<abstract xmlns="http://www.w3.org/1999/xhtml">SrLa4Ti5−xSnxO17 (0 ≤ x ≤ 2) ceramics were fabricated through solid state ceramic route and their microwave dielectric properties were investigated in an attempt to tune their temperature coefficient of resonant frequency (τf) to zero. The compositions were sintered to single phase SrLa4Ti5O17 and SrLa4Ti4.5Sn0.5O17 ceramics at x = 0 and x = 0.5, and SrLa4Ti4−xSnxO17 along with a small amount of La2Ti2O7 at x = 1. The major phase observed at x = 2 was La2Ti2O7 but along with SrLa4Ti4SnO17 and SrLa4Ti4O15 as the secondary phases. τf decreased from 117 to 23.0 ppm/°C but at the cost of dielectric constant (εr) and quality factor multiplied by resonant frequency (Qufo) which decreased from 65 to 33.6 and 11150 to 4191 GHz, respectively. The optimum microwave dielectric properties, i.e. τf = 38.6 ppm/°C, εr = 45.5 and Q<italic>u</italic>fo = 7919 GHz, correspond to the SrLa4Ti5−xSnxO17 composition with x = 1.</abstract>

SrLa4Ti5−xSnxO17 (0 ≤ x ≤ 2) ceramics were fabricated through solid state ceramic route and their microwave dielectric properties were investigated in an attempt to tune their temperature coefficient of resonant frequency (τf) to zero. The compositions were sintered to single phase SrLa4Ti5O17 and SrLa4Ti4.5Sn0.5O17 ceramics at x = 0 and x = 0.5, and SrLa4Ti4−xSnxO17 along with a small amount of La2Ti2O7 at x = 1. The major phase observed at x = 2 was La2Ti2O7 but along with SrLa4Ti4SnO17 and SrLa4Ti4O15 as the secondary phases. τf decreased from 117 to 23.0 ppm/°C but at the cost of dielectric constant (εr) and quality factor multiplied by resonant frequency (Qufo) which decreased from 65 to 33.6 and 11150 to 4191 GHz, respectively. The optimum microwave dielectric properties, i.e. τf = 38.6 ppm/°C, εr = 45.5 and Qufo = 7919 GHz, correspond to the SrLa4Ti5−xSnxO17 composition with x = 1.

Raman spectroscopy and microwave dielectric properties of Sn substituted SrLa4Ti5O17 ceramics

Department of Physics, University of Science and Technology Bannu, 28100, KPK,

School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070,

Department of Physics, Islamia College Peshawar, 25120 Peshawar,

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Raman spectroscopy and microwave dielectric properties of Sn substituted SrLaTiO ceramics

SrLa4Ti5−xSnxO17 (0 ≤ x ≤ 2) ceramics were fabricated through solid state ceramic route and their microwave dielectric properties were investigated in an...

x	CT[°C]	ST[°C]	ρ_exp[g/cm³]	ε_r	Q_uf_o [GHz]	τ_f [ppm/°C]
0	1250/6h	1500/4h	5.41	65.0	11150	+118
0.5	1300/6h	1600/4h	5.63	56.2	9450	+54.5
1	1300/6h	1625/4h	5.60	48.2	8278	+35.6
2	1300/6h	1625/4h	5.75	33.8	4345	+21.0

Grain	Sr	La	Ti	Sn
A	1	4.12	4.26	0
B	1	4.10	4.20	0.6
C	2.95	10.17	9.36	1
D	1.35	13.93	15.09	1

Raman spectroscopy and microwave dielectric properties of Sn substituted SrLa₄Ti₅O₁₇ ceramics

Article Category: Research Article

Published Online: Apr 27, 2016

Page range: 1 - 5

Received: Aug 24, 2014

Accepted: Nov 11, 2015

DOI: https://doi.org/10.1515/msp-2016-0005

Keywords
ceramics, microwave properties, Raman spectroscopy, SEM

© Wroclaw University of Technology.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

Fig. 2.

Fig 3.

Fig. 4

Fig. 5

Preparation conditions, apparent densities and microwave dielectric properties of SrLa4Ti5−xSnxO17 (0 ≤ x ≤ 2).

Elemental composition (in moles) calculated from semi-quantitative EDS data of the grains labelled in Fig. 2.

Raman spectroscopy and microwave dielectric properties of Sn substituted SrLa4Ti5O17 ceramics

Article Category: Research Article

Published Online: Apr 27, 2016

Page range: 1 - 5

Received: Aug 24, 2014

Accepted: Nov 11, 2015

DOI: https://doi.org/10.1515/msp-2016-0005

Keywordsceramics, microwave properties, Raman spectroscopy, SEM

© Wroclaw University of Technology.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

Fig. 2.

Fig 3.

Fig. 4

Fig. 5

Preparation conditions, apparent densities and microwave dielectric properties of SrLa4Ti5−xSnxO17 (0 ≤ x ≤ 2).

Elemental composition (in moles) calculated from semi-quantitative EDS data of the grains labelled in Fig. 2.

Raman spectroscopy and microwave dielectric properties of Sn substituted SrLa₄Ti₅O₁₇ ceramics

Keywords
ceramics, microwave properties, Raman spectroscopy, SEM