Phys. Rev. 113, 795–800 (1959)Optical Transmission of Heat-Treated Strontium TitanateReceived 18 June 1958; published in the issue dated February 1959 The room-temperature optical transmission spectra of pure and doped SrTiO3 crystals have been studied after heating them in oxygen and vacuum; spectral measurements were made in the quantum energy range from 0.1 to 3.4 ev. A blue color, with strong attendant absorption in the infrared, can be induced in the pure crystals by heating them in vacuum with absorption maxima occurring at 0.9 and 2.9 ev. This induced absorption can be removed by heating the crystals in oxygen. Prolonged heatings of the pure, stoichiometric crystals in oxygen have failed to induce any measurable change in the transmission spectra in the aforementioned energy range. Optical absorption can be induced in iron- and cobalt-doped SrTiO3 crystal samples by heating them in oxygen; this absorption can be removed by heating the crystals in vacuum. The induced absorption occurs primarily at high quantum energies in the spectra of these doped crystals, with maxima occurring at 2.75 and 2.2 ev in the iron-doped samples, and at 3.0 and 2.6 ev in the cobalt-doped samples. It is suggested that the induced absorption observed in the doped crystals involves a controlled change in the valence states of these impurities. © 1959 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRev.113.795
DOI:
10.1103/PhysRev.113.795
PACS:
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.