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The monoclinic-to-tetragonal phase transformation in II. Experiments and Results LaNbO 4 has been investigated by X-ray diffraction andThe raw materials, La 2 O 3 and Nb 2 O 5 , were supplied by Johndilatometry. Based on the experimental results and theoretson Matthey Electronics. The particle size of La 2 O 3 ranges from ical concerns (Landau theory and thermodynamics), it is 150 to 400 m and that of Nb 2 O 5 from 210 to 250 m. Both suggested that this transformation is second order in were 99.9% pure. nature.Equal atomic amounts of La 2 O 3 and Nb 2 O 5 oxide were mixed, and ball-milled in a medium of small ZrO 2 balls with I. Introduction isopropyl alcohol for 48 h. The ball-milled mixture was dried in an oven at 90ЊC, followed by cold isostatic pressing with a

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