XRD
1/09/91: پذيزشتاريخ 21/08/91تاريخ تصحيح: 11/06/91:دريافت تاريخ
:چکيده Li:Si
Li:Si
XRDd
Li:Sicelref
version3XRDa=b=
Åc= a=b=Åc=
a = b= Å c=°β=A2/n
Cmc21Ccc2
:
CO2
SiO4
SiO4
SiO4LiO4
180°C
XRD
celref version 3
با D5000 (Siemens AG, Munich, Germany )منس يز يپودر xپراش سنج اشعه فازها با استفاده از دستگاه ييشناسا
انجام شد. Cu-Kαاستفاده از تابش
(Li2SiO3)
.
(Li2Si2O5)
Ccc2 t
(nλ =
2dhkl sinθ)
XRD 2θ Δ2θ = 26.84(48 h) − 26.88(96 h) = - 0.04°
Δd = 3.3177 Å (48 h) − 3.3128 Å (96 h) = 0.0049 Å
XRD2θ Δ2θ
= 30.66(72 h) –30.59(120 h) = 0.07° Δd = 2.9190 Å (120 h) − 2.9125 Å (72 h) = 0.065 Å
Li:Si
LiNaSi2O5.2H2O
-
(Δ2θ= 12.77 (48 h) – 12.72 (72 h) =0.05°), (Δd= 6.956 (72 h) – 6.928 (48 h) = 0.028 Å)
XRD
, a = b = c = ° β =
Li:Si
cba cba cba cba
Li2SiO3
Li2Si2O5
LiNaSi2O5.2H2O
x
Li:SiLi:Si
Li:Si
celref version 3
celref version 3
Investigation of lithium silicate compounds stability by means of x-ray
diffraction method (XRD)
Shahin khademinia1, Abdolali Alemi
1, , Mahboubeh Dolatyari
2 and Hossein Moradi
3
1Faculty of chemistry, Department of Inorganic Chemistry, University of Tbriz, Tabriz, Iran
2Laboratory of Nano Photonics & Nano Crystals, School of Engineering-Emerging Technologies, University of
Tabriz, Tabriz, Iran 3Department of Chemistry, University of Azad, Ardabil Branch, Ardabil, Iran
Received: 1 September 2012 Received in revised form: 11 November 2012 Accepted: 21 November 2012
Abstract In this work, the comprision of phase stability of lithium silicates in the ratios of Li:Si 1:2 and 1:3 from
the raw materials of lithium nitrate and silicic acid and in the ratio of Li:Si 1:2 from the raw materials of lithium
sulphate and silicic acid in the temperatures of 48, 72, 96 and 120 h with using x-ray diffraction method was
performed. Also, we calculated inter planar spacing (d) of the synthesized materials with using Braggs equation.
Synthesized materials sizes were calculated via scherrer equation in different phases and in different Li:Si molar
ratios. Cell parameters of lithium metasilicate are a=9.392, b=5.397 and c=4.66 Å and the parameters for
lithium disilicate are a=15.82, b=14.66 and c=4.79Å. Cell parameters of lithium sodium silinaite are a=5.06,
b=8.23 and c=14.38Å with space group of A2/n. Results show that lithium metasilicate and lithium disilicate
have space groups of Cmc21 and Ccc2, respectively.
Keywords: Lithium silicate, Phase stability, Lithium sodium silicate, Cell parameters
Corresponding Author: Faculty of chemistry, Department of Inorganic Chemistry, University of Tbriz, Tabriz, Iran ٭
E-mail address: [email protected]
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