Optical absorption and reflection spectra of WO3, WO3 : H0, W x Mo1–x O3 : H0, and sub-stoichiometric ternary oxides have been measured. In WO3, the free-carrier absorption at room temperature switches over to small (or intermediate) polaron absorption near 0·7 eV at low temperatures. In fully oxidized ternary oxides doped with hydrogen, quasi-localized charge carriers with optical transition energies between 1·24 and 1·42 eV have been found. Sub-stoichiometric compounds with extended defect structures like crystallographic shear planes or tunnel structure reveal intervalence transitions including Mo5+, W5+, Mo6+ and W6+ states. An energy level scheme is discussed including the effects of metal–hydrogen interaction.

Optical absorption spectra of single crystals and powder specimens of WxMo1-xO3 reveal fundamental absorption edges with gap energies of 2.77 eV (WO3) and 3.05 eV (MoO3). A continuous shift of the absorption edge and a simultanous appearance of absorption tails was found for ternary oxides. A theoretical model is proposed, based on the Anderson-localisation model with potential fluctuations due to tungsten-molybdenum disorder.

physica status solidi (a)Volume 37, Issue 2 p. K187-K191 Short Note Optical and electrical properties of H+ doped WO3 single crystals G. Hoppmann, G. Hoppmann Mineralogisches Institut der Technischen Universität HannoverSearch for more papers by this authorE. Salje, E. Salje Mineralogisches Institut der Technischen Universität HannoverSearch for more papers by this author G. Hoppmann, G. Hoppmann Mineralogisches Institut der Technischen Universität HannoverSearch for more papers by this authorE. Salje, E. Salje Mineralogisches Institut der Technischen Universität HannoverSearch for more papers by this author First published: 16 October 1976 https://doi.org/10.1002/pssa.2210370263Citations: 10AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat References 1 O. Glemser and C. Naumann, Z. anorg. allg. Chem 265, 289 (1951). 2 P. G. Dickens and R. J. Hurditch, Nature (London) 215, 1266 (1967). 3 P. G. Dickens and R. J. Hurditch, The Chemistry of Extended Defects in Non-Metallic Solids, Amsterdam 1970 (p. 555). 4 B. W. Faughnan, R. S. Crandall, and M. A. Lampert, Appl. Phys. Letter 27, 275 (1975). 5 E. Salje, J. appl. Cryst 7, 615 (1974). 6 E. Salje and K. Viswanathan, Acta Cryst A31, 356 (1975). 7 E. Salje, Acta Cryst A31, 360 (1975). 8 E. Salje and H. Hatami, Z. anorg. allg. Chem 396, 267 (1973). 9 S. K. Deb, Phil. Mag 27, 801 (1973). 10 B. W. Brown and E. J. Banks, J. Amer. Chem. Soc 76, 963 (1954). 11 L. D. Muhlestein and G. C. Danielson, Phys. Rev 158, 825 (1967). 12 E. Salje, to be published. 13 B. L. Crowder and M. J. Sienko, J. chem. Phys 38, 1576 (1963). 14 J. M. Berak and M. J. Sienko, J. Solid State Chem 2, 109 (1970). Citing Literature Volume37, Issue216 October 1976Pages K187-K191 ReferencesRelatedInformation

Ferroelasticity has been established in the room temperature phase of Pb3(PxV1-xO4)2, (x ≥ 0.8). The coercitive stress and the spontaneous strain have been determined and found to be 1.6 bars and ca. 3.5 · 10−4 respectively. The effect of domain switching on double refraction and Raman spectra is clearly brought out.

physica status solidi (a)Volume 17, Issue 1 p. K57-K60 Short Note The dependence of raman scattering cross section on laser intensity for semiconducting NaX WO3 crystals E. Salje, E. Salje Mineralogisches Institut der Technischen Universität HannoverSearch for more papers by this authorG. Hoppmann, G. Hoppmann Mineralogisches Institut der Technischen Universität HannoverSearch for more papers by this author E. Salje, E. Salje Mineralogisches Institut der Technischen Universität HannoverSearch for more papers by this authorG. Hoppmann, G. Hoppmann Mineralogisches Institut der Technischen Universität HannoverSearch for more papers by this author First published: 16 May 1973 https://doi.org/10.1002/pssa.2210170154Citations: 2AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Citing Literature Volume17, Issue116 May 1973Pages K57-K60 RelatedInformation