Impact of Ba/Ti ratio on the magnetic properties of BaTiO3 ceramics

Rubavathi, P. Esther; Babu, M. Veera Gajendra; Bagyalakshmi, B.; Venkidu, L.; Dhayanithi, D.; Giridharan, N. V.; Sundarakannan, B.

doi:10.1016/j.vacuum.2018.10.063

Cited by 24 publications

(6 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…52 Recently, Rubavathi et al investigated the influence of the Ba/Ti ratio on the exhibition of weak ferromagnetism in BTO and found that the Ti-deficient sample with a Ba/Ti ratio greater than one exhibits weak ferromagnetism. 53 In the present study, BTO samples having an average particle size of 60 nm were used for making ME composites, which show a diamagnetic nature (see the plot labelled as BTO in Fig. S3, ESI †).…”

Section: Magnetic Measurementsmentioning

confidence: 99%

“…As a consequence, there is a chance of the formation of weak ferromagnetism in BTO present in the ME composites. 53 Hence, in order to find out the reason for the observation of the unusual nature of increasing H C with the increment of the BTO content, a detailed magnetic study of BTO nanoparticles ground for different durations is necessary. The BTO nanoparticles were ground for different durations, 10 minutes, 30 minutes and 60 minutes, and these samples are labelled as BTO 10, BTO 30, and BTO 60, respectively.…”

Section: Magnetic Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Exchange-spring mechanism and Griffiths-like phase in room-temperature magnetoelectric Ni–BaTiO₃ composites

et al. 2021

View full text Add to dashboard Cite

show abstract

Section: Magnetic Measurementsmentioning

confidence: 99%

Section: Magnetic Measurementsmentioning

confidence: 99%

Exchange-spring mechanism and Griffiths-like phase in room-temperature magnetoelectric Ni–BaTiO₃ composites

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Further, the 6H-type BaFeO3-δ was reported to show a strong magnetodielectric (MD) effect which arises due to negative magnetoresistance and the Maxwell-Wagner interfacial effects [30]. Recently, Rubavathi et al observed MD effect in Fe substituted BaTiO3 even at lower concentrations (5% and 10% Fe) [31]. It was reported that the partial substitution of Ti +4 in BaFeO3-δ increases Fe +4 concentration and oxygen stoichiometry and hence, enhances the FM ordering [30].…”

Section: Introductionmentioning

confidence: 99%

Correlations between the structural, magnetic, and ferroelectric properties of BaMO3: M = Ti1-x(Mn/Fe)x compounds: A Raman study

Poojitha

Kumar

Rathore

et al. 2020

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Multiferroics possess two or more switchable states such as polarization, magnetization, etc.Phonon excitations in multiferroic phase are strongly modified by magnetoelectric coupling, spin-phonon coupling, and anharmonic phonon-phonon interactions. Here, we have investigated the correlation between phonons and multiferroic order parameters in hexagonal BaMO3: M = Ti1-x(Mn/Fe)x systems using powder x-ray diffraction (PXRD), Raman spectroscopic, and magnetic measurements. The structural transformation from a polar tetragonal to a non-polar 6H-type hexagonal phase is observed as a function of doping (Mn/Fe). Magnetic measurements reveal that the BaTi1-xMnxO3 is paramagnetic while BaTi1-xFexO3 exhibits composition-dependent ferromagnetic order. Importantly, Anomalous temperature-dependence is observed for two phonons (E1g at ~ 152 cm -1 and A1g at ~ 636 cm -1 ) in both the systems exhibiting similar trend with the doping (Mn/Fe) irrespective of the differences in their magnetic ground state. Hence, we attribute the phonon anomalies in both the (Fe/Mn doped) systems to strong anharmonic phonon-phonon interactions arising from large atomic displacements involved in the vibrations. In addition, we have also observed signatures of correlation of phonons with ferroelectric phase as well as magnetically ordered state suggesting the presence of a strain-induced magnetoelectric coupling in the doped compounds.

show abstract

“…vacancy i.e. Ti 3+ [39][40][41][42][43]. In view of the literature, the nanosized BTO shows weak FM due to the formation of Ti 3+ , the intrinsic defect [42][43][44][45].…”

Section: Resultsmentioning

confidence: 97%

Impact of Reentrant Ferroelectric-tetragonal Phase on the Structure, Spectral, Electric, Magnetic and Magnetoelectric Properties of Gd3+-Fe3+ Co-substituted BaTiO3 Ceramics

Dhayanidhi

Giridharan

et al. 2021

Preprint

View full text Add to dashboard Cite

The tetragonal reentrant phase conversion (P4mm) is obtained from the phase coexistence of the tetragonal and the non-polar hexagonal phases (P63/mmc) as a structural effect due to Gd substitution in Ba1-yGdyTi1-xFexO3(x=0.05; y=0.005, 0.01 and 0.015) ceramics. The diffraction spots in the SAED patterns and the d-spacing of the HREM lattice fringes mainly evidence the coexistence of the structural phase. Rietveld refinement offers the bond length and the other structural data. Ti presents itself as Ti3+ and Ti4+ whereas Fe presents as Fe2+ and Fe3+, revealed by the XPS spectra. The octahedra partly change to pentahedral due to the creation of the charge compensating the oxygen vacancies and therefore the conversion from tetragonal to hexagonal phase occurs. The EPR feature corresponding to Ti3+ decreases progressively as the Gd content increases, which implies a decrease of the oxygen vacancy concentration. This facilitates reentrant tetragonal phase conversion. The observed ferromagnetic nature originated from the Fe3+-O2--Fe3+ super-exchange and Gd3+-O2--Gd3+ interactions. The artificial single tetragonal phase magnetoelectric Ba0.985Gd0.015Ti0.95Fe0.05O3 material has the excellent magnetoelectric coupling coefficient of 3.74mV/cm.Oe.

show abstract

Impact of Ba/Ti ratio on the magnetic properties of BaTiO3 ceramics

Cited by 24 publications

References 31 publications

Exchange-spring mechanism and Griffiths-like phase in room-temperature magnetoelectric Ni–BaTiO₃ composites

Exchange-spring mechanism and Griffiths-like phase in room-temperature magnetoelectric Ni–BaTiO₃ composites

Correlations between the structural, magnetic, and ferroelectric properties of BaMO3: M = Ti1-x(Mn/Fe)x compounds: A Raman study

Impact of Reentrant Ferroelectric-tetragonal Phase on the Structure, Spectral, Electric, Magnetic and Magnetoelectric Properties of Gd3+-Fe3+ Co-substituted BaTiO3 Ceramics

Contact Info

Product

Resources

About

Impact of Ba/Ti ratio on the magnetic properties of BaTiO3 ceramics

Cited by 24 publications

References 31 publications

Exchange-spring mechanism and Griffiths-like phase in room-temperature magnetoelectric Ni–BaTiO3 composites

Exchange-spring mechanism and Griffiths-like phase in room-temperature magnetoelectric Ni–BaTiO3 composites

Correlations between the structural, magnetic, and ferroelectric properties of BaMO3: M = Ti1-x(Mn/Fe)x compounds: A Raman study

Impact of Reentrant Ferroelectric-tetragonal Phase on the Structure, Spectral, Electric, Magnetic and Magnetoelectric Properties of Gd3+-Fe3+ Co-substituted BaTiO3 Ceramics

Contact Info

Product

Resources

About

Exchange-spring mechanism and Griffiths-like phase in room-temperature magnetoelectric Ni–BaTiO₃ composites

Exchange-spring mechanism and Griffiths-like phase in room-temperature magnetoelectric Ni–BaTiO₃ composites