Microwave Assisted Solvothermal Synthesis of a New Compound, Pyrochlore-Type Sn_(1.24)Ti_(1.94)O_(3.66)(GH)_(1.50)F_(1.42)

摘要

Nanopowder of a new tin(II) titanium(IV) oxide hydroxide fluoride, Sn_(1.24)Ti_(1.94)O_(3.66)(GH)_(1.50)F_(1.42), with the pyrochlore-type structure (cubic a = 10.3777(7) A, space group Fd3m) was prepared at 180 °C and pH 2 by using a microwave assisted solvothermal reaction. The grain size of the nanopowder was 20—30 nm. It decomposed into a mixture of anatase-type and rutile-type Sn_(0.39)Ti_(0.61)O2 at around 400 °C. A single phase of rutile-type Sn_(0.39)Ti_(0.61)O2 (tetragonal a = 4.6805(6), c = 3.0961(4) A, space group P4_2/ mnm) having a grain size of about 100 nm could be obtained by heating Sn_(1.24)Ti_(1.94)O_(3.66)(GH)_(1.50)F_(1.42) at 800 °C.