𝔖 Bobbio Scriptorium
✦   LIBER   ✦

A Structural Study of the Perovskite Series CaTi1−2xFexNbxO3

✍ Scribed by Anton R. Chakhmouradian; Roger H. Mitchell

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
383 KB
Volume
138
Category
Article
ISSN
0022-4596

No coin nor oath required. For personal study only.

✦ Synopsis

An X-ray powder diffraction study of the series CaTi 1؊2x Fe x Nb x O 3 is presented. The series comprises orthorhombic perovskites (Pbnm, a+b+'2a p , c+2a p , Z ‫؍‬ 4) in the range 04x40.3, and monoclinic perovskites (P2 1 /n, a+b+'2a p , c+2a p , O90°, Z ‫؍‬ 4) in the range 0.44x40.5. The structure of the orthorhombic members is derived from the cubic aristotype by octahedral rotation a ؊ a ؊ c ؉ . The structural distortion in the monoclinic members involves octahedral rotation and short-range cation ordering at the B-site (4c and 4d). In the series CaTi 1؊2x Fe x Nb x O 3 , the unit-cell parameters and degree of octahedral rotation increase with x. The [111] p tilt angle increases from 16.1°in CaTiO 3 to 17.6-18.9°in CaFe 1/2 Nb 1/2 O 3 (for the NbO 6 and FeO 6 octahedra, respectively). In contrast to previous studies, here the diffraction pattern of the end-member CaFe 1/2 Nb 1/2 O 3 is interpreted to exhibit splitting of the hkl and h0l lines indicative of a monoclinic derivative of the CaTiO 3 -type structure.

📜 SIMILAR VOLUMES

A Structural Study of the Perovskite Ser
A Structural Study of the Perovskite Series Na1/2+xLa1/2−3xTh2xTiO3
✍ Roger H. Mitchell; Anton R. Chakhmouradian 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 294 KB

An X-ray powder diffraction study of the series Na 1/ 2؉x La 1/ 2؊3x Th 2x TiO 3 is presented. The series comprises orthorhombic CaTiO 3 -type perovskites (Pnma, a+c+(2 a p , b+2 a p ) in the range 04x40.083 and tetragonal La 1/2 Li 1/2 TiO 3 -type perovskites (P4/mmm, a ‫؍‬ a p , c+2a p ) in the ra

Structural Characterization of the Perov
Structural Characterization of the Perovskite Series La1−xSrxCr1−xTixO3
✍ B.J. Kennedy; C.J. Howard; G.J. Thorogood; M.A.T. Mestre; J.R. Hester 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 98 KB

The perovskite-type compounds La 1؊x Sr x Cr 1؊x Ti x O 3 , x ‫؍‬ 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, have been synthesized by alkoxide methods, and the room temperature structures characterized using X-ray synchrotron powder di4raction. The x ‫؍‬ 0 endmember, LaCrO 3 , and the x ‫؍‬ 0.1 co

A New Series of Complex Perovskites La1−
A New Series of Complex Perovskites La1−xSrxCr1−xTixO3: Structural Characterization
✍ Roger H Mitchell; Anton R Chakhmouradian 📂 Article 📅 1999 🏛 Elsevier Science 🌐 English ⚖ 148 KB

A new series of complex perovskite-type compounds La 1؊x Sr x Cr 1؊x Ti x O 3 involving substitutions at both A and B sites was prepared by the ceramic technique (final heating at 1350°C). X-ray powder diffraction and profile-refinement study of this series show it to comprise orthorhombic perovskit

Study of Structural, Magnetic, and Elect
Study of Structural, Magnetic, and Electrical Properties of La2/3Ca1/3Mn1−xInxO3Perovskites
✍ M.C. Sánchez; J. Blasco; J. Garcı́a; J. Stankiewicz; J.M. De Teresa; 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 271 KB

The effect of the substitution of Mn with In in the magnetoresistive La 2/3 Ca 1/3 MnO 3 compound has been studied by means of X-ray diffraction, a.c. magnetic susceptibility, d.c. magnetization, and d.c. resistance techniques. This substitution is possible for x4 40.07 under normal synthetic proced