scholarly journals Structure and luminescence properties of multicolor phosphor Ba2La3(GeO4)3F:Tb3+,Eu3+

RSC Advances ◽  
2019 ◽  
Vol 9 (61) ◽  
pp. 35717-35726 ◽  
Author(s):  
Xiaoxue Ma ◽  
Libing Liao ◽  
Qingfeng Guo ◽  
Haikun Liu ◽  
Dan Yang ◽  
...  
Keyword(s):  
Single Phase ◽  
Luminescence Properties ◽  
First Time

Single-phase Ba2La3(GeO4)3F:Tb3+,Eu3+ phosphors were obtained for the first time.

scholarly journals Preparation, structure and up-conversion luminescence properties of novel cryolite K3YF6:Er3+, Yb3+

RSC Advances ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 1658-1665
Author(s):  
Pengfei Shuai ◽  
Dan Yang ◽  
Libing Liao ◽  
Qingfeng Guo ◽  
Lefu Mei ◽  
...  
Keyword(s):  
Single Phase ◽  
Luminescence Properties ◽  
Luminescent Materials ◽  
First Time

Single-phase up-conversion luminescent materials K3YF6:Er3+, Yb3+ with cryolite structure were obtained for the first time.

scholarly journals Structure and luminescence properties of a novel broadband green-emitting oxyapatite-type phosphor

RSC Advances ◽  
2020 ◽  
Vol 10 (20) ◽  
pp. 11608-11614
Author(s):  
Na An ◽  
Fei Xu ◽  
Qingfeng Guo ◽  
Libing Liao ◽  
Lefu Mei ◽  
...  
Keyword(s):  
Single Phase ◽  
Luminescence Properties ◽  
Apatite Structure ◽  
Green Phosphor ◽  
First Time

A single-phase novel green phosphor Sr2Y3(SiO4)2(PO4)O2:Eu2+ with apatite structure was obtained for the first time.

scholarly journals Mechanical and Thermoelectric Properties of Bulk AlSb Synthesized by Controlled Melting, Pulverizing and Subsequent Vacuum Hot Pressing

2019 ◽  
Vol 9 (8) ◽  
pp. 1609 ◽  
Author(s):  
A. K. M. Ashiquzzaman Shawon ◽  
Soon-Chul Ur
Keyword(s):  
Mechanical Properties ◽  
Intermetallic Compound ◽  
Thermoelectric Properties ◽  
Hot Pressing ◽  
Single Phase ◽  
Aluminum Antimonide ◽  
Simple Method ◽  
Group Iii ◽  
Indirect Band Gap ◽  
First Time

Aluminum antimonide is a semiconductor of the Group III-V order. With a wide indirect band gap, AlSb is one of the least discovered of this family of semiconductors. Bulk synthesis of AlSb has been reported on numerous occasions, but obtaining a single phase has always proven to be extremely difficult. This work reports a simple method for the synthesis of single-phase AlSb. Subsequently, consolidation was done into a near single-phase highly dense semiconductor in a form usable for thermoelectric applications. Further, the thermoelectric properties of this system are accounted for the first time. In addition, the mechanical properties of the intermetallic compound are briefly discussed for a possibility of further use.

Ion size effect on chemical bonds of the RBa2Cu2.9Zn0.1Oy system

2018 ◽  
Vol 33 (3) ◽  
pp. 209-215
Author(s):  
R. Benredouane ◽  
C. Boudaren
Keyword(s):  
Single Phase ◽  
Rietveld Method ◽  
Solid State Reaction Method ◽  
X Ray ◽  
Bond Angles ◽  
Bond Valence Sum ◽  
Ion Size ◽  
First Time ◽  
Unique Variation ◽  
Strong Curvature

Single-phase polycrystalline samples of RBa2Cu2.9Zn0.1Oy (R = Y, Nd, Gd, Er, and Tm) (ZnR123) were synthesized using the standard solid-state reaction method. They were characterized by X-ray powder diffraction (XRD) and scanning electron microscope. XRD shows that all samples consist essentially of a single phase and retain the orthorhombic structure. The structure of the samples was refined by the Rietveld method with the help of the bond valence sum method. The variation of the lattice parameters and some meaningful bond angles and lengths with the ionic radius are discussed. In these compounds, the variations of the buckling angles Cu2–O(2,3)–Cu2 and Cu2–Cu2–O(2,3) are unique: the bond angles Cu2–O3–Cu2 and Cu2–Cu2–O2 increase, whereas the bond angles Cu2–O2–Cu2 and Cu2–Cu2–O3 decrease. The variation of these bond angles brings about a strong curvature of the Cu2O plane. Furthermore, we have found tree fixed triangles formed by the Cu2, O2, and O3 atoms in addition to another fixed triangle O1–Ba–O1 observed for the first time. BVS of Cu2 atom shows a specific and unique variation compared with other compounds.

scholarly journals A preliminary investigation of the molten salt mediated synthesis of Gd2TiO5 ‘stuffed’ pyrochlore

MRS Advances ◽  
2021 ◽  
Author(s):  
D. A. Austin ◽  
M. Cole ◽  
M. C. Stennett ◽  
C. L. Corkhill ◽  
N. C. Hyatt
Keyword(s):  
Molten Salt ◽  
Single Phase ◽  
Preliminary Investigation ◽  
Pyrochlore Phase ◽  
Comparative Investigation ◽  
Molten Salt Synthesis ◽  
Control Rods ◽  
First Time ◽  
Conventional Solid State Synthesis ◽  
Nuclear Applications

Abstract Refractory ‘stuffed’ pyrochlores such as Gd2TiO5 are of interest for nuclear applications, including as matrices for actinide disposition and as neutron absorbers in control rods. Here, we report the results of a preliminary comparative investigation of the synthesis of Gd2TiO5 by molten salt and conventional solid-state synthesis. We show that synthesis of Gd2TiO5 proceeds from the pyrochlore phase Gd2Ti2O7 which is first formed as a kinetic product. Molten salt synthesis afforded single phase Gd2TiO5 at 1300 °C in 2 h, via a template growth mechanism, and is effective for the synthesis of these refractory materials. This work demonstrates molten salt mediated synthesis of ‘stuffed’ pyrochlore for the first time. Graphic abstract

scholarly journals New metal-oxide composite materials as efficient catalysts of the partial oxidation of methane

2019 ◽  
Vol 484 (3) ◽  
pp. 299-302
Author(s):  
A. G. Dedov ◽  
O. A. Slyakhtin ◽  
A. S. Loktev ◽  
G. N. Mazo ◽  
S. A. Malyshev ◽  
...  
Keyword(s):  
Partial Oxidation ◽  
Single Phase ◽  
Complex Oxides ◽  
Partial Oxidation Of Methane ◽  
Metallic Nickel ◽  
Oxidation Of Methane ◽  
Nickel Cobalt ◽  
Phase Complex ◽  
First Time ◽  
Properties Of Composites

Single-phase complex oxides Nd2-yCayCoxNi1-xO4 have been synthesized for the first time. Composites prepared by the reduction of these compounds with hydrogen and containing Nd2O3, CaO, and cobalt and nickels metals have been used for the first time as catalysts of the partial oxidation of methane. The maximal methane conversions (97%) and syngas yields (96%) at 900 °С have been detected in the presence of the composite obtained from Nd1,5Ca0,5NiO4. At T < 850 °C, the nickel–cobalt composite synthesized from Nd1,3Ca0,7Co0,4Ni0,6O4 turned out to be more selective in the formation of syngas. Decreasing the partial oxidation temperature from 900 °С to 750 °С leads to the oxidation of metallic nickel and cobalt to oxides and to partial resynthesis of complex oxides with perovskite and K2NiF4 structures. The observed differences in temperature dependence of the catalytic properties of composites with various Ni/Co ratios can be associated with the participation of complex oxides in catalysis of the partial oxidation of methane at low temperatures.

scholarly journals A novel single-phase white light emitting phosphor Ca9La(PO4)5(SiO4)F2:Dy3+: synthesis, crystal structure and luminescence properties

RSC Advances ◽  
2016 ◽  
Vol 6 (29) ◽  
pp. 24577-24583 ◽  
Author(s):  
Haikun Liu ◽  
Libing Liao ◽  
Maxim S. Molokeev ◽  
Qingfeng Guo ◽  
Yuanyuan Zhang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Temperature ◽  
Solid State ◽  
White Light ◽  
Single Phase ◽  
Luminescence Properties ◽  
Light Emitting ◽  
State Technology

A novel single-phase white light emitting phosphor Ca9La(PO4)5(SiO4)F2:Dy3+ was prepared through traditional high-temperature solid state technology.

scholarly journals Structure and luminescence properties of La6Ba4(SiO4)6F2:Dy3+ phosphor with apatite structure

RSC Advances ◽  
2018 ◽  
Vol 8 (68) ◽  
pp. 38883-38890 ◽  
Author(s):  
Jialei Zhang ◽  
Qingfeng Guo ◽  
Libing Liao ◽  
Yongjie Wang ◽  
Mingyue He ◽  
...  
Keyword(s):  
Thermal Stability ◽  
White Light ◽  
Single Phase ◽  
Luminescence Properties ◽  
Apatite Structure ◽  
Light Emitting ◽  
Good Thermal Stability

Single-phase white light emitting La6Ba4(SiO4)6F2:Dy3+ phosphors with good thermal stability were obtained.

scholarly journals One-step ultra-rapid fabrication and thermoelectric properties of Cu2Se bulk thermoelectric material

RSC Advances ◽  
2019 ◽  
Vol 9 (19) ◽  
pp. 10508-10519 ◽  
Author(s):  
Tiezheng Hu ◽  
Yonggao Yan ◽  
Si Wang ◽  
Xianli Su ◽  
Wei Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermoelectric Properties ◽  
Single Phase ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Thermoelectric Energy ◽  
Rapid Fabrication ◽  
One Step ◽  
First Time

Cu2Se is a promising material for thermoelectric energy conversion. Fully dense single-phase bulk Cu2Se was prepared by the combination of self-propagating high-temperature synthesis with in situ quick pressing for the first time.

scholarly journals Selective Synthesis and Luminescence Properties of Nanocrystalline GdF3:Eu3+with Hexagonal and Orthorhombic Structures

2010 ◽  
Vol 2010 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaoting Zhang ◽  
Tomokatsu Hayakawa ◽  
Masayuki Nogami ◽  
Yukari Ishikawa
Keyword(s):  
Formation Mechanism ◽  
Room Temperature ◽  
Luminescence Properties ◽  
Selective Synthesis ◽  
Orthorhombic Structure ◽  
Chemical Route ◽  
Structure And Morphology ◽  
First Time ◽  
Soft Chemical Route

GdF3:Eu3+nanophosphors with hexagonal or orthorhombic structure have been succeeded to be selectively synthesized at room temperature for the first time via a simple soft chemical route. The structure and morphology of GdF3:Eu3+nanophosphors were controlled by using different fluoride precursors. Hexagonal GdF3:Eu3+nanocrystals were formed when NaBF4was used as a fluoride precursor, while orthorhombic GdF3:Eu3+nanocrystals were obtained with NaF or NH4F fluoride precursor. It was also experimentally revealed that hexagonal GdF3:Eu3+nanophosphors emitted essentially stronger Eu3+luminescence than orthorhombic ones did. The formation mechanism of GdF3nanocrystals and the possible reasons of the strong PL in hexagonal were discussed.

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