US6447910B1 - Barium titanate particles with surface ...

Disclosed is a powder consisting of composite barium titanate particles having surface deposition of a water-insoluble rare earth compound such as yttrium oxide. The powder is used advantageously as a base material for the preparation of a sintered body such as ceramic capacitors of small thickness or compact size as compared with conventional powder blends of barium titanate particles and ...

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Luminescence characteristics of rare-earth-doped barium ...

Nov 26, 2018· Fluorides are promising host materials for optical applications. This paper reports the photoluminescent (PL) and cathodoluminescent (CL) characteristics of barium hexafluorogermanate BaGeF6 nanowires codoped with Ce3+, Tb3+ and Sm3+ rare earth …

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Luminescence characteristics of rare-earth-doped barium ...

Nov 26, 2018· @article{osti_1483339, title = {Luminescence characteristics of rare-earth-doped barium hexafluorogermanate BaGeF 6 nanowires: fast subnanosecond decay time and high sensitivity in H 2 O 2 detection}, author = {None, None}, abstractNote = {The decay time of BaGeF6nanowires codoped with rare earths is found in the order of subnanoseconds, being one of the shortest decay time records …

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The Geology of Rare Earth Elements

The resulting alkaline magmas are rare and unusually enriched in elements such as zirconium, niobium, strontium, barium, lithium, and the rare earth elements. When these magmas ascend into the Earth's crust, their chemical composition undergoes further changes in response to variations in pressure, temperature, and composition of surrounding rocks.

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Method for harvesting rare earth barium copper oxide ...

Jan 01, 1996· Method for harvesting rare earth barium copper oxide single crystals. Patent Todt, V R; Sengupta, S; Shi, D. A method of preparing high temperature superconductor single crystals is disclosed. The method of preparation involves preparing precursor materials of a particular composition, heating the precursor material to achieve a peritectic ...

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CN101509094A - Silicon-aluminum-barium-calcium rare earth ...

The invention provides an Si-Al-Ba-Ca rare-earth ferroalloy used for steel-making, which adopts silica, alumina, barite, quicklime or calcium carbide as raw materials and carbon as a reducing agent and is formed by smelting the materials and the agent in a submerged arc furnace. The proportioning by weight of the chemical composition is as follows: 30-50% of silicon, 5-30% of aluminum, 5-30% ...

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Effect of rare earth dopants on the radiation shielding ...

Jun 12, 2021· Rare earth doped barium tellurite glasses have been subjected to thermal analysis and their thermal parameters like glass transition temperature and peak crystallization temperature were measured from which the thermal stability of the samples was calculated. Measurements were within an accuracy of ±2 °C.

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What are rare earth elements? | Earth | EarthSky

Aug 21, 2018· An electron diagram of a barium element, the last element before the lanthanide rare earth elements. Image via Greg Robson and Pumbaa . …

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Review on dielectric properties of rare earth doped barium ...

Jul 19, 2016· Rare earth doped Barium Titanate (BaTiO{sub 3}) were studied due to high permittivity, excellent electrical properties and have wide usage in various applications. This paper reviewed on the electrical properties of RE doped BaTiO{sub 3} (RE: Lanthanum (La), Erbium (Er), Samarium (Sm), Neodymium (Nd ...

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Effect of rare-earth additions on the structure and ...

Jun 15, 2016· In this study, the light rare-earth oxide La 2 O 3, the middle rare-earth oxide Gd 2 O 3 and the heavy rare-earth oxide Yb 2 O 3 were chosen to be added in barium strontium titanate based barium boroaluminosilicate glass-ceramics (BST-BBAS) in order to investigate the effect of rare-earth additions on energy storage properties. 2. Experimental ...

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Rare-earth element - Wikipedia

The rare-earth elements, also called the rare-earth metals or (in context) rare-earth oxides, or the lanthanides (though yttrium and scandium are usually included as rare-earths) are a set of 17 nearly-indistinguishable lustrous silvery-white soft heavy metals. Scandium and yttrium are considered rare-earth elements because they tend to occur in the same ore deposits as the lanthanides and ...

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Mixed-dimensional modeling of delamination in rare earth ...

Jun 13, 2018· The high temperature superconducting (HTS) rare earth-barium-copper-oxide (REBCO) coated conductors are promising conductors for high energy, high field and HTS applications such as magnetic energy storage and nuclear magnetic resonance and fusion reactors [1–6].Although REBCO conductors possess excellent uniaxial tension strength due to their strong substrates, fabrication, …

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Rare earth element-bearing tausonite and potassium barium ...

Rare earth element-bearing tausonite and potassium barium titanates from the Little Murun potassic alkaline complex, Yakutia, Russia - Volume 57 Issue 389

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Rare-earth barium copper oxide - Wikipedia

Rare-earth barium copper oxide (also referred to as ReBCO) is a family of chemical compounds known for exhibiting high temperature superconductivity. ReBCO superconductors have the potential to sustain stronger magnetic fields than other superconductor materials.

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Crystal chemistry and the role of ionic radius in rare ...

Oct 01, 2017· Structural variations across a series of barium rare earth (RE) tetrasilicates are studied. Two different formulas are observed, namely those of a new cyclo-silicate fluoride, BaRE2Si4O12F2 (RE = Er3+-Lu3+) and new compounds in the Ba2RE2Si4O13 (RE = La3+-Ho3+) family, covering the whole range of ionic radii for the rare earth ions.

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Studies of dielectric properties of rare earth (Dy, Tb, Eu ...

Jan 01, 2012· The grains become smaller when the rare earth (Dy, Tb, Eu) entered into barium titanate crystal structure. Especially in the Eu-doped samples, the grains were homogeneous and no more than 1 μm. This may be related to the fact that the intermediate rare earth element Eu 3+ was substituted in the A-site of the perovskite lattice (8–9, 12).

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Barium cerates co-doped by rare-earth elements and indium ...

Aug 01, 2019· Barium cerates doped by rare-earth elements can be used as trap for nuclear reactors, since they include rare-earth oxides that effectively absorb neutrons . As known in an irradiated nuclear fuel, a number of fission products are produced and they affect the fuel performance. Especially the fission products precipitated in the fuel matrix ...

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Rare Earth Products manufactures high purity Barium ...

Rare Earth Products manufactures barium oxides chloride nitrate carbonate acetate sulfate and triflate of europium terbium scandium erbium ytterbium yttrium praseodymium lutetium thulium gadolinium neodymium samarium barium holmium lanthanum.

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Study the structural and magnetic properties of rare-earth ...

Barium titanate (BaTiO 3) is a well-known ferroelectric pe-rovskite material. Due to their high dielectric constant, low dielectric loss, and excellent electrical properties, BaTiO 3-based ceramics are universally used for multilayer ceramic capacitors (MLCCs).1,2 Among rare earth dopants have a significant effect on the fabrication of MLCCs ...

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Investigation of Rare‐Earth Doped Barium Titanate ...

In this study the effect of additions of 0.0015 to 0.0030 mole fraction of rare-earth oxides on the d.-c. resistivity of sintered barium titanate was investigated. The substitution may be represented by (X 2 O 3) M (BaTiO 3) 1-M where X is the rare earth. The rare earths samarium, gadolinium, and holmium were introduced singly into the titanate ...

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RETRACTED ARTICLE: Optical properties of rare earth-doped ...

Aug 06, 2013· The present paper reports the general features of luminescence and various characterization techniques and mainly focused on the review of optical studies of rare earth (RE)-doped barium aluminate phosphor (BaAl 2 O 4).The paper is a short review of various methods of preparation of this phosphor and its characterization by thermoluminescence, photoluminescence, …

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Facts About Barium | Live Science

Nov 07, 2017· About 0.05 percent of Earth's crust is barium, making it the 17th most abundant element in the crust, according to Robert E. Krebs in his book, "The History and Use of Our Earth's Chemical ...

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Rare earth doped M-type hexaferrites; ferromagnetic ...

Jan 19, 2018· The room temperature magnetic hysteresis (M-H) curves for rare-earth doped Barium hexaferrite (BaM) are shown in Fig. 1(b). In the present investigation, values of both saturation magnetization (M s ) and coercivity (H c ) of hexaferrites decrease with the substitution of rare earth …

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Photochromism of rare earth doped barium haloapatite ...

Jan 01, 2013· The rare earth ions are supposed to replace barium, since they have similar ionic radii and valences. In view of the small doping ratio, according to Vegard's law, the substitution can only result in little lattice parameter shift or peak shift.

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Barium rare-earth zirconates: Synthesis, characterization ...

Barium rare-earth zirconates: Synthesis, characterization and their possible application as substrates for YBa 2 Cu 3 O 7-delta superconductors

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US20040041126A1 - Spherical particles of rare earth ...

Spherical particles of a rare earth activated barium fluoride halide phosphor precursor having the formula(I): Ba 1-a M II a FX:yM I, zLn (I) [in which M II is Ca or Sr; M I is Li, Na, K, Rb or Cs; X is Cl, Br or I; Ln is a rare earth element; and a, y and z are numbers satisfying the conditions of 0≦a≦0.5, 0≦y≦0.05, and 0 Read more

Rare earth-doped barium gallo-germanate glasses and their ...

Rare earth-doped barium gallo-germanate glasses and their near-infrared luminescence properties Spectrochim Acta A Mol Biomol Spectrosc. 2018 Aug 5;201:362-366. doi: 10.1016/j.saa.2018.05.027. Epub 2018 May 8. Authors Joanna Pisarska 1 ...

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Thermal and light emission properties of rare earth (Eu3 ...

Jun 04, 2021· The effects of rare earth, alkali and Al ions on the thermal, short-range structure, optical absorption and emission properties of barium tellurite and barium boro-tellurite glasses are studied. The glass transition temperature and density correlate with the average single bond energy of the glass network and the molecular mass of the constituents, respectively. Glasses containing Eu3+ shows ...

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Production of barium and light rare earth element oxides ...

Production of barium and light rare earth element oxides during LA-ICP-MS microanalysis Adam J. R. Kent*a and C. A. ''Andy'' Ungererb a Department of Geosciences, Oregon State University, Corvallis, OR 97331-5506, USA. E-mail: [email protected]; Fax: +1 541 7371200; Tel: +1 541 7371205

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Rare earth barium cobaltites: potential candidates for low ...

Feb 19, 2020· 10%· As mentioned earlier, manganese based rare earth barium oxides have been studied extensively in the literature for oxygen storage applications [17, 19, 20].Only limited studies on cobalt based rare earth barium oxides are available in the literature, which are inclined towards high temperature (> 973 K) membrane separation [25, 26] or cathodes for solid oxide fuel …

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(PDF) Influence of Rare-Earth Dopants on Barium Titanate ...

The amphoteric behavior of these rare-earth ions leads to the increase of dielectric permittivity and decrease of dielectric losses. BaTiO3-ceramics doped with 0.01 up to 0.5 wt % of Yb2O3 and Er2O3 were prepared by conventional solid state procedure and sintered up to 1320oC for four hours.

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Separation of Rare Earth Elements in Geological Samples ...

Jul 21, 2021· Rare earth elements (REE) are important tools in geological studies. Accurate determination of REE concentrations can be affected in geological samples with low REE levels and/or high levels of interfering barium. Development of chemical separation methods allowing to isolate REE from other matrix components is a thorough approach to overcome this issue.

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Nanosized Pinning Centers in the Rare Earth-Barium-Copper ...

Since the discovery of high-temperature superconductivity, significant progress in the fabrication of REBCO-based (Rare Earth Barium Copper mixed Oxides) thin-films superconductors has been achieved. In our review, we described the approaches and possibilities of the improvement of superconducting properties by the introduction of nanosized pinning centers.

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