Structural, magnetic and dielectric properties of terbium doped NiCoX strontium hexagonal nano-ferrites synthesized via micro-emulsion route

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• 作者：Javed Rehman^a ; Muhammad Azhar Khan^a ; ^{azhar.khan@iub.edu.pk" class="auth_mail" title="E-mail the corresponding author} ; Altaf Hussain^a ; F. Iqbal^a ; Imran Shakir^b ; Ghulam Murtaza^c ; Majid Niaz Akhtar^d ; Gulfam Nasar^e ; Muhammad Farooq Warsi^e ; ^{farooq.warsi@iub.edu.pk" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Dielectric properties ; Nano-ferrites ; XRD ; FTIR ; Saturation magnetization ; Coercivity
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：15 May 2016
• 年：2016
• 卷：42
• 期：7
• 页码：9079-9085
• 全文大小：1458 K

文摘

Terbium (Tb) doped X-type hexagonal nano-ferrites Sr₂NiCoTb_xFe_28−xO₄₆ (x=0.00, 0.05, 0.1, 0.15, 0.2) were synthesized via micro-emulsion route. Single phase X-type hexagonal structure was confirmed by X-ray diffraction (XRD) analysis. The crystallite size of the samples was found in the range of 15–25 nm. The bulk density and X-ray density were enhanced while porosity was reduced with the increased Tb³⁺ contents. The development of hexagonal phase was investigated by thermogravimetric analysis. The fourier-transform infrared (FTIR) spectra revealed the formation of spectral bands (metal-oxygen stretching vibration) which confirmed the hexagonal ferrites. The dielectric constant has high value at low frequency and decreased with increased frequency. The dielectric loss is appreciably decreased by the Tb³⁺ incorporation and resonance phenomenon occurred beyond 1.7×10⁹ Hz. The saturation magnetization (76–54 emu/g) and remanance (27–21 emu/g) decreased while coercivity increased (610–747 Oe) by Tb³⁺-incorporation in Sr₂NiCoTb_xFe_28−xO₄₆ ferrite. The values of squareness ratio (0.35–0.39) indicated that Tb-doped samples are single domain while un-doped material is multi domains. These synthesized nano-sized hexagonal ferrites have potential applications in high frequency and recording media devices.