|
|
Publication
|
| Title of Article |
Characterization and magnetic properties of SrTi1−xNixO3 nanoparticles
prepared by hydrothermal method |
| Date of Acceptance |
10 October 2016 |
| Journal |
| Title of Journal |
Physica B: Condensed Matter |
| Standard |
SCOPUS |
| Institute of Journal |
2016 Elsevier B.V. All rights reserved |
| ISBN/ISSN |
Doi.org/10.1016/j.physb.2016.10.012 |
| Volume |
2017 |
| Issue |
504 |
| Month |
October |
| Year of Publication |
2018 |
| Page |
31-38 |
| Abstract |
SrTi1−xNixO3 (x=0, 0.05, 0.10 and 0.15) nanoparticles were prepared by the hydrothermal method. All asprepared
samples were annealed at 800 °C for 3 h in argon to study the annealing effect on their magnetic
properties. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy
(TEM), X-ray absorption near edge spectroscopy (XANES), X-ray photoelectron spectroscopy (XPS) and
vibrating sample magnetometry (VSM) were used to study the crystalline structure, morphology, oxidation state
and magnetic properties of samples. XRD results indicate a cubic perovskite structure of all samples with the
impurity phase of SrCO3 in all as-prepared samples and Ni metal in annealed samples of x=0.10 and 0.15. SEM
and TEM images confirmed a cubic shape for all samples with decreasing average particle sizes from 136.8 ± 4.7
to 126.2 ± 6.9 nm for annealed samples upon Ni doping. XANES results revealed the existence of Ni metal in
sample of x=0.05 with the oxidation state of +2 for Ni ion in a SrTi0.95Ni0.05O3 sample. XPS results indicated the
promotion of oxygen vacancies. VSM results revealed a paramagnetic behavior at room temperature of all asprepared
samples. Ni-doped samples exhibited ferromagnetic behavior after annealing in argon with the Curie
temperature (TC) above 380 K for a sample with x=0.05 as shown by field cooling (FC) and zero-field cooling
(ZFC) measurements. The room temperature ferromagnetism (RT-FM) of ferromagnetic samples was suggested
to be originated from Ni metal and F-center exchange (FCE) mechanism due to the promotion of oxygen
vacancies in the perovskite structure. |
| Keyword |
Ni-doped SrTiO3, Hydrothermal method, Annealing effect, Magnetic properties |
| Author |
|
| Reviewing Status |
มีผู้ประเมินอิสระ |
| Status |
ตีพิมพ์แล้ว |
| Level of Publication |
นานาชาติ |
| citation |
true |
| Part of thesis |
true |
| Attach file |
|
| Citation |
0
|
|
|
|
|
|
|
|
|
Journal Publication
ไทย