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Ti3O5 shows a first-order phase transition from the monoclinic structure to the pseudobrookite structure at 448°K, at which temperature a magnetic susceptibility anomaly has been reported earlier in the literature. There is an electrical conductivity discontinuity accompanying the phase transition. Incorporation of Fe stabilizes the high-temperature phase of Ti3O5; while with 2% Fe the transition temperature and enthalpy change are lowered, with 5% Fe there is no transition. Mössbauer spectra of 2% Fe-doped Ti3O5 are similar below and above the transition temperature and show no evidence for magnetic ordering in the low-temperature phase. These results are compared to the VO2 transition.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHoles in the oxygen (2p) valence bands and the concomitant formation of peroxide-like species in metal oxides: their role in metallicity and superconductivityC. N. R. Rao, P. Ganguly, M. S. Hegde, and D. D. SarmaCite this: J. Am. Chem. Soc. 1987, 109, 22, 6893–6895Publication Date (Print):October 1, 1987Publication History Published online1 May 2002Published inissue 1 October 1987https://pubs.acs.org/doi/10.1021/ja00256a076https://doi.org/10.1021/ja00256a076research-articleACS PublicationsRequest reuse permissionsArticle Views246Altmetric-Citations46LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
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The energies of ion migration in KCl through isolated vacancies, vacancy pairs, trivacancies, and interstitials have been investigated. A path-variation study in the case of vacancy and vacancy-pair mechanisms show that the usually assumed path in the (100) plane is the most probable one. Trivacancies do not seem to contribute to high-temperature conduction. On the other hand, the formation of a Frenkel defect pair and interstitialcy migration through a collinear path may be responsible for the nonrandom deviations in ionic conductivity data at high temperatures.
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The vapour phase absorption spectrum of nitrosobenzene has been studied in the 750 nm region. Prominent features of the vibrational structure are sets of four bands separated by approximately 40 cm–1 which can be assigned to the torsional transitions (0′â†� 1″), (0′â†� 0″), (1′â†� 0″), and (2′â†� 0″) around the C—N bond. The spacing of the torsional levels in the first excited singlet state is consistent with a V2 barrier of about 350 cm–1. This represents a sharp reduction from the estimated ground state values of 1300 cm–1. The complete vibrational analysis showed that there is only one electronic absorption system in the 750 nm region and that the complexity of the spectrum is essentially due to the low lying torsional modes.
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C. N. R. Rao, S. R. Yoganarasimhan and P. A. Faeth, Trans. Faraday Soc., 1961, 57, 504 DOI: 10.1039/TF9615700504
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Electron transport and magnetic properties of a number of rare-earth ortho-titanites, LnTiO3 (Ln rare-earth or Y), and ortho-vanadites, LnVO3, are studied in detail. The results are discussed in terms of Goodenough's phenomenological phase diagram. Properties of various transition metal oxide perovskites, LnBO3 (B transition metal), are compared. In einer Reihe von Seltenen-Erd-Ortho-Titaniten, LnTiO3 (Ln Seltene Erde oder Y), und -Ortho-Vanaditen, LnVO3, werden Elektronentransport und magnetische Eigenschaften ausführlich untersucht. Die Ergebnisse werden mit dem phänomenologischen Phasendiagramm von Goodenough diskutiert. Die Eigenschaften der verschiedenen Übergangsmetalloxid-Perovskite, LnBO3 (B Übergangsmetall) werden verglichen.
