Belik Alexei A, Tsujii Naohito, Suzuki Hiroyuki, Takayama-Muromachi Eiji
Advanced Nano Materials Laboratory (ANML) and Quantum Beam Center, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
Inorg Chem. 2007 Oct 15;46(21):8746-51. doi: 10.1021/ic701099f. Epub 2007 Sep 14.
Single-phased powder BiCrO(3) sample was prepared at 6 GPa and 1653 K. Its magnetic properties were investigated by dc/ac magnetization, magnetic relaxation, and specific heat measurements. Four anomalies of magnetic origin were found near 40, 75, 109, and 111 K. The long-range antiferromagnetic order with weak ferromagnetism occurs at T(N) = 109 K. The ac susceptibilities showed that the transition near T(N) is a two-step transition. Additional frequency-independent broad anomalies were observed on the real part of the ac susceptibilities near 75 K, likely, caused by the change in the magnetic easy axis. The dc magnetic susceptibilities also had anomalies at 75 K, and the isothermal magnetization curves and relaxation curves changed their behavior below 75 K. Below 40 K, frequency-dependent anomalies with very large temperature shifts were observed on both the real and imaginary parts of the ac susceptibilities. The monoclinic-to-orthorhombic structural phase transition near 420 K was investigated by magnetization and differential scanning calorimetry measurements.
在6吉帕斯卡和1653开尔文的条件下制备了单相粉末BiCrO(3)样品。通过直流/交流磁化强度、磁弛豫和比热测量研究了其磁性能。在40、75、109和111开尔文附近发现了四个磁起源异常。在T(N)=109开尔文时出现了具有弱铁磁性的长程反铁磁序。交流磁化率表明，T(N)附近的转变是两步转变。在75开尔文附近的交流磁化率实部上观察到了与频率无关的额外宽异常，可能是由磁易轴的变化引起的。直流磁化率在75开尔文时也有异常，等温磁化曲线和弛豫曲线在75开尔文以下改变了它们的行为。在40开尔文以下，在交流磁化率的实部和虚部都观察到了具有非常大温度漂移的频率相关异常。通过磁化强度和差示扫描量热法测量研究了420开尔文附近的单斜晶系到正交晶系的结构相变。
