Abstract
X-ray diffraction and electron microscopy were used to study the structural states of precursors of borates LuBO3, YBO3, and EuBO3, garnets Lu3Al5O12 and Y3Al5O12, and perovskites LuAlO3 and LaAlO3 prepared by solvent thermolysis from a nitric-acid solution or an ammonium nitrate melt solution of simple oxides and nitrates of rare-earth elements. The precursors are mainly found to be amorphous. In some cases, small amounts of non-reacted initial oxides and nitrates are observed to be in an amorphous matrix.
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