Crystal Structure, Magnetism, and Dielectric Properties of La1-xBixNi0.5Mn0.5O3
Crystal Structure, Magnetism, and Dielectric Properties of La1-xBixNi0.5Mn0.5O3
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La1-xBixNi0.5Mn0.5O3 的晶体结构、磁性和介电性能
DOI：
10.1143/jpsj.77.084701
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发表时间：
2008
影响因子：
1.7
通讯作者：
K. Asai
中科院分区：
文献类型：
--
作者：
Y. Kobayashi;M. Shiozawa;Keisuke Sato;K. Abe;K. Asai
采用软化学合成法合成了La 1-xBixNi0.5Mn0.5O3（x =0-0.9）多晶材料，并对其晶体结构、磁性和介电性能进行了研究。室温下晶体具有中心对称的单斜P2 1 / c结构（0≤ x ≤ 0.7）和非中心对称的单斜C2结构（0.8 ≤ x ≤ 0.9）。铁磁居里温度（Tcm）从x =0时的300 K单调下降到x =0.9时的150 K，而Ni 2+ -Mn 4+组态与Bi含量无关。当x ≥0.5时，介电常数随温度的升高而反常增加，介电损耗在150 K附近出现最大值，并伴有频率色散，接近于Tcm。然而，没有证据表明铁电有序的观察低于400 K。当x =0.7时，磁场引起的介电常数增量为7%。研究了温度和磁场对晶体结构的影响。
We have synthesized the polycrystalline La 1- x Bi x Ni 0.5 Mn 0.5 O 3 for x =0–0.9 by soft chemical synthesis, and investigated the crystal structure, and the magnetic and the dielectric properties. The crystal has a monoclinic P 2 1 / c structure with centrosymmetry for 0≤ x ≤0.7, and has a monoclinic C 2 structure with non-centrosymmetry for 0.8≤ x ≤0.9 at room temperature. The ferromagnetic Curie temperature ( T CM ) decreases monotonically from 300 K at x =0 to 150 K at x =0.9, while the Ni 2+ –Mn 4+ configuration is kept independent of Bi-content. For x ≥0.5, An anomalous increment of the dielectric constant with increasing temperature and the maximum in the dielectric loss accompanied with frequency dispersion were observed around 150 K, which is close to T CM . However, no evidence showing a ferroelectric ordering was observed below 400 K. For x =0.7, the increment of the dielectric constant induced by the magnetic field is 7% at T CM at 9 T. The temperature and the magnetic field dependence of th...
影响因子：
15
作者：
Azuma, M;Takata, K;Takano, M
通讯作者：
Takano, M