seki ; Ryuta Yamada ; Takashi Saito ; Brendan J. Kennedy ; Yuichi Shimakawa
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：May 5, 2014
• 年：2014
• 卷：53
• 期：9
• 页码：4579-4584
• 全文大小：281K
• 年卷期：v.53,no.9(May 5, 2014)
• ISSN：1520-510X

文摘

The Na-doped perovskite-structure ruthenates Sr_1鈥?i>xNa_xRuO₃ and Ca_1鈥?i>yNa_yRuO₃ were prepared by high-pressure synthesis, which enables us to go beyond the previously reported Na doping limits and substitute Na for over 50% of the Sr in SrRuO₃ and the Ca in CaRuO₃. Gradual and systematic changes in the crystal structures were observed, and the decreases in the Ru鈥揙 bond lengths confirmed the Na substitution at the A site caused hole doping to Ru⁴⁺ at the B site. In contrast to what has been previously reported, Sr_1鈥?i>xNa_xRuO₃ showed metallic conductivity. Magnetic properties were influenced by the Na substitution, but no long-range antiferromagnetic behavior was observed in Ca_1鈥?i>yNa_yRuO₃.