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• W4210361729 abstract "An A-site-ordered quadruple perovskite NdMn 7 O 12 was prepared at high pressure of about 6 ​GPa and high temperature of about 1570 ​K. Its crystal structure was refined from synchrotron X-ray powder diffraction, and it crystallizes in space group I 2/ m at room temperature. One structural phase transition was detected at 664 ​K by differential scanning calorimetry. Three magnetic phase transitions were found in NdMn 7 O 12 at T N1 ​= ​84 ​K, T N2 ​= ​12 ​K, and T N3 ​= ​9 ​K by specific heat and direct current magnetic measurements. Alternating current magnetic measurements revealed additional frequency-dependent features: anomalies near 82 ​K (at H ac ​= ​5 ​Oe), anomalies spanning between T N2 and about 70 ​K with maxima near 17 ​K, and anomalies near 6 ​K. Small kinks were found on dielectric constant at T N1 and T N2 , and much stronger frequency-dependent steps on dielectric constant were observed between 20 and 35 ​K accompanied by sharp dielectric loss peaks; peak shifts followed the activation law. Pyroelectric current measurements did not detect any intrinsic ferroelectric polarization. Magnetic behaviour of NdMn 7 O 12 is more complex than that of other members of the RMn 7 O 12 family (R is a rare-earth cation). NdMn 7 O 12 quadruple perovskite magnanite was prepared using a high-pressure high-temperature method. NdMn 7 O 12 shows a structural phase transition at 664 ​K, and three magnetic transitions at 84 ​K, 12 ​K, and 9 ​K. • A high-pressure high-temperature method was used to prepare NdMn 7 O 12 . • NdMn 7 O 12 shows one structural phase transition at 664 ​K. • NdMn 7 O 12 shows a ferrimagnetic transition at T N1 ​= ​84 ​K. • NdMn 7 O 12 shows additional magnetic transitions at T N2 ​= ​12 ​K and T N3 ​= ​9 ​K. • NdMn 7 O 12 shows unique properties among other members of the RMn 7 O 12 family." @default.
• W4210361729 created "2022-02-08" @default.
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• W4210361729 date "2022-05-01" @default.
• W4210361729 modified "2023-09-23" @default.
• W4210361729 title "Multiple magnetic transitions and complex magnetic behaviour of the perovskite manganite NdMn7O12" @default.
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• W4210361729 doi "https://doi.org/10.1016/j.jssc.2022.122969" @default.
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