The magnetic properties of both the praseodymium-aluminium perovskite PrAlO_3 crystal and its microstructured version in the form of a PrAlO_3-PrAl_{11}O_{18} eutectic have been investigated. It is shown that R\overline{3}c → Imma 205 K first-order and Imma → C 2/m near 150 K second-order phase transitions in a PrAlO_3 single crystal are suppressed after structuring the material and embedding it in a PrAl_{11}O_{18} matrix. This behavior is related to the PrAl_{11}O_{18} matrix, which mechanically hinders expansion of the microrods and in this way suppresses the phase transitions.
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