Phase transition and electrical properties of strontium orthovanadate

Pati, Biswajit; Choudhary, R. N. P.; Das, Piyush R.

doi:10.1016/j.jallcom.2013.06.050

Cited by 48 publications

(13 citation statements)

References 46 publications

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“…To further study the bulk, grain boundary, electrode polarization, electrical conductivity and relaxation process in the material electric modulus has been analysed. This technique yields a vision into the electrical mechanism appearing in the material as a function of temperature and frequency and also helps us to understand the transport mechanism and the relaxation process in the material [44,45]. The other benefit of such technique is to overcome the electrode effect.…”

Section: Complex Electric Modulus Studiesmentioning

confidence: 99%

Structure, dielectric and electrical properties of relaxor lead-free double perovskite: Nd2NiMnO6

Das

Choudhary

2019

PAC

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In this paper, dielectric relaxor, impedance, AC conductivity and electrical modulus of double perovskite Nd 2 NiMnO 6 , prepared by a solid state reaction method and sintered at 1250°C, have been reported in the wide temperature (25-150°C) and frequency (1 kHz-1 MHz) ranges. From the preliminary X-ray structural analysis, it is found that the structure of the material is monoclinic. In the study of the temperature dependence of the dielectric constant, the relaxor behaviour of the material is observed. Such type of behaviour is explained by a modified Curie-Weiss and a Vogel-Fulcher law. By analysing Nyquist plots, the existence of grain and grain boundary effects is established. The non-Debye type of relaxation is investigated by the analysis of complex impedance and the modulus data. From the study of impedance data, it is found that the grain resistance is reduced with the increase in temperature indicating the existence of negative temperature coefficient of resistance (NTCR) behaviour in the material which also matches with temperature versus AC conductivity plots. From these results, it may be concluded that this compound may have extreme potential for different high temperature applications.

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Section: Complex Electric Modulus Studiesmentioning

confidence: 99%

Structure, dielectric and electrical properties of relaxor lead-free double perovskite: Nd2NiMnO6

Das

Choudhary

2019

PAC

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“…Moreover, a previous work shows that SVO thin‐films giving the best electrical properties presented a surface covered with strongly oriented and well‐crystallized Sr 3 V 2 O 8 nanorods on top . These nanostructures are sooner found to be insulating, regarding from other works on the dielectric properties on ceramic pellets of Sr 3 V 2 O 8 ,. Indeed, they lead to SVO thin‐films with an excessively high roughness which is not desirable since a smooth and stable thin‐film onto a single phase of SVO is required for future device integration.…”

Section: Introductionmentioning

confidence: 99%

“…[10] These nanostructures are sooner found to be insulating, [33] regarding from other works on the dielectric properties on ceramic pellets of Sr 3 V 2 O 8 . [34,35] Indeed, they lead to SVO thin-films with an excessively high roughness which is not desirable since a smooth and stable thin-film onto a single phase of SVO is required for future device integration. One first solution to prevent SVO thin-films from nanostructures growth was to shut [ down the oxygen partial pressure when the substrate is cooling down inside the PLD chamber.…”

Section: Introductionmentioning

confidence: 99%

Surface Characterizations and Selective Etching of Sr‐Rich Segregation on Top of SrVO₃ Thin‐Films Grown by Pulsed Laser Deposition

et al. 2019

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Since SrVO3 (SVO) can be used as a highly conductive material for perovskite heterostructures, the control of surface morphology and chemistry of such thin‐films are essential. Using pulsed laser deposition, two distinct topographies can be produced. Thus, by tuning oxygen pressure in the growth chamber during cooling, smooth or partially covered by self‐oriented Sr3V2O8 nanorods surfaces can be grown. This study manages to correlate the two typical topographies, revealed by atomic force microscopy (AFM), with their chemical compositions obtained by X‐ray photoelectron spectroscopy (XPS). At first, a model describes their initial surface chemistry through the Sr/V cationic ratio and the (Sr+V)/Oox ratio. Furthermore, using sputter‐depth profiling, post‐thermal treatments and wet chemical etching, SVO thin‐film chemical compositions are extensively studied. We demonstrate that they are composed of stoichiometric SVO phase covered by Sr‐rich layer on top. Finally, treatment in water for 180 seconds helps to remove Sr‐rich phases. Sr3V2O8 nanorods are found selectively dissolved leaving a surface nano‐imprint. Moreover, on smooth SVO surfaces, a balanced Sr/V cationic ratio of 1.0±0.1 is obtained. These results appear very promising for SVO thin‐films surface preparation and further development as electrodes for electronic devices.

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“…In addition, various structural and impedance studies on this compound have been reported. 22,23 Recently, we reported the structural and electrical properties of Ba 3 V 2 O 8 and Ba 3 Nb 2 O 8 24,25 from this family. Some of the interesting findings from previous experimental analysis of this compound reveal the necessity for further study on this material for possible device applications.…”

Section: Introductionmentioning

confidence: 99%

Pyroelectric Response and Conduction Mechanism in Highly Crystallized Ferroelectric Sr3(VO4)2 Ceramic

Pati

Choudhary

Das

2014

Journal of Elec Materi

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We present a study on the ferroelectric phase transition, pyroelectric properties, and conduction mechanism of highly crystallized strontium orthovanadate (Sr 3 V 2 O 8 ) ceramic, prepared by a solid-state reaction technique. X-ray diffraction studies show the formation of a single-phase compound in trigonal crystal system. Detailed studies of dielectric parameters (e r and tan d) of the compound as a function of temperature and frequency reveal their independence over a wide range of temperature and frequency. An anomaly in e r suggests the possible existence of a ferroelectric-paraelectric phase transition of diffuse type in the material, which is confirmed by electric polarization and pyroelectric studies. The low dielectric loss and moderate relative permittivity make this material (with suitable modifications) a potential candidate for use in microwave applications. The low leakage current and negative temperature coefficient of resistance (NTCR) behavior of the sample have been verified from J-E plots. The nature of the variation of the direct-current (DC) conductivity with temperature confirms the Arrhenius and NTCR behavior of the material.

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Phase transition and electrical properties of strontium orthovanadate

Cited by 48 publications

References 46 publications

Structure, dielectric and electrical properties of relaxor lead-free double perovskite: Nd2NiMnO6

Structure, dielectric and electrical properties of relaxor lead-free double perovskite: Nd2NiMnO6

Surface Characterizations and Selective Etching of Sr‐Rich Segregation on Top of SrVO₃ Thin‐Films Grown by Pulsed Laser Deposition

Pyroelectric Response and Conduction Mechanism in Highly Crystallized Ferroelectric Sr3(VO4)2 Ceramic

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Phase transition and electrical properties of strontium orthovanadate

Cited by 48 publications

References 46 publications

Structure, dielectric and electrical properties of relaxor lead-free double perovskite: Nd2NiMnO6

Structure, dielectric and electrical properties of relaxor lead-free double perovskite: Nd2NiMnO6

Surface Characterizations and Selective Etching of Sr‐Rich Segregation on Top of SrVO3 Thin‐Films Grown by Pulsed Laser Deposition

Pyroelectric Response and Conduction Mechanism in Highly Crystallized Ferroelectric Sr3(VO4)2 Ceramic

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Surface Characterizations and Selective Etching of Sr‐Rich Segregation on Top of SrVO₃ Thin‐Films Grown by Pulsed Laser Deposition