期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 125, 期 12, 页码 6749-6757出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.0c10340
关键词
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资金
- Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Government of India [CRG/2018/000520]
- Nanomission council, Department of Science and Technology, India [SR/Nm/Z-07/2015(G)]
- Council of Scientific and Industrial Research (CSIR) [JNC/S0581]
- Welch Foundation [E-1457]
The study investigates the structural, magnetic, and electrical properties of a new family of doubly ordered perovskites NaLnNiWO(6) synthesized under high-pressure and high-temperature conditions. These materials exhibit a unique crystal structure with antiferromagnetic order of Ni2+ ion moments and a polar structure without electric polarization but with dielectric anomalies.
We report the structural, magnetic, and electrical properties of a new family of doubly ordered perovskites NaLnNiWO(6) (Ln = La, Pr, Nd, Sm, Eu, Gd, and Tb), synthesized at high-pressure (4.5 GPa) and high-temperature (1000 degrees C) conditions. These materials crystallize in the monoclinic structure with the polar space group P2(1) as revealed by neutron diffraction (Ln = La), X-ray diffraction, and second-harmonic-generation (SHG) studies. These compounds exhibit a combined layered ordering of A-site cations and rock-salt ordering of B-site cations with octahedral tilting, which breaks the inversion symmetry and results in a polar structure. The magnetic and heat capacity measurements reveal the antiferromagnetic order of Ni2+ ion moments in the temperature range of 23-30 K, depending on the Ln ion. Analysis of neutron powder diffraction data for the La compound reveals that the Ni2+ spins couple antiferromagnetically along the alpha- and c-directions and ferromagnetically along the b-axis, consistent with the propagation vector, k = (1/2, 0, 1/2). In contrast to the compounds with smaller lanthanide ions (Ln = Y, Dy, Ho, and Yb), these compounds do not exhibit measurable electric polarization at T-N but show a dielectric anomaly.
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