期刊
PHYSICAL REVIEW B
卷 79, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.212415
关键词
bismuth compounds; calcium compounds; doping profiles; electrical conductivity; ferroelectric ceramics; ferroelectric transitions; magnetoelectric effects; multiferroics; Neel temperature
Multiferroic BiFeO3 ceramics have been doped with Ca and it is found that the magnetic Neel temperature (T-Neacuteel) increases as Ca concentration increases, at a rate of 0.66 K per 1% Ca (molar). The smaller ionic size of Ca compared with Bi results in a contraction of the lattice, suggesting that Ca doping can be regarded as a proxy for hydrostatic pressure, with an equivalence of 1% Ca=0.3 GPa. Combining these results, we argue that hydrostatic pressure should increase the magnetic transition temperature of BiFeO3 at a rate around partial derivative T-N/partial derivative P similar to 2.2 K/GPa. Our results also suggest that pressure (chemical or hydrostatic) may be used to bring the ferroelectric critical temperature T-c and the magnetic T-Neacuteel closer together, thereby enhancing magnetoelectric coupling, provided that electrical conductivity can be kept sufficiently low.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据