Optical properties of stannic oxide obtained by 28 GHz microwave irradiation

Masato Iwasaki, Hirotsugu Takizawa, Kyota Uheda, Tadashi Endo

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The effect of 28 GHz microwave irradiation was investigated on the optical properties of stannic oxide (SnO2). During microwave irradiation, the temperature of SnO2 rose rapidly and reached 1400 °C within a few minutes. After microwave irradiation, commercial whitish green SnO2 turned to pale claret one. X-ray diffraction analysis did not reveal any phase changes or differences in lattice parameters as compared with those of SnO2 conventionally heated (1400 °C, 43.2 ks). Diffuse reflectance spectroscopy detected the absorption peak of claret SnO2 obtained by microwave irradiation in the range of 450-650 nm. The same absorption was detected in SnO2 heated conventionally (1400 °C, 0 s), but after annealing the claret sample turned to white one. On the other hand, microwave-irradiated sample maintained the color after long period annealing. From the X-ray photoelectron spectrometry, we found that the binding energy of Sn in claret SnO2 obtained by microwave irradiation shifted to a lower level than that of white SnO2.

Original languageEnglish
Pages (from-to)999-1003
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Issue number9
Publication statusPublished - 2000 Sept

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry


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