20-22 May 2015
Asia/Bangkok timezone
The Centennial Celebration of General Relativity Theory and 80 Years of Thai Physics Graduate

Crystallization and Dielectric Properties of Nd$^{3+}$ Doped Ferroelectric Glass-Ceramics in the Na$_2$O-BaO-Nb$_2$O$_5$-SiO$_2$ System

21 May 2015, 13:00
3h 30m
Board: MNA-32
Poster presentation Material Physics, Nanoscale Physics and Nanotechnology Poster-3

Speaker

Mr Paitoon Boonsong (Advanced Ceramics Laboratory, Ubon Ratchathani University, Ubon Ratchathani, THAILAND 34190)

Description

Ferroelectric glass-ceramics of the Na${}_2$O-BaO-Nb${}_2$O${}_5$-SiO${}_2$ system were obtained from controlled crystallization process performed on the parent glass of composition 20Na${}_2$O-10BaO-30Nb${}_2$O${}_5$-40SiO${}_2$. Nd${}_2$O${}_3$ doping content was varied in the range 0, 0.1 and 0.5 mol%. The glass samples were prepared via a conventional melting method at 1500 $^{\circ}$C in the platinum crucible for 2 hr following by splashed-quenching on the stainless steel plate. Thermal properties of the as-quenched sample were studied by DTA/TG technique and the results showed the possible crystallization peak at 740 $^{\circ}$C and this was selected as the treatment temperature. Heat treatment process was employed for production of glass-ceramic which is performed in the electrical furnace at selected temperature. The obtained glass-ceramic specimens were investigated in terms of the crystalline phase formation, volume fraction, bulk density and dielectric properties. The results of phase identification using XRD revealed that NaNbO${}_3$ and Ba${}_2$NaNb${}_5$O${}_{15}$ were the dominant crystalline phases for all doped samples. The volume fractions of the crystallites are noticeably increased with the Nd${}_2$O${}_3$ content. Bulk densities of the glass-ceramic samples are higher than that of the related as-quenched glass. The dielectric constants measured at room temperature at various frequencies for doped glass-ceramics seemed to be affected by the presence of Nd$^{3+}$ ion.

Primary authors

Dr Anusorn Niyompan (Advanced Ceramics Laboratory, Ubon Ratchathani University, Ubon Ratchathani, THAILAND 34190) Mr Paitoon Boonsong (Advanced Ceramics Laboratory, Ubon Ratchathani University, Ubon Ratchathani, THAILAND 34190)

Co-author

Dr Rungnapa Tipakontitikul (Advanced Ceramics Laboratory, Ubon Ratchathani University, Ubon Ratchathani, THAILAND 34190)

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