Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 12, pp. 1827−1831.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © S.M. Masloboeva, G.I. Kadyrova, V.Ya. Kuznetsov, O.A. Zalkind, L.G. Arutyunyan, 2012, published in Zhurnal Prikladnoi Khimii,
2012, Vol. 85, No. 12, pp. 1938−1943.
AND INDUSTRIAL INORGANIC CHEMISTRY
Synthesis and Research of Phase Composition
of Alloys Nb
S. M. Masloboeva, G. I. Kadyrova, V. Ya. Kuznetsov, O. A. Zalkind, and L. G. Arutyunyan
Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw, Kola Scientiﬁ c Center,
Russian Academy of Sciences, Apatity, Russia
e-mail: soﬁ email@example.com
Received March 1, 2012
Abstract—The conditions were studied for the synthesis of niobium and tantalum pentoxide containing iron
impurity introduced into the strip liquor after extraction separation of niobium and tantalum and subsequent pre-
cipitation of metal hydroxides with ammonia. A phase composition of the synthesized alloys was examined by
X-ray diffraction and infrared spectroscopy.
Lithium niobate (LN) and tantalate (LT) are the
most important ferroelectric materials which due to
their properties are applied to devices of holographic
data recording, electro-optic modulation of the laser
radiation, optical harmonic generation, manufacturing
piezoelectric transducers, creation of photonic crystals
[1–2]. Optical inhomogeneities caused by both their
own and impurity defects signiﬁ cantly limit their use.
Therefore, modiﬁ cation of the properties of LiNbO
by introducing small amounts of a photorefractive
(Fe, Cu, Mn, Ni, etc.) and nonphotorefractive (Mg, B,
Zn, Gd, etc.) impurities is topic of the day.
In photorefractive crystals both images and
holograms can be recorded usually with the use of
laser radiation . A signiﬁ cant improvement in the
parameters of holograms in crystals LN is observed on
doping them by ions of Fe
, which leads to an increase
in the sensitivity by more than two orders of magnitude
. Doping of LiNbO
crystals by Fe
the photorefractive effect, i.e. causes an altering the
refractive index induced by light. Literature data on
the dependence of the electric and optical properties
of doped and nominally pure single crystals of LN and
LT on the composition does not always agree with each
other, as the test samples were obtained by different
authors and produced by different methods. However, in
all cases the method of introducing iron dopant is to add
it to alloy in the form of oxide.
The purpose of this paper is to examine the conditions
for synthesis of niobium and tantalum pentoxide doped
ions in the stage of extraction of niobium
(tantalum)-containing raw material and then using the
as components in the synthesis
of a charge of LN and LT as well as studying their phase
composition at different concentrations of ions Fe
Waste of LN, which is processed by the ﬂ uoride–
hydrochloride technology, was used as a raw material
for niobium pentoxide, [5, 6]. The original solution after
opening the waste had a composition (g L
O 44.0, HCl 92.5, F
96, Fe 0.32, Ta 0.2,
Ti 0.44. A mixture of dimethylamides of carboxylic acids
of fraction C
(DMACA) and octanol-1 (OCL-1)
in the Eskeid diluent was used as extragent. High purity
strips containing 80 g L
and 72 g L
were obtained in the laboratory 16-step extraction setup
of mixer–settler type.
Metal tantalum waste (powder, scrap, plates, etc.),
which was dissolved in concentrated hydroﬂ uoric acid,
was used as a raw material for tantalum pentoxide.
After separation of the undissolved residue we added
sulfuric acid to the solutions, which then we subjected