EFFECT OF ADDING BORON ON MORPHOLOGICAL
AND FUNCTIONAL PROPERTIES OF ALUMINUM-YTTRIUM GARNET
ACTIVATED WITH EUROPIUM
G. A. Dosovitskii,
K. B. Bogatov,
P. A. Volkov,
A. L. Mikhlin,
and A. E. Dosovitskii
Translated from Novye Ogneupory, No. 2, pp. 50 – 55, February, 2013.
Original article submitted September 4, 2012.
Coprecipitation is used to synthesize aluminum-yttrium garnet powder, activated with europium and alloyed
with boron. The powder obtained may be used for manufacturing high-temperature functional ceramics. It is
shown that addition of boron leads to intensification of particle growth and an increase in photoluminescence
intensity. This is connected with the effect of boron on powder liquid-phase sintering mechanism.
Keywords: aluminum-yttrium garnet, coprecipitation, nanostructured powder, photoluminescence.
Aluminum-yttrium garnet (AYG) is used extensively for
creating high-temperature heat-resistant functional ceramics.
AYG has a simple chemical composition, exhibits high
chemical and thermal stability, may be prepared by reliable
methods, it is used on an industrial scale, and consists of rel-
atively inexpensive chemical elements. A marked advantage
of AYG is a cubic crystalline structure, which simplifies
preparation of transparent materials based upon it. In particu
lar, transparent ceramic based on AYG is a widespread mate
rial for use in solid-state lasers, and therefore it should be sta
ble at high temperature. It is very important to prepare high
quality ceramic fineness, morphology, phase uniformity and
chemical purity of starting powder. Alloying AYG with
rare-earth ions makes it possible to give material based upon
it luminescent properties . This work is devoted to prepa
ration of AYG alloyed with Eu
A classical most widespread method for preparing AYG
powder is solid-phase synthesis ; this method may be used
to prepare powder with a particle size of about 10 mm. Cur
rently there is considerable interest in nanodispersed pow
ders for use as starting material for manufacturing transpar
ent high-temperature ceramics and as a independent func
tional material. AYG:Eu with particle size consisting of tens
to hundreds of nanometers, has been synthesized by various
methods: by classical or modified sol-gel technology [3 – 6],
combustion [7, 8], synthesis in molten salt , synthesis in
an aqueous medium under ultracritical conditions in an auto-
clave , and coprecipitation from aqueous solution .
In our opinion the coprecipitation method is most suitable for
an industrial scale of the process due to its technological sim-
Use of fluxes in synthesis in order to improve powder
functional properties, in particular AYG, is well known in
technology . As a rule fluxes are used in order to prepare
luminophores by solid-phase synthesis. In  the effect of
to a luminophore based on AYG:Ce
with a particle size of about 10 mm, synthesized by
coprecipitation, has been studied. Flux was added to product
precipitated and calcined at 600°C, and an insignificant in
crease in luminophore luminance was observed.
In this work in the preparation stage addition of
was used for synthesizing nanodispersed powder
based on AYG:Eu. The effect of adding boric acid on phase
composition, morphology, and luminance properties of the
powder obtained was studied.
AYG:Eu powder was prepared by coprecipitation from a
solution of Y, Al, and Eu nitrates. The source of Y and Eu
was oxides Y
with a purity of 99.99% and Eu
purity of 99.9%. Oxides were dissolved in chemically pure
nitric acid. The Al source was pure aluminum nitrate dis
solved in distilled water. Solution was purified to a level of
Refractories and Industrial Ceramics Vol. 54, No. 1, May, 2013
1083-4877/13/05401-0069 © 2013 Springer Science+Business Media New York
FGUP State Scientific Research Institute of Chemical Reagents
and Specially Pure Chemical Substances, Moscow, Russia.