Microwave properties of BaFe11Mg2 0 25X2 0 25Ti4 0 25O19 X2 Cu Mn Zn Ni and Co nanoparticles in 0 26 5GHz range

Sözeri, H.; Mehmedi, Z.; ERDEMİ, Hamit; Baykal, A.; Topal, U.; Aktaş, B.

doi:10.1016/j.ceramint.2015.10.065

Microwave properties of BaFe11Mg2 0 25X2 0 25Ti4 0 25O19 X2 Cu Mn Zn Ni and Co nanoparticles in 0 26 5GHz range

Yazarlar (6)

H. Sözeri
Tübitak Ulusal Metroloji Enstitüsü, Türkiye

Z. Mehmedi
Tübitak Ulusal Metroloji Enstitüsü, Türkiye

Prof. Dr. Hamit ERDEMİ Yalova Üniversitesi, Türkiye

A. Baykal
Fatih Üniversitesi, Türkiye

U. Topal
Tübitak Ulusal Metroloji Enstitüsü, Türkiye

B. Aktaş
Gebze Teknik Üniversitesi, Türkiye

Makale Türü	Özgün Makale (SSCI, AHCI, SCI, SCI-Exp dergilerinde yayınlanan tam makale)
Dergi Adı	Ceramics International (Q1)
Dergi ISSN	0272-8842 Dergi Bilgileri (2016)
Dergi Tarandığı Indeksler	SCI-Expanded
Makale Dili	İngilizce	Basım Tarihi	02-2016
Kabul Tarihi	–	Yayınlanma Tarihi	01-02-2016
Cilt / Sayı / Sayfa	42 / 2 / 2611–2625	DOI	10.1016/j.ceramint.2015.10.065
Makale Linki	http://linkinghub.elsevier.com/retrieve/pii/S0272884215019677
UAK Araştırma Alanları	Polimer Bilimi

Özet

The structural, magnetic and microwave properties of cation substituted barium hexaferrite nanoparticles were investigated. Samples having composition of BaFe11Mg0.25²⁺X0.25²⁺Ti0.5⁴⁺O19 (X²⁺=Cu, Mn, Zn, Ni and Co) were synthesized with solid state reaction route and 1 wt% boron was added as a catalyst to initialize the crystal growth. XRD analysis showed that hard hexaferrite phase was successfully obtained. The lattice parameters "a" and "c" are almost the same in all substituted ions except Cu²⁺, in which elongation in c-axis was detected. The highest saturation magnetization occurred in Ni²⁺ and the highest coercivity was observed in Cu²⁺ substituted samples. This was explained by site preferences of cations which has direct influence on strength of Fe-O-Fe superexchange interactions. The both ac (σac) and dc (σdc) conductivities have temperature dependency and vary with substitution of Cu²⁺, Zn²⁺, Co²⁺, Mn²⁺ and Ni²⁺ ions. The maximum ac conductivity was observed as 2.39×10^-6 S cm^-1 in Ni²⁺ substituted sample at 120 °C and at 10 Hz. The increase in dielectric constants (ε', ε'') with variation of substituted divalent ions was explained by reduction of electron hopping between Fe²⁺ and Fe³⁺ ions. The absorbtion of incident microwave occurs at two different frequencies, around 10 and 20 GHz. The reflection loss close to 10 GHz was observed in all samples, whereas Mn, Zn and Ni substituted samples have the secondary reflection minima. The mechanism of reflection loss at low frequency is quarter wave cancellation at matching thickness. And, at high frequency, it is due to the natural resonance and dipole relaxation of fillers. The best absorbtion capability was obtained in Mn²⁺ substituted sample, which has reflection losses of -30 and -29 dB at 9.5 and 19.2 GHz.

Anahtar Kelimeler

Cation substitution | Magnetic measurements | Microwave properties | Nanostructured materials | Solid state reaction

Science Direct

BM Sürdürülebilir Kalkınma Amaçları

Atıf Sayıları
Yöksis	15
Scopus	28

Microwave properties of BaFe11Mg2 0 25X2 0 25Ti4 0 25O19 X2 Cu Mn Zn Ni and Co nanoparticles in 0 26 5GHz range

Dergi Adı	CERAMICS INTERNATIONAL
Kısa Adı	CERAM INT
Yayıncı	ELSEVIER SCI LTD
Açık Erişim	Hayır
ISSN	0272-8842
E-ISSN	1873-3956
Wos Quartile	Q1
Scopus Quartile	Q1
Tarandığı Indeksler	SCIE , Scopus
WoS Kategoriler	MATERIALS SCIENCE, CERAMICS
Scopus Kategoriler	CERAMICS AND COMPOSITES \| ELECTRONIC, OPTICAL AND MAGNETIC MATERIALS \| MATERIALS CHEMISTRY \| PROCESS CHEMISTRY AND TECHNOLOGY \| SURFACES, COATINGS AND FILMS