ChemInform Abstract: Hydrothermal Synthesis and Structure of a Potassium Tantalum Defect Pyrochlore.

ChemInform ◽  
2010 ◽  
Vol 29 (47) ◽  
pp. no-no
Author(s):  
N. DUAN ◽  
Z.-R. TIAN ◽  
W. S. WILLIS ◽  
S. L. SUIB ◽  
J. M. NEWSAM ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Defect Pyrochlore

Hydrothermal Synthesis and Structure of a Potassium Tantalum Defect Pyrochlore

1998 ◽  
Vol 37 (18) ◽  
pp. 4697-4701 ◽  
Author(s):  
Niangao Duan ◽  
Zheng-Rong Tian ◽  
William S. Willis ◽  
Steven L. Suib ◽  
John M. Newsam ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Defect Pyrochlore

scholarly journals Hydrothermal synthesis of perovskite and pyrochlore powders of potassium tantalate

2002 ◽  
Vol 17 (12) ◽  
pp. 3168-3176 ◽  
Author(s):  
Gregory K. L. Goh ◽  
Sossina M. Haile ◽  
Carlos G. Levi ◽  
Fred F. Lange
Keyword(s):  
Hydrothermal Synthesis ◽  
Perovskite Structure ◽  
Charge Compensation ◽  
Stable Phase ◽  
Water Molecules ◽  
Potassium Tantalate ◽  
Defect Pyrochlore

Potassium tantalate powders were hydrothermally synthesized at 100 to 200 °C in 4 to 15 M aqueous KOH solutions. A defect pyrochlore, Kta2O5(OH). nH2O (n ≈ 1.4), was obtained at 4 M KOH, but at 7–12 M KOH, this pyrochlore was gradually replaced by a defect perovskite as the stable phase. At 15 M KOH, there was no intermediate pyrochlore, only a defect perovskite, 0.85Ta0.92O2.43(OH)0.57 0.15H2O. Synthesis at higher KOH concentrations led to greater incorporation of protons in the perovskite structures. The potassium vacancies required for charge compensation of incorporated protons could accommodate water molecules in the perovskite structure.

Synthesis of hydrated KTaWO6 nanoparticles and Sn(ii) incorporation for visible light absorption

Nanoscale ◽  
2018 ◽  
Vol 10 (20) ◽  
pp. 9691-9697 ◽  
Author(s):  
Morten Weiss ◽  
Roland Marschall
Keyword(s):  
Hydrothermal Synthesis ◽  
Visible Light ◽  
Light Absorption ◽  
Visible Light Absorption ◽  
Single Crystalline ◽  
Crystallite Sizes ◽  
Defect Pyrochlore

The defect-pyrochlore stuctured semiconductor KTaWO6 has been prepared via hydrothermal synthesis, resulting in single-crystalline nanoparticles with adjustable crystallite sizes between 15 and 24 nm.

Hydrothermal synthesis of MoS 2 nanoflowers and their capacitive property

2019 ◽  
Vol 14 (5) ◽  
pp. 493-495 ◽  
Author(s):  
Qinghua Yang ◽  
Chunni Xiao ◽  
Bingbing Chen ◽  
Lin Ma ◽  
Limei Xu
Keyword(s):  
Hydrothermal Synthesis ◽  
Capacitive Property

Hydrothermal Synthesis and Solid-State Laser Refrigeration of Ytterbium-Doped Potassium Lutetium Fluoride (KLF) Microcrystals

2020 ◽  
Author(s):  
Xiaojing Xia ◽  
Anupum Pant ◽  
Xuezhe Zhou ◽  
Elena Dobretsova ◽  
Alex Bard ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Solid State ◽  
Information Science ◽  
Point Group ◽  
Solid State Laser ◽  
Lanthanide Ions ◽  
Group Symmetry ◽  
Luminescence Spectra ◽  
Crystalline Phases ◽  
State Laser

Fluoride crystals, due to their low phonon energies, are attractive hosts of trivalent lanthanide ions for applications in upconverting phosphors, quantum information science, and solid-state laser refrigeration. In this article, we report the rapid, low-cost hydrothermal synthesis of potassium lutetium fluoride (KLF) microcrystals for applications in solid-state laser refrigeration. Four crystalline phases were synthesized, namely orthorhombic K<sub>2</sub>LuF<sub>5</sub> (Pnma), trigonal KLuF<sub>4</sub> (P3<sub>1</sub>21), orthorhombic KLu<sub>2</sub>F<sub>7</sub> (Pna2<sub>1</sub>), and cubic KLu<sub>3</sub>F<sub>10</sub> (Fm3m), with each phase exhibiting unique microcrystalline morphologies. Luminescence spectra and emission lifetimes of the four crystalline phases were characterized based on the point-group symmetry of trivalent cations. Laser refrigeration was measured by observing both the optomechanical eigenfrequencies of microcrystals on cantilevers in vacuum, and also the Brownian dynamics of optically trapped microcrystals in water. Among all four crystalline phases, the most significant cooling was observed for 10%Yb:KLuF<sub>4</sub> with cooling of 8.6 $\pm$ 2.1 K below room temperature. Reduced heating was observed with 10%Yb:K<sub>2</sub>LuF<sub>5</sub>

Hydrothermal Synthesis and Photocatalytic Properties of Cu-doped BiVO4 Microsheets

2013 ◽  
Vol 28 (3) ◽  
pp. 287-294 ◽  
Author(s):  
Guo-Cong LIU ◽  
Zhen JING ◽  
Xi-Bing ZHANG ◽  
Xian-Feng LI ◽  
Hong LIU
Keyword(s):  
Hydrothermal Synthesis ◽  
Photocatalytic Properties
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