Facile and composition controllable synthesis of lanthanum-doped strontium titanate via peroxide route

ABSTRACT

Lanthanum-doped strontium titanate powder, La_0.05Sr_0.95TiO_3+δ, was fabricated by peroxide-based route and calcination of freshly prepared precipitate and precipitate after ageing was carried out. The starting titanium precursor was titanium nitride, which underwent the reaction to form titanium peroxohydroxide and then compound containing strontium and lanthanum. A perovskite structure of strontium titanate with 5 mol-% doped lanthanum was obtained after calcination of the freshly-prepared precipitate at 500°C. However, the ageing powder revealed the presence of the second phase of strontium carbonate after calcination at the same condition. Thermogravimetric results showed that the decomposition of ammonia promoted a reaction to form the pure phase of ceramic oxide only in the freshly calcined sample.

KEYWORDS:

• Strontium titanate
• peroxide-based route
• thermogravimetric analysis

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the Post-doctoral fellowships, Chiang Mai University; and Research and Researchers for Industries (RRI) scholarship.