scholarly journals Magnetic transitions with magnetocaloric effects near room temperature related to structural transitions in Y0.9Pr0.1Fe2D3.5 deuteride

2021 ◽  
Vol 130 (11) ◽  
pp. 113904
Author(s):  
V. Paul-Boncour ◽  
A. Herrero ◽  
V. Shtender ◽  
K. Provost ◽  
E. Elkaim
Keyword(s):  
Room Temperature ◽  
Structural Transitions ◽  
Magnetic Transitions

scholarly journals Temperature and Pressure Variation of the Cl-NQR in A2PbCl6-Crystals

1986 ◽  
Vol 41 (1-2) ◽  
pp. 311-314 ◽  
Author(s):  
Y. M. Seo ◽  
J. Pelzl ◽  
C. Dimitropoulos
Keyword(s):  
Relaxation Rate ◽  
Room Temperature ◽  
Lattice Relaxation ◽  
Pressure Variation ◽  
Mixed Crystals ◽  
Spin Lattice Relaxation ◽  
Structural Transitions ◽  
Spin Lattice Relaxation Rate ◽  
Spin Lattice ◽  
Temperature And Pressure

The 35Cl NQR frequency and spin-lattice relaxation rate in the compounds A2PbCl6 (A = Cs, Rb, NH4, K) have been investigated in the range 4.2 K to 500 K, and as a function of pressure at room temperature. NQR experiments conducted on (K: NH4)2PbCl6 mixed crystals have been used to complete the NQR-frequency versus temperature diagram of K2PbCl6, revealing two structural transitions at Tc1 ≅ 358 K and at TC2 ≅ 333 K.

Multiple magnetic transitions and magnetocaloric effect in hydrothermally synthesized single crystalline La0.5Sr0.5MnO3nanowires

2012 ◽  
Vol 1454 ◽  
pp. 63-68 ◽  
Author(s):  
Sayan Chandra ◽  
Anis Biswas ◽  
Subarna Datta ◽  
Barnali Ghosh ◽  
A.K. Raychaudhuri ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Low Temperature ◽  
Magnetocaloric Effect ◽  
Room Temperature ◽  
Magnetic State ◽  
Double Exchange ◽  
Synthesis Process ◽  
Theoretical Studies ◽  
Magnetic Transitions ◽  
Magnetocaloric Properties

ABSTRACTWe have successfully prepared La0.5Sr0.5MnO3nanowires using a novel hydrothermal synthesis process and studied their magnetic and magnetocaloric properties. The system exhibits an inverse magnetocaloric effect (IMCE) around 175 K indicating presence of significant AFM correlation. The MCE study reveals a clear paramagnetic (PM) to ferromagnetic (FM) transition near room temperature (T ~ 325K) which is followed by onset of AFM at lower temperatures. The development of the FM-like magnetic state at low temperature is attributed to the enhanced double exchange (DE) driven ferromagnetism in AFM state as predicted by recent theoretical studies.

Pressure-induced structural transitions of a room temperature ionic liquid—1-ethyl-3-methylimidazolium chloride

2017 ◽  
Vol 146 (9) ◽  
pp. 094502 ◽  
Author(s):  
Fengjiao Chen ◽  
Tingting You ◽  
Ye Yuan ◽  
Cuiying Pei ◽  
Xiangting Ren ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Room Temperature ◽  
Room Temperature Ionic Liquid ◽  
Structural Transitions

Trigonal Prismatic or Octahedral Surrounding in Sheet Oxides ?

1981 ◽  
Vol 36 (11) ◽  
pp. 1368-1374 ◽  
Author(s):  
Claude Delmas ◽  
Jean-Jacques Braconnier ◽  
Claude Fouassier ◽  
Paul Hagenmuller
Keyword(s):  
High Pressure ◽  
Room Temperature ◽  
Structural Transitions ◽  
Exchange Reactions ◽  
The Stability ◽  
Metastable Forms ◽  
Trigonal Prismatic ◽  
Alkali Ion

Abstract Layer Oxides, Intercalate, Trigonal Prismatic of Octahedral Surrounding According to the oxygen packing two types of alkali ion surroundings (octahedral or trigonal prismatic) are possible in the AxMO2 sheet oxides or the related A2MO3 compounds. The stability of both environments is discussed from the geometrical and electrostatic view points. Structural transitions to metastable forms can be induced by high pressure, intercalation, desintercalation or exchange reactions. The possibility of room temperature transformations can be anticipated from the relationships between the various oxygen packings.

scholarly journals Antisites driven magnetic transition study in La2NiMnO6

2021 ◽  
Vol 2070 (1) ◽  
pp. 012060
Author(s):  
R. Hissariya ◽  
S. K. Mishra
Keyword(s):  
Spin Glass ◽  
Room Temperature ◽  
Magnetic Transition ◽  
Double Perovskite ◽  
Charge Carriers ◽  
Magnetic Transitions ◽  
Spin Cluster ◽  
Transition Study ◽  
Lower Temperature ◽  
Unique Compound

Abstract La2NiMnO6 is a unique compound of multiferroics that exhibits two magnetic transitions of Curie points TC1 and TC2 below room temperature on a partial conversion of charge carriers, Ni2+ → Ni3+ and Mn4+→ Mn3+, stabilized with O2- vacancies in distorted octagons in a double perovskite of a spin cluster (glass), wherein the spins freezing at a critical Tg point at lower temperatures. The peak temperature and irreversibility temperature shifted to the lower temperature. The dc magnetization M (T) measurements indicate random ferromagnetic and antiferromagnetic interactions and multiple magnetic transitions. The critical slowing properties signify the spin-glass nature proved by the thermomagnetic relaxation measure.

Magnetic transitions in Cu2−xSe below room temperature

2001 ◽  
Vol 233 (3) ◽  
pp. 181-186
Author(s):  
A. Hamzić ◽  
Z. Ogorelec ◽  
K. Zadro ◽  
M. Basletić
Keyword(s):  
Room Temperature ◽  
Magnetic Transitions

scholarly journals Multiple magnetic transitions and associated room temperature magneto-functionality in Ni2.048Mn1.312In0.64

2016 ◽  
Vol 405 ◽  
pp. 270-273 ◽  
Author(s):  
S. Pramanick ◽  
P. Dutta ◽  
S. Chatterjee ◽  
S. Giri ◽  
S. Majumdar
Keyword(s):  
Room Temperature ◽  
Magnetic Transitions

Dependence of Intergranular Fracture on Boundary Topography and Cohesion

1973 ◽  
Vol 31 ◽  
pp. 150-151
Author(s):  
J. E. Doherty ◽  
A. F. Giamei ◽  
B. H. Kear ◽  
C. W. Steinke
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Nickel Base Superalloy ◽  
Boundary Shear ◽  
Room Temperature Ductility ◽  
Solid Solution Matrix ◽  
Nickel Base ◽  
Solution Matrix ◽  
Different Levels ◽  
Base Superalloy

Recently we have been investigating a class of nickel-base superalloys which possess substantial room temperature ductility. This improvement in ductility is directly related to improvements in grain boundary strength due to increased boundary cohesion through control of detrimental impurities and improved boundary shear strength by controlled grain boundary micros true tures.For these investigations an experimental nickel-base superalloy was doped with different levels of sulphur impurity. The micros tructure after a heat treatment of 1360°C for 2 hr, 1200°C for 16 hr consists of coherent precipitates of γ’ Ni3(Al,X) in a nickel solid solution matrix.

Hepatocyte Alterations in Guinea Pigs FED Polychlorinated Biphenyls (PCBs), Dibenzodioxins (PCDD), AND DIBENZOFURANS (PCDF)

1982 ◽  
Vol 40 ◽  
pp. 56-57
Author(s):  
J. N. Turner ◽  
D. N. Collins
Keyword(s):  
Guinea Pigs ◽  
Room Temperature ◽  
Dose Group ◽  
Methyl Cellulose ◽  
Uranyl Acetate ◽  
Target Organ ◽  
Office Building ◽  
Lead Citrate ◽  
Control Groups ◽  
Cooling Fluid

A fire involving an electric service transformer and its cooling fluid, a mixture of PCBs and chlorinated benzenes, contaminated an office building with a fine soot. Chemical analysis showed PCDDs and PCDFs including the highly toxic tetra isomers. Guinea pigs were chosen as an experimental animal to test the soot's toxicity because of their sensitivity to these compounds, and the liver was examined because it is a target organ. The soot was suspended in 0.75% methyl cellulose and administered in a single dose by gavage at levels of 1,10,100, and 500mgm soot/kgm body weight. Each dose group was composed of 6 males and 6 females. Control groups included 12 (6 male, 6 female) animals fed activated carbon in methyl cellulose, 6 males fed methyl cellulose, and 16 males and 10 females untreated. The guinea pigs were sacrificed at 42 days by suffocation in CO2. Liver samples were immediately immersed and minced in 2% gluteraldehyde in cacadylate buffer at pH 7.4 and 4°C. After overnight fixation, samples were postfixed in 1% OsO4 in cacodylate for 1 hr at room temperature, embedded in epon, sectioned and stained with uranyl acetate and lead citrate.

Domain Formation in Synthetic Quartz

1971 ◽  
Vol 29 ◽  
pp. 156-157
Author(s):  
Joseph J. Comer
Keyword(s):  
Electron Beam ◽  
Room Temperature ◽  
Domain Formation ◽  
Synthetic Quartz ◽  
Transmission Electron ◽  
Black Spots ◽  
Diffraction Mode ◽  
Domain Boundaries ◽  
Kikuchi Lines ◽  
Straight Lines

Domains visible by transmission electron microscopy, believed to be Dauphiné inversion twins, were found in some specimens of synthetic quartz heated to 680°C and cooled to room temperature. With the electron beam close to parallel to the [0001] direction the domain boundaries appeared as straight lines normal to <100> and <410> or <510> directions. In the selected area diffraction mode, a shift of the Kikuchi lines was observed when the electron beam was made to traverse the specimen across a boundary. This shift indicates a change in orientation which accounts for the visibility of the domain by diffraction contrast when the specimen is tilted. Upon exposure to a 100 KV electron beam with a flux of 5x 1018 electrons/cm2sec the boundaries are rapidly decorated by radiation damage centers appearing as black spots. Similar crystallographio boundaries were sometimes found in unannealed (0001) quartz damaged by electrons.

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