Structural and dielectric properties of Eu3+,B3+ co-doped CoNb2O6 ceramic

Mustafa İlhan; Mete Kaan Ekmekci; Kadir Esmer

Makale detayları

Structural and dielectric properties of Eu3+,B3+ co-doped CoNb2O6 ceramic

Yazarlar:

Mustafa İlhan | Mete Kaan Ekmekci | Kadir Esmer

Yayıncı:

Turkish Chemical Society

Ana Başlıklar:

Crystallography | Inorganic Materials | Physical Properties of Materials

Dergi:

Journal of the Turkish Chemical Society Section A: Chemistry Vol.11 Issue 2, pp.765-774

Belge Tipi:

Makale

Yayın Tarihi:

5/2024

Belge Dili:

İngilizce

Document ID (Org No.):

2001309585

pISSN:

2149-0120

Anahtar kelimeler:

Özet:

 The boron co-doped CoNb2O6:xEu3, yB3 x1, 3, 6, 9, 12 mol, y10 mol ceramics were obtained by the molten salt method, which has advantageous properties such as short reaction time, low sintering temperature, improved homogeneity, and crystallinity. The ceramic samples were examined by structural and dielectric analyses. In X-ray diffractions, the orthorhombic columbite type CoNb2O6 structure was obtained, and also a minor EuNbO4 phase was detected with increasing Eu3 doping concentrations. Additionally, increasing Eu3 concentration led to a slight increase in crystallite size, and two theta peak shifts occurred towards higher angles associated with shrinkage in the lattice or reduction in the lattice constant. In SEM examinations, a slight increase was observed in grain sizes from 1 to 9 mol Eu3 in the range of 1-30 m, while some decrease occurred in grain sizes at 12 mol, and there was an evident increase in plate-shaped and elongated grains. The dielectric constant ε of the ceramic samples increased with increasing Eu3 concentration and reached approximately 35 and 0.24 at 20 Hz for 9 mol Eu3, respectively. The increase in dielectric loss with increasing Eu3 was associated with an increase in ionic conductivity, in which Eu3 substitution does not suppress oxygen vacancies or make them more ordered.

 The boron co-doped CoNb2O6:xEu3, yB3 x1, 3, 6, 9, 12 mol, y10 mol ceramics were obtained by the molten salt method, which has advantageous properties such as short reaction time, low sintering temperature, improved homogeneity, and crystallinity. The ceramic samples were examined by structural and dielectric analyses. In X-ray diffractions, the orthorhombic columbite type CoNb2O6 structure was obtained, and also a minor EuNbO4 phase was detected with increasing Eu3 doping concentrations. Additionally, increasing Eu3 concentration led to a slight increase in crystallite size, and two theta peak shifts occurred towards higher angles associated with shrinkage in the lattice or reduction in the lattice constant. In SEM examinations, a slight increase was observed in grain sizes from 1 to 9 mol Eu3 in the range of 1-30 m, while some decrease occurred in grain sizes at 12 mol, and there was an evident increase in plate-shaped and elongated grains. The dielectric constant ε of the ceramic samples increased with increasing Eu3 concentration and reached approximately 35 and 0.24 at 20 Hz for 9 mol Eu3, respectively. The increase in dielectric loss with increasing Eu3 was associated with an increase in ionic conductivity, in which Eu3 substitution does not suppress oxygen vacancies or make them more ordered.

 The boron co-doped CoNb2O6:xEu3, yB3 x1, 3, 6, 9, 12 mol, y10 mol ceramics were obtained by the molten salt method, which has advantageous properties such as short reaction time, low sintering temperature, improved homogeneity, and crystallinity. The ceramic samples were examined by structural and dielectric analyses. In X-ray diffractions, the orthorhombic columbite type CoNb2O6 structure was obtained, and also a minor EuNbO4 phase was detected with increasing Eu3 doping concentrations. Additionally, increasing Eu3 concentration led to a slight increase in crystallite size, and two theta peak shifts occurred towards higher angles associated with shrinkage in the lattice or reduction in the lattice constant. In SEM examinations, a slight increase was observed in grain sizes from 1 to 9 mol Eu3 in the range of 1-30 m, while some decrease occurred in grain sizes at 12 mol, and there was an evident increase in plate-shaped and elongated grains. The dielectric constant ε of the ceramic samples increased with increasing Eu3 concentration and reached approximately 35 and 0.24 at 20 Hz for 9 mol Eu3, respectively. The increase in dielectric loss with increasing Eu3 was associated with an increase in ionic conductivity, in which Eu3 substitution does not suppress oxygen vacancies or make them more ordered.

 The boron co-doped CoNb2O6:xEu3, yB3 x1, 3, 6, 9, 12 mol, y10 mol ceramics were obtained by the molten salt method, which has advantageous properties such as short reaction time, low sintering temperature, improved homogeneity, and crystallinity. The ceramic samples were examined by structural and dielectric analyses. In X-ray diffractions, the orthorhombic columbite type CoNb2O6 structure was obtained, and also a minor EuNbO4 phase was detected with increasing Eu3 doping concentrations. Additionally, increasing Eu3 concentration led to a slight increase in crystallite size, and two theta peak shifts occurred towards higher angles associated with shrinkage in the lattice or reduction in the lattice constant. In SEM examinations, a slight increase was observed in grain sizes from 1 to 9 mol Eu3 in the range of 1-30 m, while some decrease occurred in grain sizes at 12 mol, and there was an evident increase in plate-shaped and elongated grains. The dielectric constant ε of the ceramic samples increased with increasing Eu3 concentration and reached approximately 35 and 0.24 at 20 Hz for 9 mol Eu3, respectively. The increase in dielectric loss with increasing Eu3 was associated with an increase in ionic conductivity, in which Eu3 substitution does not suppress oxygen vacancies or make them more ordered.

Makale detayları

Structural and dielectric properties of Eu3+,B3+ co-doped CoNb2O6 ceramic

Yazarlar:

Mustafa İlhan | Mete Kaan Ekmekci | Kadir Esmer

Yayıncı:

Turkish Chemical Society

Ana Başlıklar:

Crystallography | Inorganic Materials | Physical Properties of Materials

Dergi:

Journal of the Turkish Chemical Society Section A: Chemistry Vol.11 Issue 2, pp.765-774

Belge Tipi:

Makale

Yayın Tarihi:

5/2024

Belge Dili:

İngilizce

Document ID (Org No.):

2001309585

pISSN:

2149-0120

CoNb2O6

XRD

SEM

Eu3+ doping

dielectric properties

Sayı

Makale detayları

Structural and dielectric properties of Eu3+,B3+ co-doped CoNb2O6 ceramic

Yazarlar: Mustafa İlhan | Mete Kaan Ekmekci | Kadir Esmer

Yayıncı: Turkish Chemical Society

Ana Başlıklar: Crystallography | Inorganic Materials | Physical Properties of Materials

Dergi: Journal of the Turkish Chemical Society Section A: Chemistry Vol.11 Issue 2, pp.765-774

Belge Tipi: Makale

Yayın Tarihi: 5/2024

Belge Dili: İngilizce

Document ID (Org No.): 2001309585

pISSN: 2149-0120

CoNb2O6

XRD

SEM

Eu3+ doping

dielectric properties

Sayı

Yazarlar:

Mustafa İlhan | Mete Kaan Ekmekci | Kadir Esmer

Yayıncı:

Turkish Chemical Society

Ana Başlıklar:

Crystallography | Inorganic Materials | Physical Properties of Materials

Dergi:

Journal of the Turkish Chemical Society Section A: Chemistry Vol.11 Issue 2, pp.765-774

Belge Tipi:

Makale

Yayın Tarihi:

5/2024

Belge Dili:

İngilizce

Document ID (Org No.):

2001309585

pISSN:

2149-0120