Perovskites I (Part a) by E. Burzo (auth.), H.P.J. Wijn (eds.)

By E. Burzo (auth.), H.P.J. Wijn (eds.)

Within the current and primary subvolume 27F1 the magnetic homes of AMO3 - kind and of (AR)MO3 - sort perovskite oxides (A = alkaline-earth steel, M = d transition aspect, R = infrequent earth aspect) were compiled. In a few features this quantity is a complement to the formerly released survey in Landolt-Börnstein of J.B. Goodenough and J.M. Longo Vol. III/4a (1970) and S. Nomura Vol. III/12a (1978). even if this quantity III/27F1 offers in itself a entire nation of the data of the magnetic and magnetism-related houses of the thought of compounds.

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In strongly correlated YTiOs it requires at least 35 at. % Ca to induce metallic conductivity, but the disappearanceof ferromagnetic ordering takes place at 10 at. % Ca. The transport properties of the A,Ndi-,TiOs orthorhombically distorted phases are influenced by both Ti-0-Ti angles and the Ti-0 distanceswhereasthe properties of the cubic phasesare affectedby Ti-0 distances[95El]. IO5 S2cm IO4 10-5 0 50 a 100 150 200 0 250 K 300 50 100 150 200 250 K 300 b Fig. 26. A,Nd,-,Ti03. Temperaturedependencesof the electrical resistivities for A = Ca (a) and Sr (b) [95El].

18). 1 (QcmI 1 10-l ~I 10-I lo! - b a Fig. 17. The conductivitiesas function of oxygen partial pressure at constant temperatures: , (a) from lo-** 10 10-l" lo-l6 to IO-* atm [81Bl]. PO,Slope of curves in (b) is given in parentheses. atm and (b) from Land1111 - Biirnstcin New Series 111127Fla Ref. p. 0 Fig. 18. 1 wt % Fe (a) were annealed 20 min in atmospheric Hz, at indicatedandrapidlyquenched[73Wl]. 4 wt % Fe (b). Resistivitiesvs. T’. The samples temperatures Studies of the defect chemistry of BaTiOs, polycrystalline and flux-grown single crystals, at temperaturesabove 500°C have been performed [65Vl, 67K1, 71L1, 71L2, 74S1, 76Cl].

Bhide, V. , Bhasin, H. Rev. 172 (1968) 290. : J. Inorg. Nucl. 30 (1968) 656. J. B18 (1968) 1038. Glass,J. , Kliwer, J. : Nucl. All5 (1968) 234. Muller, K. Rev. Lett. 21 (1968) 814. Matsonashvili, B. : Sov. Crystallogr. 12 (1968) 867. : J. Sot. Jpn. 24 (1968) 533. : Jpn. J. Appl. 7 (1968) 232. Walters, L. , Grace,R. : J. Solids 28 (1968) 239. : J. Sot. Jpn. 26 (1969) 1324. Levin, E. , Robbins, C. , McMurdie, H. : PhaseDiagrams for Ceramists, 1964, Resen, M. K. ), American Ceramic Society Columbus,Ohio.

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