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• W1970192358 abstract "A number of compositions A 2 3+ Ti 2 4+ O 7 and of related mixed phases were prepared and investigated. For the trivalent lanthanons from Sm to Lu, and for Y, the homogeneous A 2 Ti 2 O 7 phases were of the cubic pyrochlore type. Their lattice parameters gave a very good linear relationship when plotted against the Templeton–Dauben radii of A 3+ . The room-temperature stability region of the pyrochlore titanates at ordinary pressures extends from an Ahrens radius ratio, r(A 3+ ):r(Ti 4+ ), of about 1.22 to about 1.50, taking into account homogeneous mixed phases. The compositions Bi 2 Ti 2 O 7 , In 2 Ti 2 O 7 , and Cr 2 Ti 2 O 7 were not cubic pyrochlores; the results of an X-ray and neutron examination of Sc 2 Ti 2 O 7 indicate that further work is needed to clarify its structural properties.The structures of Lu, Y, Gd, and Sm titanates were refined from X-ray powder data and that of Y 2 (Ti 0.64 Zr 0.36 ) 2 O 7 , from neutron powder data. The structure of Er 2 Ti 2 O 7 was re-refined from previously published data without significant improvement. The positional parameter of the majority oxygen atom, x(O 2 ), in A 2 B 2 O 7 pyrochlores has been found to increase, and the distortion of the BO 6 octahedra to decrease, with the increasing r(A 3+ ):r(B 4+ ) ratio. This is in agreement with a similar result obtained earlier from Mössbauer spectra for A 2 FeSbO 7 pyrochlores.The variation of the frequencies of the principal absorption bands in the infrared spectra of the titanates has been correlated with r(A 3+ ). No evidence of ferroelectricity was found in Sm and Er titanates between room temperature and 4.2 °K.The Templeton–Dauben set of empirical crystal radii for trivalent lanthanons has been supplemented by values for Sc, In, Tl, and Bi derived from the C-type sesquioxides and the pyrochlores. The self-consistency and applicability of the expanded set have been tested on several series of isostructural compounds." @default.
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• W1970192358 date "1969-03-15" @default.
• W1970192358 modified "2023-10-16" @default.
• W1970192358 title "Pyrochlores. V. Thermoanalytic, X-ray, neutron, infrared, and dielectric studies of A₂Ti₂O₇ titanates" @default.
• W1970192358 doi "https://doi.org/10.1139/v69-155" @default.
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