Dielectric and magnetic properties of (Bi1-xLaxFeO3)(0.5)(PbTiO3)(0.5) ceramics prepared by high energy mechanochemical technique
PBN-AR
Instytucja
Instytut Fizyki Molekularnej Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
JOURNAL OF ELECTROCERAMICS
ISSN
1385-3449
EISSN
1573-8663
Wydawca
SPRINGER
DOI
URL
Rok publikacji
2015
Numer zeszytu
1-4
Strony od-do
33-44
Numer tomu
35
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Pozostali autorzy
+ 3
Słowa kluczowe
en
(Bi1-xLaxFeO3)(0.5)(PbTiO3)(0.5)
Dielectric properties
Magnetic properties
Relaxor-like behavior
Substitutional lattice disorder
Streszczenia
Język
en
Treść
Multiferroic (Bi1-x La (x) FeO3)(0.5)(PbTiO3)(0.5) ceramics with x = 0, 0.1, 0.2, 0.3 and 0.5 was prepared from mechanochemically synthesized nanopowders. The XRD studies revealed the tetragonal structure for x a parts per thousand currency signaEuro parts per thousand 0.2 and rhombohedral for x = 0.5 with mean grain sizes from 15 to 28 nm. Dielectric response of the compounds in the temperature range 125-525 K was found to contain two anomalies: at similar to 400 K attributed to the presence of oxygen vacancies and that below 300 K characteristic of ferroelectric relaxors; the Curie point anomaly was apparent at 500 K only for samples with x = 0.5. Analysis of the low-temperature response enabled us to characterize the relaxor state of the solid solution and to yield information on the decrease in the activation energy of dipole moment flipping in polar nanoregions. Magnetic studies revealed two contributions to the magnetization of the nanoceramics pointing to a coexistence of weak ferromagnetic and antiferromagnetic orderings in the range 4 A center dot 300 K. Low temperature variation of the magnetization in field-cooling and zero-field-cooling conditions revealed spin glass behavior which in (Bi1-xLaxFeO3)(0.5)(PbTiO3)(0.5) is dependent on x. Moreover, a sharp step in magnetization at similar to 250 K was found to be dependent on the La content and related to the A-site distortion leading to a modification of Fe-O-Fe angles and antiferromagnetic coupling between magnetic Fe3+ moments.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
695006
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