Evolution of ( La 1 - y Pr y ) 0.7 Ca 0.3 MnO 3 crystal structure with A-cation size, temperature, and oxygen isotope substitution

2001 ◽  
Vol 19 (2) ◽  
pp. 215-223 ◽  
Author(s):  
A.M. Balagurov ◽  
V.Yu. Pomjakushin ◽  
D.V. Sheptyakov ◽  
V.L. Aksenov ◽  
N.A. Babushkina ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Oxygen Isotope ◽  
Isotope Substitution ◽  
Cation Size

Effect of oxygen isotope substitution on charge ordering and magnetic and transport properties inPr0.5Ca0.5MnO3doped by chromium and ruthenium

2008 ◽  
Vol 78 (21) ◽  
Author(s):  
N. A. Babushkina ◽  
A. N. Taldenkov ◽  
A. V. Inyushkin ◽  
A. Maignan ◽  
D. I. Khomskii ◽  
...  
Keyword(s):  
Transport Properties ◽  
Oxygen Isotope ◽  
Charge Ordering ◽  
Isotope Substitution ◽  
Effect Of Oxygen

Site-selective oxygen-isotope substitution inYBa2Cu3O7−δ

1991 ◽  
Vol 44 (17) ◽  
pp. 9556-9561 ◽  
Author(s):  
Donald E. Morris ◽  
Andrea G. Markelz ◽  
John Y. T. Wei ◽  
Charles T. Hultgren ◽  
Janice H. Nickel ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
Isotope Substitution ◽  
Site Selective

scholarly journals Effect of oxygen isotope substitution and crystal microstructure on magnetic ordering and phase separation in(La1−yPry)0.7Ca0.3MnO3

2007 ◽  
Vol 75 (5) ◽  
Author(s):  
V. Yu. Pomjakushin ◽  
D. V. Sheptyakov ◽  
K. Conder ◽  
E. V. Pomjakushina ◽  
A. M. Balagurov
Keyword(s):  
Phase Separation ◽  
Oxygen Isotope ◽  
Magnetic Ordering ◽  
Isotope Substitution ◽  
Effect Of Oxygen

scholarly journals Structural and Electrical Properties of Ca2+ Doped LaFeO3: The Effect of A-site Cation Size Mismatch

2020 ◽  
Vol 10 (2) ◽  
pp. 5538-5546
Author(s):  
A. E. Irmak
Keyword(s):  
Crystal Structure ◽  
Sol Gel ◽  
Charge Ordering ◽  
Room Temperature Resistivity ◽  
Size Mismatch ◽  
Ca Doping ◽  
Average Size ◽  
A Site ◽  
Cation Size ◽  
Small Polarons

In this study, nanosized La1-xCaxFeO3 (0.00≤x≤0.40) compounds prepared via sol-gel method followed by heat treatment at 1100oC for 24 hours are studied. Crystal structure, microstructure, surface morphology and temperature-dependent resistivity of the samples are investigated. TEM investigation reveals nanoparticles with an average size of 35nm produced from the sol-gel process. The crystal structure of the compounds belongs to an orthorhombically distorted perovskite structure with Pbnm space group. Lattice distortion and cation size mismatch increase with an increase in Ca and particle and grain growth are suppressed by Ca doping. Electrical conduction is explained via thermally activated hopping of small polarons. Unit cell volume, charge ordering temperature, and activation energy for small polarons decrease linearly with an increase in cation size mismatch. Room temperature resistivity decreases with Ca doping and gets its minimum value for 30% Ca at which the orthorhombic distortion is maximum.

The versatility of lithium cation coordination modes in salts with [W(CN)6(bpy)]2− anions

CrystEngComm ◽  
2020 ◽  
Vol 22 (23) ◽  
pp. 3991-3998
Author(s):  
Maciej Hodorowicz ◽  
Janusz Szklarzewicz ◽  
Anna Jurowska
Keyword(s):  
Crystal Structure ◽  
Cell Volume ◽  
Lithium Cation ◽  
Coordination Modes ◽  
Cation Coordination ◽  
Cyanide Ligands ◽  
Cation Size

Effect of the cation size (compared to Cs+) in Li2[W(CN)6(bpy)] salts on the nature of the interaction with cyanide ligands and on the crystal structure is discussed, unusual decrease of the W–W distance and increase of cell volume are observed.

scholarly journals On the Color and Genesis of Prase (Green Quartz) and Amethyst from the Island of Serifos, Cyclades, Greece

Minerals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 487 ◽  
Author(s):  
Stephan Klemme ◽  
Jasper Berndt ◽  
Constantinos Mavrogonatos ◽  
Stamatis Flemetakis ◽  
Ioannis Baziotis ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Chemical Composition ◽  
Oxygen Isotope ◽  
Electron Microprobe ◽  
Crystallization Process ◽  
Mineral Chemistry ◽  
Quartz Crystals ◽  
Two Generations ◽  
Dispersed Inclusions ◽  
Isotope Measurements

The color of quartz and other minerals can be either caused by defects in the crystal structure or by finely dispersed inclusions of other minerals within the crystals. In order to investigate the mineral chemistry and genesis of the famous prase (green quartz) and amethyst association from Serifos Island, Greece, we used electron microprobe analyses and oxygen isotope measurements of quartz. We show that the color of these green quartz crystals is caused by small and acicular amphibole inclusions. Our data also shows that there are two generations of amphibole inclusions within the green quartz crystals, which indicate that the fluid, from which both amphiboles and quartz have crystallized, must have had a change in its chemical composition during the crystallization process. The electron microprobe data also suggests that traces of iron may be responsible for the amethyst coloration. Both quartz varieties are characterized by isotopic compositions that suggest mixing of magmatic and meteoric/marine fluids. The contribution of meteoric fluid is more significant in the final stages and reflects amethyst precipitation under more oxidizing conditions.

The effect of oxygen isotope substitution on magnetic properties of (La1-yPry)0.7Ca0.3MnO3manganites

1999 ◽  
Vol 11 (30) ◽  
pp. 5865-5873 ◽  
Author(s):  
N A Babushkina ◽  
L M Belova ◽  
A N Taldenkov ◽  
E A Chistotina ◽  
D I Khomskii ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Oxygen Isotope ◽  
Isotope Substitution ◽  
Effect Of Oxygen
Sign in / Sign up

Export Citation Format

Share Document