The structural evolution and spectral blue shift of solid solution phosphors Sr3−mCamB2O6:Eu2+

CrystEngComm ◽  
2016 ◽  
Vol 18 (24) ◽  
pp. 4597-4603 ◽  
Author(s):  
Zhongxian Qiu ◽  
Hongzhou Lian ◽  
Mengmeng Shang ◽  
Shixun Lian ◽  
Jun Lin
Keyword(s):  
Solid Solution ◽  
Structural Evolution ◽  
Blue Shift

Dopant Site Environment and Spectrum Blue Shift of Yellow-Emitting Solid Solution Phosphor Ba2−x Sr x Mg(PO4 )2 :Eu2+

2015 ◽  
Vol 99 (2) ◽  
pp. 645-650 ◽  
Author(s):  
Qingsong Hu ◽  
Zaifa Pan ◽  
Yu Xu ◽  
Lili Wang ◽  
Lixin Ning
Keyword(s):  
Solid Solution ◽  
Blue Shift

Improving rate performance of high-voltage spinel cathode by changing structural evolution from two-phase to solid-solution reactions

2018 ◽  
Vol 281 ◽  
pp. 24-30 ◽  
Author(s):  
Yuan Xue ◽  
Yi Han ◽  
Hao-Xiang Yu ◽  
Jie Shu ◽  
Zhen-Bo Wang ◽  
...  
Keyword(s):  
Solid Solution ◽  
High Voltage ◽  
Structural Evolution ◽  
Rate Performance ◽  
Two Phase ◽  
Spinel Cathode

scholarly journals Tunable photoluminescence in Ba1-xSrxSi3O4N2: Eu2+/ Ce3+, Li+ solid solution phosphors induced by linear structural evolution

2019 ◽  
Vol 9 (4) ◽  
pp. 1922
Author(s):  
Zhijun Zhang ◽  
Woochul Yang
Keyword(s):  
Solid Solution ◽  
Structural Evolution

Structural Evolution in the Systems TAl3-xGex (T = Zr, Hf)

2019 ◽  
Vol 289 ◽  
pp. 71-76
Author(s):  
Danylo Maryskevych ◽  
Yaroslav O. Tokaychuk ◽  
Roman E. Gladyshevskii
Keyword(s):  
Solid Solution ◽  
High Temperature ◽  
Crystal Structures ◽  
Structural Evolution ◽  
Structure Type ◽  
Ternary Compounds ◽  
Pearson Symbol ◽  
The Family ◽  
Binary Compounds ◽  
High Temperature Modification

The crystal structures of the binary compounds ZrAl3 and HfAl3 at 600°C belong to the structure type ZrAl3 (Pearson symbol tI16, space group I4/mmm, a = 4.00930(11), c = 17.2718(7) Å for ZrAl3 and a = 3.9849(3), c = 17.1443(15) Å for HfAl3). Substitution of Ge atoms for Al atoms in ZrAl3 and HfAl3 led to the formation of the ternary compounds ZrAl2.52(1)Ge0.48(1) and HfAl2.40(1)Ge0.60(1), respectively, where the latter is probably part of a solid solution extending from the high-temperature modification of HfAl3. The crystal structures belong to the tetragonal structure type ht-TiAl3 (tI8, I4/mmm, a = 3.92395(11), c = 9.0476(4) Å for ZrAl2.52Ge0.48 and a = 3.9021(2), c = 8.9549(8) Å for HfAl2.40Ge0.60). The structure types ZrAl3 and ht-TiAl3 are both members of the family of close-packed structures.

scholarly journals Discovery of novel solid solution Ca3Si3−x O3+x N4−2x : Eu2+ phosphors: structural evolution and photoluminescence tuning

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Baochen Wang ◽  
Yan-gai Liu ◽  
Zhaohui Huang ◽  
Minghao Fang ◽  
Xiaowen Wu
Keyword(s):  
Solid Solution ◽  
Structural Evolution

Structural Evolution of AuPt and AuPd Nanoparticles Fabricated by Microwave Assisted Synthesis: A Comparative Study

2015 ◽  
Vol 1802 ◽  
pp. 13-18 ◽  
Author(s):  
Tirtha Som ◽  
Robert Wendt ◽  
Simone Raoux ◽  
Jean L. Jordan-Sweet ◽  
Markus Wollgarten ◽  
...  
Keyword(s):  
Particle Size ◽  
Bimetallic Nanoparticles ◽  
Structural Evolution ◽  
Blue Shift ◽  
Bimodal Distribution ◽  
Tetraethylene Glycol ◽  
Microwave Assisted Synthesis ◽  
Potassium Iodide Solution ◽  
Microwave Assisted ◽  
Vis Spectroscopy

ABSTRACTBimetallic nanoparticles (NPs), particularly Au/Pd and Au/Pt, have attracted extensive attention due to their wide-spread application in catalysis, optoelectronics and energy recuperation.[1] Here we have attempted the fabrication of Au/Pt and Au/Pd bimetallic NPs by an energy-efficient eco-friendly microwave methodology. The microwave-assisted reactions enable considerably large product yields over conventional colloidal methods due to (a) almost two-fold increased reaction kinetics, (b) localized superheating at reaction sites and rapid rise of initial temperature.[2] Au NPs (sizes 20 ± 3 nm) are fabricated in the first step followed by the reduction of [PdCl2(NH3)2] or [K2PtCl6]in tetraethylene glycol at 180 ºC for 2 min. Controlling and understanding the atomic structure and elemental distributions of these NPs are crucial for their optimized performances. So, we address the fundamental question of the most likely arrangement of Au and Pd or Pt atoms in these bimetallic NPs prepared under similar conditions by complementary characterizations using UV-Vis spectroscopy, X-ray diffraction (XRD) and transmission electron microscopy (TEM). The UV-Vis spectroscopy reveals the formation of an alloy shell. The extent of depression of the plasmon peak of Au and its blue-shift reveals substantial deposition of Pd atoms on an Au core and significant alloying in comparison to Au/Pt NPs. XRD reveals the gradual shift of the diffraction peak from the position of Au to the position of Pd or Pt with change in composition. XRD supports the formation of a thick alloy shell in these NPs. However, the TEM images reveal a very interesting result. With increase in Pt concentration, the size of the dispersed NPs decreases from 20 ± 3 nm to about 16 nm (± 1 nm) and there is evolution of a bimodal particle size distribution with small particles about 1-2 nm diameters. On the contrary, with increasing Pd concentration, the particle size of the dispersed particles increases to about 32 nm (± 1 nm). This discrepancy of particle size evolution for the two systems arises due to the differences in surface energies (Pt > Pd > Au atoms). Pt atoms tend to diffuse towards the core with the formation of Au nano-islands which eventually segregates leading to a reduction in particle size and bimodal distribution. At higher concentration of Pt, Pt and Au atoms tend to nucleate separately also contribute to the bimodal distribution. While for Au/Pd NPs, we have an Au core with an alloyed shell having higher Pd concentration. This is further supported by experimental evidence by selective etching and dissolution of Au by potassium-iodide solution. Furthermore, the Au/Pd bimetallic NPs are found to possess better catalytic activities in the reduction of 4-nitrophenol to 4-aminophenol than Au/Pt and monometallic NPs.

FABRICATION AND CHARACTERIZATION OF NANOSTRUCTURED CU-15WT.% MO COMPOUND BY MECHANICAL ALLOYING

2012 ◽  
Vol 05 ◽  
pp. 456-463
Author(s):  
Soheil Sabooni ◽  
Tayebeh Mousavi ◽  
Fathallah Karimzadeh
Keyword(s):  
Solid Solution ◽  
Mechanical Alloying ◽  
Structural Evolution ◽  
Weight Percent ◽  
Chromium Steel ◽  
X Ray Diffraction ◽  
Milling Operation ◽  
Powder Particles ◽  
Solid Solution Matrix

In the present study nanostructured Cu ( Mo ) compound with 15 weight percent Mo was produced by mechanical alloying using a planetary ball mill. The milling operation was carried out in hardened chromium steel vial and balls under argon atmosphere with a constant ball to powder ratio of 10:1. The structural evolution and characterization of powder particles after different milling times were studied by X-Ray Diffraction, SEM observation and Microhardness measurements. The results showed the displacement of broadened Cu peaks to lower angles, because of dissolving Mo in Cu . The final product was a nanocomposite contains nanocrystalline Cu ( Mo ) supersaturated solid solution matrix and dispersion of nanometric Mo reinforcements. The microhardness of formed nanocomposite increased to 350HV because of grain refinement, formation of solid solution and dispersion hardening.

Polymorphism of Ba1–xSrxCoO3–δ (0≤ x≤ 1) Perovskites: A Thermal and Structural Study by Neutron Diffraction

2008 ◽  
Vol 63 (6) ◽  
pp. 647-654 ◽  
Author(s):  
Cristina de la Calle ◽  
José Antonio Alonso ◽  
Maria Teresa Fernández-Díaz
Keyword(s):  
Solid Solution ◽  
Powder Diffraction ◽  
Rietveld Method ◽  
Structural Evolution ◽  
Neutron Powder Diffraction ◽  
Slow Cooling ◽  
X Ray ◽  
High Oxygen Pressure ◽  
Hexagonal Perovskites ◽  
Citrate Precursors

The preparation of different hexagonal, orthorhombic and cubic polymorphs of the solid solution Ba1−xSrxCoO3−δ (0 ≤ x ≤ 1) is described. The samples have been studied by thermal analysis (TG and DTA) to identify the phase transitions; the thermal structural evolution and the structural characterization of different phases were analyzed by X-ray and neutron powder diffraction and refined by the Rietveld method. A series of hexagonal perovskites Ba1−xSrxCoO3−δ (0 ≤ x < 0.5), labelled as “H”, were synthesized by thermal treatment of reactive citrate precursors at 900 °C in high oxygen pressure followed by slow cooling to r. t. The hexagonal perovskites with 0.5 ≤ x ≤ 1 were obtained from the citrate precursors heated twice at 900 °C in air and slowly cooled in the furnace. Orthorhombic brownmillerite-like structures, labelled “O”, were obtained from precursors with composition 0.5 ≤ x ≤ 1 by quenching in liquid N2 from 900 °C. For x < 0.5, quenching from high temperatures does not stabilize the “O” phases. The crystal structure for both terms of the solid solution (x = 0 and x = 1) has been investigated by neutron powder diffraction. DTA and X-ray thermo-diffractometry show that “H” phases experience a reconstructive transition at ca. 900 °C to give cubic “C” polymorphs.

Structural evolution in 0.67(Sm Bi1−)FeO3-0.33BaTiO3 solid solution and its effect on multiferroic properties at room temperature

2019 ◽  
Vol 230 ◽  
pp. 100-106 ◽  
Author(s):  
Y. Li ◽  
Y.G. Wang ◽  
L. Zhu ◽  
S.D. Zhou ◽  
H. Wu
Keyword(s):  
Solid Solution ◽  
Room Temperature ◽  
Structural Evolution ◽  
Multiferroic Properties
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