Synthesis and crystal chemical evolution of fresnoite powders

Chui L. Wong; S. Madhavi; N. Phonthammachai; Timothy J. White

doi:10.1016/j.jssc.2011.12.031

Synthesis and crystal chemical evolution of fresnoite powders

Chui L. Wong, S. Madhavi, N. Phonthammachai, Timothy J. White^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

(Ba,Sr) ₂TiSi ₂O ₈ fresnoite powders were prepared via a Pechini process in which citric acid and ethylene glycol were used as complexing agents. The resulting gel contained a homogeneous distribution of the metal ions that suppressed the formation of (Ba,Sr)TiO ₃ perovskite as a secondary phase during calcination. Phase development was examined as by isochronal and isothermal reaction analysis. A combination of thermo- and differential gravimetric analysis (TGADGA), quantitative X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) confirmed that calcination at 900 °C/12 h yielded finely crystalline (∼70 nm) Ba ₂TiSi ₂O ₈ (BTS) and Sr ₂TiSi ₂O ₈ (STS). The endmembers and compositional intermediates crystallized directly from the Pechini resin and indirectly through reaction of (Ba,Sr)CO ₃, (Ba,Sr)TiO ₃ and a silica-rich glass intermediates. This new method for preparing fresnoite yields materials suitable for consolidation as dense monolithic dielectrics or for use as high surface area catalytic powders.

Original language	English
Pages (from-to)	165-171
Number of pages	7
Journal	Journal of Solid State Chemistry
Volume	187
DOIs	https://doi.org/10.1016/j.jssc.2011.12.031
Publication status	Published - Mar 2012

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@article{803f66902ee24e43a4b2b46e243d4c89,

title = "Synthesis and crystal chemical evolution of fresnoite powders",

abstract = "(Ba,Sr) 2TiSi 2O 8 fresnoite powders were prepared via a Pechini process in which citric acid and ethylene glycol were used as complexing agents. The resulting gel contained a homogeneous distribution of the metal ions that suppressed the formation of (Ba,Sr)TiO 3 perovskite as a secondary phase during calcination. Phase development was examined as by isochronal and isothermal reaction analysis. A combination of thermo- and differential gravimetric analysis (TGADGA), quantitative X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) confirmed that calcination at 900 °C/12 h yielded finely crystalline (∼70 nm) Ba 2TiSi 2O 8 (BTS) and Sr 2TiSi 2O 8 (STS). The endmembers and compositional intermediates crystallized directly from the Pechini resin and indirectly through reaction of (Ba,Sr)CO 3, (Ba,Sr)TiO 3 and a silica-rich glass intermediates. This new method for preparing fresnoite yields materials suitable for consolidation as dense monolithic dielectrics or for use as high surface area catalytic powders.",

keywords = "Ba TiSi O, Fresnoite, Pechini process, Sr TiSi O",

author = "Wong, {Chui L.} and S. Madhavi and N. Phonthammachai and White, {Timothy J.}",

year = "2012",

month = mar,

doi = "10.1016/j.jssc.2011.12.031",

language = "English",

volume = "187",

pages = "165--171",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

publisher = "Academic Press Inc.",

}

TY - JOUR

T1 - Synthesis and crystal chemical evolution of fresnoite powders

AU - Wong, Chui L.

AU - Madhavi, S.

AU - Phonthammachai, N.

AU - White, Timothy J.

PY - 2012/3

Y1 - 2012/3

N2 - (Ba,Sr) 2TiSi 2O 8 fresnoite powders were prepared via a Pechini process in which citric acid and ethylene glycol were used as complexing agents. The resulting gel contained a homogeneous distribution of the metal ions that suppressed the formation of (Ba,Sr)TiO 3 perovskite as a secondary phase during calcination. Phase development was examined as by isochronal and isothermal reaction analysis. A combination of thermo- and differential gravimetric analysis (TGADGA), quantitative X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) confirmed that calcination at 900 °C/12 h yielded finely crystalline (∼70 nm) Ba 2TiSi 2O 8 (BTS) and Sr 2TiSi 2O 8 (STS). The endmembers and compositional intermediates crystallized directly from the Pechini resin and indirectly through reaction of (Ba,Sr)CO 3, (Ba,Sr)TiO 3 and a silica-rich glass intermediates. This new method for preparing fresnoite yields materials suitable for consolidation as dense monolithic dielectrics or for use as high surface area catalytic powders.

AB - (Ba,Sr) 2TiSi 2O 8 fresnoite powders were prepared via a Pechini process in which citric acid and ethylene glycol were used as complexing agents. The resulting gel contained a homogeneous distribution of the metal ions that suppressed the formation of (Ba,Sr)TiO 3 perovskite as a secondary phase during calcination. Phase development was examined as by isochronal and isothermal reaction analysis. A combination of thermo- and differential gravimetric analysis (TGADGA), quantitative X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) confirmed that calcination at 900 °C/12 h yielded finely crystalline (∼70 nm) Ba 2TiSi 2O 8 (BTS) and Sr 2TiSi 2O 8 (STS). The endmembers and compositional intermediates crystallized directly from the Pechini resin and indirectly through reaction of (Ba,Sr)CO 3, (Ba,Sr)TiO 3 and a silica-rich glass intermediates. This new method for preparing fresnoite yields materials suitable for consolidation as dense monolithic dielectrics or for use as high surface area catalytic powders.

KW - Ba TiSi O

KW - Fresnoite

KW - Pechini process

KW - Sr TiSi O

UR - http://www.scopus.com/inward/record.url?scp=84863419564&partnerID=8YFLogxK

U2 - 10.1016/j.jssc.2011.12.031

DO - 10.1016/j.jssc.2011.12.031

M3 - Article

SN - 0022-4596

VL - 187

SP - 165

EP - 171

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

ER -

Synthesis and crystal chemical evolution of fresnoite powders

Abstract

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