Structural, magnetic and dielectric properties of Ni doped LiInCr4O8 breathing pyrochlore
Herein, polycrystalline compounds of breathing pyrochlore LiInCr4-xNixO8 (x = 0, 0.1, 0.2, 0.4) were synthesized by the solid state method. Structure, magnetism, and dielectric properties have been investigated with x-ray diffraction, Raman spectroscopy, magnetic susceptibility, isothermal magnetiza...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-04-01
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| Series: | Results in Physics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379722001474 |
| _version_ | 1818774527629328384 |
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| author | Yuan Feng Zewen Zuo Jian Bian Lujun Zhang Junhu Li Yueyang Huang Baolong Fang Hui Liu |
| author_facet | Yuan Feng Zewen Zuo Jian Bian Lujun Zhang Junhu Li Yueyang Huang Baolong Fang Hui Liu |
| author_sort | Yuan Feng |
| collection | DOAJ |
| description | Herein, polycrystalline compounds of breathing pyrochlore LiInCr4-xNixO8 (x = 0, 0.1, 0.2, 0.4) were synthesized by the solid state method. Structure, magnetism, and dielectric properties have been investigated with x-ray diffraction, Raman spectroscopy, magnetic susceptibility, isothermal magnetization, AC impedance, and heat capacity measurements. The mean particle size of the Ni substituted samples decreased from 1.95 μm to 1.22 μm, which is larger than the size determined by the Scherrer formula and the Williamson-Hall method. Raman scattering revealed slightly red-shifted modes Eg, F2g(2), F2g(3), and A1g, which were caused by higher effective atomic mass and increased bond strength. At low temperatures, field cooled and zero field cooled susceptibility measurements, as well as frequency dependent χac data, show a spin-glass type freezing. The resulting Mydosh parameter p of x = 0.4 is 0.01, suggesting the spin glass state. Magnetic measurements exhibit a large negative CW temperature (|θCW| > 290 K), initially decreasing and then increasing at high Ni concentration, in support of the relationship between magnetic interactions and the structural parameters of Cr–Cr spins. Despite the large negative θCW in substituted samples, long-range magnetic order was suppressed at high Ni contents. With increasing nickel concentration, the spin gap gradually vanished, indicating a significant reduction in breathing distortion. The isothermal magnetization at 2 K confirms antiferromagnetic characteristics and weak ferromagnetic components in the substituted samples. When the frequency is increased at room temperature, the dielectric data shows a drop in dielectric constant as well as lower dielectric loss. At low frequencies, interfacial polarization mechanisms play a crucial role. In contrast, at high frequencies, the dielectric constant becomes frequency independent up to ∼ 105 Hz, due to reverse electron motion. The low temperature specific heat behavior implies the good insulator characteristic of LiInCr3.6Ni0.4O8 and a residual entropy feature related to spin-glass type freezing. |
| first_indexed | 2024-12-18T10:42:34Z |
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| id | doaj.art-40feb0f9af33418caa3e4dac092b0c02 |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-12-18T10:42:34Z |
| publishDate | 2022-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-40feb0f9af33418caa3e4dac092b0c022022-12-21T21:10:37ZengElsevierResults in Physics2211-37972022-04-0135105379Structural, magnetic and dielectric properties of Ni doped LiInCr4O8 breathing pyrochloreYuan Feng0Zewen Zuo1Jian Bian2Lujun Zhang3Junhu Li4Yueyang Huang5Baolong Fang6Hui Liu7Anhui Province Key Laboratory of Optoelectric Materials Science and Technology (OEMST), School of Physics and Electronic Information, Anhui Normal University, Wuhu 241002, China; School of Advanced Manufacturing Engineering, Hefei University, Hefei 230601, ChinaAnhui Province Key Laboratory of Optoelectric Materials Science and Technology (OEMST), School of Physics and Electronic Information, Anhui Normal University, Wuhu 241002, ChinaSchool of Advanced Manufacturing Engineering, Hefei University, Hefei 230601, ChinaAnhui Province Key Laboratory of Optoelectric Materials Science and Technology (OEMST), School of Physics and Electronic Information, Anhui Normal University, Wuhu 241002, ChinaAnhui Province Key Laboratory of Optoelectric Materials Science and Technology (OEMST), School of Physics and Electronic Information, Anhui Normal University, Wuhu 241002, ChinaSchool of Advanced Manufacturing Engineering, Hefei University, Hefei 230601, ChinaSchool of Advanced Manufacturing Engineering, Hefei University, Hefei 230601, ChinaSchool of Advanced Manufacturing Engineering, Hefei University, Hefei 230601, China; Corresponding author.Herein, polycrystalline compounds of breathing pyrochlore LiInCr4-xNixO8 (x = 0, 0.1, 0.2, 0.4) were synthesized by the solid state method. Structure, magnetism, and dielectric properties have been investigated with x-ray diffraction, Raman spectroscopy, magnetic susceptibility, isothermal magnetization, AC impedance, and heat capacity measurements. The mean particle size of the Ni substituted samples decreased from 1.95 μm to 1.22 μm, which is larger than the size determined by the Scherrer formula and the Williamson-Hall method. Raman scattering revealed slightly red-shifted modes Eg, F2g(2), F2g(3), and A1g, which were caused by higher effective atomic mass and increased bond strength. At low temperatures, field cooled and zero field cooled susceptibility measurements, as well as frequency dependent χac data, show a spin-glass type freezing. The resulting Mydosh parameter p of x = 0.4 is 0.01, suggesting the spin glass state. Magnetic measurements exhibit a large negative CW temperature (|θCW| > 290 K), initially decreasing and then increasing at high Ni concentration, in support of the relationship between magnetic interactions and the structural parameters of Cr–Cr spins. Despite the large negative θCW in substituted samples, long-range magnetic order was suppressed at high Ni contents. With increasing nickel concentration, the spin gap gradually vanished, indicating a significant reduction in breathing distortion. The isothermal magnetization at 2 K confirms antiferromagnetic characteristics and weak ferromagnetic components in the substituted samples. When the frequency is increased at room temperature, the dielectric data shows a drop in dielectric constant as well as lower dielectric loss. At low frequencies, interfacial polarization mechanisms play a crucial role. In contrast, at high frequencies, the dielectric constant becomes frequency independent up to ∼ 105 Hz, due to reverse electron motion. The low temperature specific heat behavior implies the good insulator characteristic of LiInCr3.6Ni0.4O8 and a residual entropy feature related to spin-glass type freezing.http://www.sciencedirect.com/science/article/pii/S2211379722001474Breathing pyrochloreSpin glassMagnetic susceptibilityFrustration |
| spellingShingle | Yuan Feng Zewen Zuo Jian Bian Lujun Zhang Junhu Li Yueyang Huang Baolong Fang Hui Liu Structural, magnetic and dielectric properties of Ni doped LiInCr4O8 breathing pyrochlore Results in Physics Breathing pyrochlore Spin glass Magnetic susceptibility Frustration |
| title | Structural, magnetic and dielectric properties of Ni doped LiInCr4O8 breathing pyrochlore |
| title_full | Structural, magnetic and dielectric properties of Ni doped LiInCr4O8 breathing pyrochlore |
| title_fullStr | Structural, magnetic and dielectric properties of Ni doped LiInCr4O8 breathing pyrochlore |
| title_full_unstemmed | Structural, magnetic and dielectric properties of Ni doped LiInCr4O8 breathing pyrochlore |
| title_short | Structural, magnetic and dielectric properties of Ni doped LiInCr4O8 breathing pyrochlore |
| title_sort | structural magnetic and dielectric properties of ni doped liincr4o8 breathing pyrochlore |
| topic | Breathing pyrochlore Spin glass Magnetic susceptibility Frustration |
| url | http://www.sciencedirect.com/science/article/pii/S2211379722001474 |
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