Aurivillius phases of PbBi4Ti4O15 doped with Mn3+ synthesized by molten salt technique: Structure, dielectric, and magnetic properties

Abstract

a b s t r a c tDoping of manganese (Mn 3 þ /Mn 4 þ ) into the Aurivillius phase Pb 1 À x Bi 4 þ x Ti 4 À x Mn x O 15 was carried out using the molten salt technique for various Mn concentrations (x ¼0, 0.2, 0.4, 0.6, 0.8, and 1). Single phase samples could be obtained in the composition range with x up to 0.6 as confirmed by X-ray and neutron diffraction analysis. Dielectric measurements show a peak at 801, 803, 813 and 850 K for samples with x ¼0, 0.2, 0.4, and 0.6, respectively, related to the ferroelectric transition temperature (T c ). The main contribution of the in-plane polarization for x r0.2 which was calculated from the atomic positions obtained by the structure analysis is the dipole moment in the Ti(1)O 6 layer; however, for x Z 0.4 the polarization originates from the dipole moment in the Ti(2)O 6 layer. Mn doping in the Pb 1 À x Bi 4 þ x Ti 4 À x Mn x O 15 does not show any long range magnetic ordering.

Raman scattering study of the effect of A- and B-site substitution on the room-temperature structure of ABi4Ti4O15

“…The peak positions (ω) of all compounds are compared to deduce the chemically induced changes in bond lengths and bond angles. [5]. Raman spectra were collected with a Horiba Jobin-Yvon T64000 triple-grating spectrometer with spectral resolution of ~2 cm -1 and peak-position precision of 0.35 cm -1 , using the 514.5-nm line of an Ar + laser.…”

The influence of Ni-doping concentration on multiferroic behaviors in Bi4NdTi3FeO15 ceramics

“…5 (b), and the outer octahedra are considerably more distorted than the inner octahedral [37]. Zulhadjri [36]. Therefore, it might be inferred that Ni ions substituted for randomly distributed Fe ions are inclined to occupy the center of the inner octahedra in BNTF.…”

“…Therefore some other factors might have to be taken into account. Sharma proposed that the filled or partially filled d-orbitals of transition metal ions could easily hybridize with the O 2p orbitals [35] and this hybridization could lead to high symmetrical octahedra or similar bond length between magnetic ion and oxygen ions at the opposite direction [36]. Fig.…”

Sintesis Senyawa Aurivillius Ca1-xBi3,5+xLa0,5Ti4-xMnxO15: Struktur dan Sifat Dielektrik

“…(1,34 Å) (Shannon, 1976) yang relatif sama dengan jari-jari Bi 3+ (1,37 Å) (Wei et al, 2016) keduanya berkoordinasi 12 dan jari-jari Ti 4+ (0,605 Å) (Shannon, 1976) yang juga relatif hampir sama dengan Mn 3+ (0,645 Å) (Shannon, 1976) (5) x = 0, 0,2, 0,4, dan 0,6 ditunjukan pada Gambar 3. Pada Gambar 3 ini dapat dilihat bahwa morfologinya berbentuk lempengan-lempengan untuk semua sampel yang merupakan ciri khas morfologi dari fasa Aurivillius (Zulhadjri et al, 2011;Diao et al, 2013). suhu kamar.…”

“…Nilai konstanta dielektrik (Gambar 4a) terlihat tinggi hampir untuk semua sampel pada frekuensi rendah. Hal ini sering ditemukan dalam pengukuran konstanta dielektrik akibat terbentuknya lapisan tipis antara elektroda dan permukaan sampel (Zulhadjri et al, 2011). Pada Gambar 4a, konstanta dielektrik sampel terlihat meningkat dengan kenaikan nilai x dan diperkirkan juga terjadinya peningkatan polarisasi dari sampel.…”