Phase stability study of the pseudobinary system Gd2O3-Nd2O3 (T≙1350°C)

• Published in: Journal of thermal analysis and calorimetry Vol. 92; no. 1; pp. 101 - 104
• Main Authors: Costa, G. A., Artini, C., Ubaldini, A., Carnasciali, M. M., Mele, P., Masini, R.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Dordrecht Springer Netherlands 01.04.2008; Springer
• Subjects: Analytical Chemistry; Chemistry; Chemistry and Materials Science; Exact sciences and technology; General and physical chemistry; Inorganic Chemistry; Measurement Science and Instrumentation; Phase equilibria; Physical Chemistry; Polymer Sciences; X-ray diffraction; rare earth sesquioxides; phase stability; Phase diagram; Neodymium Oxides; Phase stability; Lanthanide Compounds; X ray diffraction; Phase equilibrium; Gadolinium Oxides; Pseudobinary system
• ISSN: 1388-6150; 1588-2926; 1572-8943
• DOI: 10.1007/s10973-007-8744-x

The phase stability of the system Gd 2 O 3 -Nd 2 O 3 up to 1350°C was studied. Mixed oxides were synthesized by coprecipitation of mixed oxalates. Depending on the thermal treatment, three possible structures of the oxides, namely the A (hexagonal, P6 3 /mmm), B (monoclinic, C2/m) and C (cubic, Ia3) forms, were obtained. Below 1300°C the system Gd 2 O 3 -Nd 2 O 3 shows three monophasic (A, B and C phase) and three biphasic regions (A+B, B+C and A+C phase). Below 550°C the C phase is stable over the whole composition range. A validation procedure for the existence of the C phase in pure Nd 2 O 3 was also set up.