Malaysian Journal of Analytical Sciences Vol 24 No 5 (2020): 736 - 743

 

 

 

 

FOURIER TRANSFORM INFRARED SPECTROSCOPY AND OPTICAL PROPERTIES OF SAMARIUM DOPED ZINC BOROTELLURITE GLASSES

 

(Inframerah Transformasi Fourier dan Sifat Optik Kaca Samarium didop dengan Zink Borotelurit)

 

Siti Nasuha Mohd Rafien1*, Azman Kasim2, Azhan Hashim2, Wan Aizuddin Wan Razali2, Norihan Yahya2

 

1Faculty of Applied Sciences,

Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia

5Faculty of Applied Sciences,

Universiti Teknologi MARA Pahang, 26400 Jengka, Pahang, Malaysia

 

*Corresponding author:  nasuharafien1@gmail.com

 

 

Received: 13 November 2019; Accepted: 3 September 2020; Published: 12 October 2020

 

 

Abstract

Zinc borotellurite glasses doped with Sm3+ ions of the (70-x)TeO2-20B2O3-10ZnO-xSm2O3 system were prepared by a melt-quenching technique. The values of x varied from 0.0 mol% to 2.5 mol%. The studies on structural and optical characterisation of Sm3+ ions were carried out through Fourier transform infrared spectroscopy (FTIR), absorption spectra, optical band gap (Eopt) and Urbach energy (ΔE) analysis were presented for Sm3+ ions in zinc borotellurite glasses. From the FTIR analysis, the presence of BO3, BO4, TeO3, TeO4 and B – O - structural units in the prepared glasses was investigated. Three strong absorption peaks in the ultraviolet and visible regions were observed from absorption spectra due to transition between the ground state and various excited state of Sm3+ ions.  The value of optical band gap, Eopt laid between 2.605 eV to 2.982 eV for the direct transition, and 2.768 eV to 3.198 eV for indirect transition, respectively. Meanwhile, the Urbach energy (ΔE) was observed in the range of 0.112 eV to 0.694 eV, respectively. Some other results were analysed and discussed in details.

 

Keywords:  optical properties, zinc, borotellurite, absorption spectra

 

Abstrak

Kaca zink borotelurit didop dengan ion Sm3+ dalam sistem (70-x)TeO2-20B2O3-10ZnO-xSm2O3 telah disediakan melalui kaedah konvensional sepuh lindap. Nilai x bervariasi dari 0.0 mol% hingga 2.5 mol%. Kajian terhadap pencirian struktur dan optik ion Sm 3+ telah dilakukan melalui analisis spektroskopi inframerah transformasi Fourier (FTIR), spektrum penyerapan, jurang jalur optik (Eopt) dan tenaga Urbach (ΔE) telah dibentangkan untuk ion Sm3+ dalam kaca zink borotelurit. Dari analisis FTIR, kehadiran struktur unit BO3, BO4, TeO3, TeO4 dan B - O- dalam kaca yang disediakan telah dikaji. Tiga puncak penyerapan yang kuat pada ultraungu dan rantau terlihat telah diamati dari spektra penyerapan kerana transisi antara keadaan dasar dan pelbagai keadaan teruja ion Sm3+. Nilai jurang jalur optik terletak antara 2,605 eV hingga 2,982 eV untuk transisi langsung dan 2,768 eV hingga 3,198 eV untuk transisi tidak langsung. Sementara itu, tenaga Urbach (ΔE) diperhatikan dalam lingkungan 0.112 eV hingga 0.694 eV, masing-masing. Beberapa keputusan lain telah dianalisis dan dibincang secara terperinci.

 

Kata kunci:  sifat optik, zink, borotelurit, spektra penyerapan

 

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