resumo
The ability of manganese to induce early zircon (ZrSiO4) crystallization is investigated. An assorted range of manganese additions to the ZrO2-SiO2 binary system through a Sol-Gel approach is attempted to achieve ZrSiO4 formation at low temperatures. XRD analysis alongside complementary Rietveld refinement tool has been used to determine the propelling effect of manganese on the low temperature formation of ZrSiO4. The results revealed the ability of 5 wt% manganese to induce the ZrSiO4 formation at 900 degrees C through its occupancy at the ZrO2 lattice. The lattice substitution of Zr4+ by the lower sized Mn2+ and the concomitant lattice distortion of ZrO2 have been determined as the prime reason for manganese to enhance the reaction kinetics with amorphous SiO2 to yield ZrSiO4. Increments in the manganese content beyond 5 wt% are rejected by the ZrO2 lattice, making the excess to crystallize as Mn2O3. The colour change of ZrSiO4 is directly influenced by the manganese content in ZrO2-SiO2 binary system.
palavras-chave
ZIRCONIUM SILICATE; CRYSTAL-STRUCTURE; AMORPHOUS SILICA; ZRO2 POLYMORPH; GEL SYNTHESIS; TEMPERATURE; POWDER; PIGMENTS; RAMAN; STABILIZATION
categoria
Materials Science
autores
Vasanthavel, S; Ezhilan, M; Ponnilavan, V; Ferreira, JMF; Kannan, S
nossos autores
José Maria da Fonte Ferreira
Professor(a) Jubilado(a)agradecimentos
The financial assistance received from Council of Scientific and Industrial Research, CSIR (Reference: 01(2952)/18/EMR-II dated 01.05.2018) India is acknowledged. The facilities availed from Central Instrumentation Facility (CIF) of Pondicherry University is also acknowledged. Dr. S. Vasanthavel acknowledges CSIR, India (Ref. No. 09/559(0121)/18-EMR-I) for Research Associate Fellowship and Mr. V. Ponnilavan acknowledges CSIR, India (Ref. No. 09/559(0114)/16-EMR-I) for Senior Research Fellowship. This work was developed in the scope of the project CICECO Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement.