scholarly journals Ferromagnetic Insulators: Room-Temperature Ferromagnetic Insulating State in Cation-Ordered Double-Perovskite Sr2 Fe1+ x Re1− x O6 Films (Adv. Mater. 4/2019)

2019 ◽  
Vol 31 (4) ◽  
pp. 1970021
Author(s):  
Changhee Sohn ◽  
Elizabeth Skoropata ◽  
Yongseong Choi ◽  
Xiang Gao ◽  
Ankur Rastogi ◽  
...  
Keyword(s):  
Room Temperature ◽  
Double Perovskite

scholarly journals Room-Temperature Low-Field Colossal Magnetoresistance in Double-Perovskite Manganite

2019 ◽  
Vol 123 (12) ◽  
Author(s):  
S. Yamada ◽  
N. Abe ◽  
H. Sagayama ◽  
K. Ogawa ◽  
T. Yamagami ◽  
...  
Keyword(s):  
Colossal Magnetoresistance ◽  
Room Temperature ◽  
Double Perovskite ◽  
Perovskite Manganite ◽  
Low Field

scholarly journals Structural and optical properties of a revived Pb0.5Ba1.5BiVO6 perovskite oxide

2019 ◽  
Vol 09 (01) ◽  
pp. 1950004 ◽  
Author(s):  
R. K. Parida ◽  
D. K. Pattanayak ◽  
Bhagyashree Mohanty ◽  
Nimai C. Nayak ◽  
B. N. Parida
Keyword(s):  
Perovskite Structure ◽  
Room Temperature ◽  
Microstructural Analysis ◽  
Compositional Analysis ◽  
Rhombohedral Phase ◽  
Double Perovskite ◽  
Xrd Analysis ◽  
Perovskite Oxide ◽  
Dielectric Study ◽  
Wide Range

The polycrystalline ceramic Pb[Formula: see text]Ba[Formula: see text]BiVO6 manifesting the complex double perovskite structure was tailored by the conventional solid state route at a moderate temperature. Qualitative phase analysis and formation of the ceramic were affirmed by XRD analysis. The X-ray powder diffraction pattern of the compound explored at room temperature affirms the single phase formation with double perovskite structure exhibiting rhombohedral phase. Microstructural analysis of the studied compound procured from the Scanning Electron Microscope (SEM) validates the formation of dense microstructures and nonuniformly distributed grains with minimal voids. Compositional analysis was shaped through the Electron Diffraction Spectroscopy (EDS) confirming the absence of contamination of any other metals apart from the mentioned ones. Dielectric (Cr and [Formula: see text]) parameters of the compound were studied using the LCR analyzer at different temperatures and wide range of frequencies. The polarization and dielectric study affirms the presence of ferroelectricity in the material with transition temperature much above the room temperature. The tangent dielectric loss of this sample being almost minimal at room temperature attributes it to find applications in different grounds of electronics. Optical equities of the ceramic were further analyzed by the RAMAN, FTIR, UV–Vis and Photoluminescence spectroscopy.

Large room-temperature intergrain magnetoresistance in double perovskite SrFe1−x(Mo or Re)xO3

1999 ◽  
Vol 74 (12) ◽  
pp. 1737-1739 ◽  
Author(s):  
T. H. Kim ◽  
M. Uehara ◽  
S-W. Cheong ◽  
S. Lee
Keyword(s):  
Room Temperature ◽  
Double Perovskite

Room temperature relaxor ferroelectricity and spin glass behavior in Sr2FeTiO6 double perovskite

2012 ◽  
Vol 522 ◽  
pp. 90-95 ◽  
Author(s):  
P. Neenu Lekshmi ◽  
S. Savitha Pillai ◽  
K.G. Suresh ◽  
P.N. Santhosh ◽  
Manoj Raama Varma
Keyword(s):  
Spin Glass ◽  
Room Temperature ◽  
Double Perovskite ◽  
Spin Glass Behavior ◽  
Glass Behavior

ChemInform Abstract: Emergence of Room-Temperature Magnetic Ordering in Artificially Fabricated Ordered-Double-Perovskite Sr2FeRuO6.

ChemInform ◽  
2011 ◽  
Vol 42 (35) ◽  
pp. no-no
Author(s):  
Jaewan Chang ◽  
Kyujoon Lee ◽  
Myung Hwa Jung ◽  
Ji-Hwan Kwon ◽  
Miyoung Kim ◽  
...  
Keyword(s):  
Room Temperature ◽  
Magnetic Ordering ◽  
Double Perovskite

scholarly journals Structural, magnetic and electrical properties of a new double-perovskite LaNaMnMoO 6 material

2017 ◽  
Vol 4 (11) ◽  
pp. 170920 ◽  
Author(s):  
Sameh Megdiche Borchani ◽  
Wissem Cheikh-Rouhou Koubaa ◽  
Makrem Megdiche
Keyword(s):  
Applied Field ◽  
Room Temperature ◽  
Double Perovskite ◽  
Entropy Change ◽  
Cooling Power ◽  
Room Temperature Resistivity ◽  
Ferromagnetic Transition ◽  
X Ray Diffraction ◽  
Electrical Measurements ◽  
Xrd Patterns

Structural, magnetic, magnetocaloric, electrical and magnetoresistance properties of an LaNaMnMoO 6 powder sample have been investigated by X-ray diffraction (XRD), magnetic and electrical measurements. Our sample has been synthesized using the ceramic method. Rietveld refinements of the XRD patterns show that our sample is single phase and it crystallizes in the orthorhombic structure with Pnma space group. Magnetization versus temperature in a magnetic applied field of 0.05 T shows that our sample exhibits a paramagnetic–ferromagnetic transition with decreasing temperature. The Curie temperature T C is found to be 320 K. Arrott plots show that all our double-perovskite oxides exhibit a second-order magnetic phase transition. From the measured magnetization data of an LaNaMnMoO 6 sample as a function of the magnetic applied field, the associated magnetic entropy change |−ΔSM| and the relative cooling power (RCP) have been determined. In the vicinity of T C , |−ΔSM| reached, in a magnetic applied field of 8 T, a maximum value of ∼4 J kg −1  K −1 . Our sample undergoes a large magnetocaloric effect at near-room temperature. Resistivity measurements reveal the presence of an insulating-metal transition at Tρ = 180 K. A magnetoresistance of 30% has been observed at room temperature for 6 T, significantly larger than that reported for the A 2 FeMoO 6 (A = Sr, Ba) double-perovskite system.

scholarly journals RAMAN SPECTROSCOPY OF CaCu3Ti4O12 CERAMICS REVISITED

2018 ◽  
Vol 34 (3) ◽  
Author(s):  
Nhat Hoang Nam
Keyword(s):  
Raman Spectroscopy ◽  
Room Temperature ◽  
Structural Characteristics ◽  
Double Perovskite ◽  
Solid State Reaction Method ◽  
Excess Oxygen ◽  
Optical Phonons ◽  
Reaction Method ◽  
Colossal Dielectric Constant ◽  
Perovskite Type

The CaCu3Ti4O12 ceramic has been prepared by Solid State Reaction method in excess oxygen. It possesses a well-defined double-perovskite type crystalline structure and exhibits a colossal dielectric constant at around 50000 at room temperature. This paper revised the imprints of Raman spectroscopy of this compound to validate its structural characteristics and optical behaviors. A special attention is paid on the account of optical phonons which show a recognizable agreement with the other results recently reported

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