Ti-rich double perovskites LnCu3−yTi2−xMn2+x+yO12: ferrimagnetism and magnetoresistance up to room temperature

Seikh, Md. Motin; Caignaert, V.; Sundaresan, A.; De, Chandan; Raveau, B.

doi:10.1039/c4tc00932k

Cited by 12 publications

(16 citation statements)

References 17 publications

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“…Unlike the parent CCTO phase, the ZFC‐FC data sets of MCCTO1 exhibit large thermomagnetic divergence below 100 K and the FC data does not show any peak. Such feature can be related to the phase separation in the doped sample where the manganese doping results in local nonpercolated canted antiferromagnetic state ,. Such spin canting could be at the origin of increased magnetic moment in the doped phase.…”

Section: Resultssupporting

confidence: 79%

“…Unfortunately, the magnetic substitution at the Ti‐site dramatically suppresses the dielectric constant which could be due to the mutually exclusive tendency of the magnetic and electrical ordering parameters ,. On the other hand, the judicial magnetic substitution on the Ti‐site results in the near room temperature ferrimagnetic magnetoresistive phases at the expense of antiferromagnetic state of CaCu 3 Ti 4 O 12 at T N ∼34 K ,…”

Section: Introductionsupporting

confidence: 64%

“…These results indicate the sensitivity of magnetic behavior upon structure and chemical compositions. However, for the bulk phase samples the ZFC‐FC does not show any irreversibility ,. The observed irreversibility in the present case could be related to the particle size of the sample or the complex spin structure of the A‐site when occupied by both Cu and Mn ions .…”

Section: Resultsmentioning

confidence: 96%

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Synthesis, Characterization and Catalytic Activity of Quadruple Perovskite: CaCu_3‐xMn_xTi_4‐xMn_xO₁₂ (x=0, 0.5 and 1.0)

et al. 2018

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We report the low temperature synthesis of nanosized CaCu 3-x Mn x Ti 4-x Mn x O 12 (x = 0, 0.5 and 1.0) quadruple perovskites and their magnetic, dielectric and catalytic performance towards CO oxidation and methanol steam reforming (MSR). Our investigations reveal the pronounced effects of particle size and chemical substitution on all the physical properties reported here. The manganese doped samples exhibit remarkable change in magnetic properties, where antiferromagnetic pristine phase converted to ferrimagnetic phase for x = 1. The dielectric constant values of the cold-pressed nanosized perovskites are~10 3 and follows Maxwell-Wagner type relaxation. This value is about 100 fold lower than that of the bulk samples that has been ascribed to the effect of particle size and the absence of nano-twinning in the material as revealed from HRTEM studies. The doping of manganese further reduces the magnitude of dielectric value, which is the chemical effect. Mndoped samples show greater catalytic activity compared to the pristine sample towards CO oxidation due to a synergistic CuÀMn interaction. The catalytic performance of these oxides for MSR reaction is intriguing. Although the catalyst undergoes decomposition in the MSR atmosphere causing a decrease in methanol conversion during time-on-stream (TOS) tests, the activity can be regenerated by in-situ or ex-situ annealing in air. The notable catalytic activity and reversibility between pristine and decomposed form are very interesting.

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Section: Resultssupporting

confidence: 79%

Section: Introductionsupporting

confidence: 64%

Section: Resultsmentioning

confidence: 96%

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Synthesis, Characterization and Catalytic Activity of Quadruple Perovskite: CaCu_3‐xMn_xTi_4‐xMn_xO₁₂ (x=0, 0.5 and 1.0)

et al. 2018

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“…To develop superior birefringent materials that not only possess a birefringence comparable to α-BBO, but also have extended UV cutoff edges and no phase transitions and are easier to grow, the following strategies have been considered: (1) the (Ba 2 B 6 O 12 ) ∞ double layer in α-BBO is ideal to obtain a large birefringence owing to its enhanced anisotropic polarizability; − (2) small alkali or alkaline earth metals will be beneficial to reinforce the electrostatic force between cations and anionic frameworks, which may in turn eliminate the phase transition exhibited by α-BBO; − (3) small alkali or alkaline earth metals and F atoms with large electronegativity and small radii are beneficial to shift the cutoff edge to the deep UV region. − …”

Section: Introductionmentioning

confidence: 99%

Na₃Ba₂(B₃O₆)₂F: Next Generation of Deep-Ultraviolet Birefringent Materials

Zhang

Pan

et al. 2014

Crystal Growth & Design

175

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Birefringent materials are of great importance in optical communication and the laser industry, as they can modulate the polarization of light. Limited by their transparency range, few birefringent materials, except α-BaB2O4 (α-BBO), can be practically used in the deep ultraviolet (UV) region. However, α-BBO suffers from a phase transition and does not have enough transparency in the deep UV region. By introducing the relatively small alkali metal Na+ cation and the F– anion to keep the favorable structural features of α-BBO, we report a new birefringent crystal Na3Ba2(B3O6)2F (NBBF), which has the desirable optical properties. NBBF not only maintains the large birefringence (Δn = n o – n e = 0.2554–0.0750 from 175 nm to 3.35 μm) and extends its UV cutoff edge to 175 nm (14 nm shorter than α-BBO) but also eliminates the phase transition and has the lowest growth temperature (820 °C) among birefringent materials. These results demonstrate that NBBF is an attractive candidate for the next generation of deep UV birefringent materials.

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“…This observation is in agreement with the reported values of CCTO 0 18,46-50 and it is significantly different from the magnetic ion doping in CCTO 0 . 18,51,52 The low temperature antiferromagnetic behavior of ACCTO1 0 is evidenced from the linear response of magnetization with applied field at 5 K (Fig. 4(c)).…”

Section: Magnetic Propertiesmentioning

confidence: 97%

Citrate combustion synthesized Al-doped CaCu₃Ti₄O₁₂ quadruple perovskite: synthesis, characterization and multifunctional properties

Pal

Dey

Jana

et al. 2020

Phys. Chem. Chem. Phys.

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Ti-rich double perovskites LnCu_3−yTi_2−xMn_2+x+yO₁₂: ferrimagnetism and magnetoresistance up to room temperature

Cited by 12 publications

References 17 publications

Synthesis, Characterization and Catalytic Activity of Quadruple Perovskite: CaCu_3‐xMn_xTi_4‐xMn_xO₁₂ (x=0, 0.5 and 1.0)

Synthesis, Characterization and Catalytic Activity of Quadruple Perovskite: CaCu_3‐xMn_xTi_4‐xMn_xO₁₂ (x=0, 0.5 and 1.0)

Na₃Ba₂(B₃O₆)₂F: Next Generation of Deep-Ultraviolet Birefringent Materials

Citrate combustion synthesized Al-doped CaCu₃Ti₄O₁₂ quadruple perovskite: synthesis, characterization and multifunctional properties

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Ti-rich double perovskites LnCu3−yTi2−xMn2+x+yO12: ferrimagnetism and magnetoresistance up to room temperature

Cited by 12 publications

References 17 publications

Synthesis, Characterization and Catalytic Activity of Quadruple Perovskite: CaCu3‐xMnxTi4‐xMnxO12 (x=0, 0.5 and 1.0)

Synthesis, Characterization and Catalytic Activity of Quadruple Perovskite: CaCu3‐xMnxTi4‐xMnxO12 (x=0, 0.5 and 1.0)

Na3Ba2(B3O6)2F: Next Generation of Deep-Ultraviolet Birefringent Materials

Citrate combustion synthesized Al-doped CaCu3Ti4O12 quadruple perovskite: synthesis, characterization and multifunctional properties

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Ti-rich double perovskites LnCu_3−yTi_2−xMn_2+x+yO₁₂: ferrimagnetism and magnetoresistance up to room temperature

Synthesis, Characterization and Catalytic Activity of Quadruple Perovskite: CaCu_3‐xMn_xTi_4‐xMn_xO₁₂ (x=0, 0.5 and 1.0)

Synthesis, Characterization and Catalytic Activity of Quadruple Perovskite: CaCu_3‐xMn_xTi_4‐xMn_xO₁₂ (x=0, 0.5 and 1.0)

Na₃Ba₂(B₃O₆)₂F: Next Generation of Deep-Ultraviolet Birefringent Materials

Citrate combustion synthesized Al-doped CaCu₃Ti₄O₁₂ quadruple perovskite: synthesis, characterization and multifunctional properties