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 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.

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.

Effects of composition modulation on the luminescence properties of Eu3+ doped Li1−xAgxLu(MoO4)2 solid-solution phosphors

2015 ◽  
Vol 44 (41) ◽  
pp. 18078-18089 ◽  
Author(s):  
Fangrui Cheng ◽  
Zhiguo Xia ◽  
Maxim S. Molokeev ◽  
Xiping Jing
Keyword(s):  
Solid Solution ◽  
Structural Evolution ◽  
Luminescence Properties ◽  
Double Molybdate ◽  
Composition Modulation

The composition, structural evolution and luminescence properties of double molybdate scheelite-type solid-solution phosphors Li1−xAgxLu1−y(MoO4)2:yEu3+ have been studied.

Structural investigation and scintillation properties of Cd1−xZnxWO4 solid solution single crystals

CrystEngComm ◽  
2015 ◽  
Vol 17 (18) ◽  
pp. 3503-3508 ◽  
Author(s):  
Jingfu Zhang ◽  
Jingen Pan ◽  
Jie Yin ◽  
Jing Wang ◽  
Jianguo Pan ◽  
...  
Keyword(s):  
Solid Solution ◽  
Single Crystals ◽  
Structural Investigation ◽  
Structural Evolution ◽  
Czochralski Technique

Crystals of Cd1−xZnxWO4 (x < 0.5) were grown by the Czochralski technique. The structural evolution and scintillation properties of Cd1−xZnxWO4 samples were investigated.

Effect of Ti, Al and Cu Addition on Structural Evolution and Phase Constitution of FeCoNi System Equimolar Alloys

2012 ◽  
Vol 724 ◽  
pp. 335-338 ◽  
Author(s):  
Xiao Wang ◽  
Hui Xie ◽  
Lei Jia ◽  
Zhen Lin Lu
Keyword(s):  
Solid Solution ◽  
Structural Evolution ◽  
Atomic Radius ◽  
Xrd Analysis ◽  
Entire Solution ◽  
Vacuum Arc ◽  
Mixing Enthalpy ◽  
Phase Constitution ◽  
Mixing Entropy ◽  
Coarse Dendrite

FeCoNi system equimolar alloys were fabricated by a vacuum arc melting. The phase constitution of FeCoNi system alloys was determined by XRD analysis and the microstructure was observed by OM. The comprehensive atomic radius δ, the mixing enthalpy ΔHmix and the mixing entropy ΔSmix of alloys were also calculated according to relevant equations. The results show that the addition of Ti, Al and Cu has an obvious influence on the microstructure and phase constitution of FeCoNi system equimolar alloys. Single Ti addition resulted in almost entire solid solution with a typical dendrite growth character and a little unknown phase. However, further addition of Al, Cu or Al+Cu into the FeCoNiTi equimolar alloys led to the occurrence of an entire solution phase with dendrite, coarse dendrite, and rosette dendrite respectively. Such a phenomena suggested that the mixing entropy caused by the increase of components number rather than the comprehensive atomic radius between the elements or the mixing enthalpy of the alloy systems might be responsible for the formation of almost entire solid solution in FeCoNi system equimolar alloys.

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