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You searched for subject:(holmium oxide). Showing records 1 – 3 of 3 total matches.

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Iowa State University

1. Hunt, Lee Philip. Neutron activation analysis of trace rare earths in holmium oxide.

Degree: 1967, Iowa State University

Subjects/Keywords: Nuclear activation analysis; Rare earths; Holmium oxide; Analytical Chemistry

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Hunt, L. P. (1967). Neutron activation analysis of trace rare earths in holmium oxide. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/rtd/3160

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Hunt, Lee Philip. “Neutron activation analysis of trace rare earths in holmium oxide.” 1967. Thesis, Iowa State University. Accessed August 09, 2020. https://lib.dr.iastate.edu/rtd/3160.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Hunt, Lee Philip. “Neutron activation analysis of trace rare earths in holmium oxide.” 1967. Web. 09 Aug 2020.

Vancouver:

Hunt LP. Neutron activation analysis of trace rare earths in holmium oxide. [Internet] [Thesis]. Iowa State University; 1967. [cited 2020 Aug 09]. Available from: https://lib.dr.iastate.edu/rtd/3160.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hunt LP. Neutron activation analysis of trace rare earths in holmium oxide. [Thesis]. Iowa State University; 1967. Available from: https://lib.dr.iastate.edu/rtd/3160

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Luleå University of Technology

2. Agthe, Michael. Rare Earth Oxide Nanopowder (RE = Nd, Eu, Gd, Ho, Y, Yb) by Combustion Synthesis, Sulfation and Calcination : Role of the Initial Structure.

Degree: 2011, Luleå University of Technology

A novel method for synthesising rare earth oxide (RE2O3) nanopowder was applied to several rare earths including Nd, Eu, Gd, Ho, Y and Yb. The process was successful in producing homogeneous, fine dispersed and deagglomerated powder particles with uniform morphology for all rare earth oxides, except neodymia. In the first process step, rare earth nitrate solutions were mixed with glycine and subsequently heated in a furnace. Glycine acted as fuel to initiate the combustion synthesis (SHS) in order to obtain nanocrystalline and weakly agglomerated particles. Powder samples were produced at three different glycine-to-nitrate ratios (G/N), involving stoichiometric ratio (G/N = 0.56) and two fuel lean ratios (0.32 and 0.25). As a consequence of low combustion temperature at fuel lean ratios were carbonate structures found and their formation was correlated to the size of the rare earth cation. Resulting cellular structures were analysed by X-ray diffractometry (XRD) and transmission electron microscopy (TEM). The cellular structure is unsuitable to be processed to a final product. The resulting powder has a very large specific volume and is comprised of strongly agglomerated crystallites, which renders pressing and sintering of these structures difficult. Therefore an additional synthesis step was employed with the addition of ammonium sulfate and calcination for 4 h in a tube furnace at 1100°C. In order to understand the influence of the initial, cellular structure on the morphological and microstructural powder properties different sulfate concentrations were used. Samples were characterized by XRD and scanning electron microscopy (SEM). The average crystallite size increased during calcination from below 15 nm in the initial structure to 50 nm in the final product. However, the resulting particles were loosely agglomerated. A benefit of sulfate-doped rare earth compounds under heat treatment is the formation of nearly isotropic surfaces, which might be related to the promotion of surface diffusion and partial inhibition of densifying transport mechanisms such as volume diffusion.

Validerat; 20110923 (anonymous)

Subjects/Keywords: Physics Chemistry Maths; rare earth; neodymia; europia; gadolinia; holmia; yttria; ytterbia; neodymium oxide; europium oxide; gadolinium oxide; holmium oxide; yttrium oxide; ytterbium oxide; powder; combustion; synthesis; glycine; nitrate; shs; sulfation; sulfate; calcination; nano; particles; rare earth oxide; Nd; Eu; Gd; Ho; Y; Yb; Nd2O3; Eu2O3; Gd2O3; Ho2O3; Y2O3; Yb2O3; RE2O3; oxide; Fysik; Kemi; Matematik

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Agthe, M. (2011). Rare Earth Oxide Nanopowder (RE = Nd, Eu, Gd, Ho, Y, Yb) by Combustion Synthesis, Sulfation and Calcination : Role of the Initial Structure. (Thesis). Luleå University of Technology. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-59471

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Agthe, Michael. “Rare Earth Oxide Nanopowder (RE = Nd, Eu, Gd, Ho, Y, Yb) by Combustion Synthesis, Sulfation and Calcination : Role of the Initial Structure.” 2011. Thesis, Luleå University of Technology. Accessed August 09, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-59471.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Agthe, Michael. “Rare Earth Oxide Nanopowder (RE = Nd, Eu, Gd, Ho, Y, Yb) by Combustion Synthesis, Sulfation and Calcination : Role of the Initial Structure.” 2011. Web. 09 Aug 2020.

Vancouver:

Agthe M. Rare Earth Oxide Nanopowder (RE = Nd, Eu, Gd, Ho, Y, Yb) by Combustion Synthesis, Sulfation and Calcination : Role of the Initial Structure. [Internet] [Thesis]. Luleå University of Technology; 2011. [cited 2020 Aug 09]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-59471.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Agthe M. Rare Earth Oxide Nanopowder (RE = Nd, Eu, Gd, Ho, Y, Yb) by Combustion Synthesis, Sulfation and Calcination : Role of the Initial Structure. [Thesis]. Luleå University of Technology; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-59471

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


North Carolina State University

3. Jur, Jesse Stephen. Lanthanide-based Oxides and Silicates for High-K Gate Dielectric Applications.

Degree: PhD, Materials Science and Engineering, 2007, North Carolina State University

The ability to improve performance of the high-end metal oxide semiconductor field effect transistor (MOSFET) is highly reliant on the dimensional scaling of such a device. In scaling, a decrease in dielectric thickness results in high leakage current between the electrode and the substrate by way of direct tunneling through the gate dielectric. Observation of a high leakage current when the standard gate dielectric, SiO2, is decreased below a thickness of 1.5 nm requires engineering of a replacement dielectric that is much more scalable. This high- dielectric allows for a physically thicker oxide, reducing leakage current. Integration of select lanthanide-based oxides and silicates, in particular lanthanum oxide and silicate, into MOS gate stack devices is examined. The quality of the high-K dielectrics is monitored electrically to determine properties such as equivalent oxide thickness, leakage current density and defect densities. In addition, analytical characterization of the dielectric and the gate stack is provided to examine the materialistic significance to the change of the electrical properties of the devices. It is shown that optimization of low-temperature processing can result in MOS devices with an equivalent oxide thickness (EOT) as low 5 Å and a leakage current density of 5.0 A⁄cm2. High-temperature processing, consistent with a MOSFET source-drain activation anneal, yields MOS devices with an EOT as low as 1.1 nm after optimization of the TaN/W electrode properties. The decrease in the device effective work function (phi_M,eff) observed in these samples is examined in detail. First, as a La2O3 capping layer on HfSiO(N), the shift yields ideal-phi_M,eff values for nMOSFET deices (4.0 eV) that were previously inaccessible. Other lanthanide oxides (Dy, Ho and Yb) used as capping layers show similar effects. It is also shown that tuning of phi_M,eff can be realized by controlling the extent of lanthanide-silicate formation. This research, conducted in conjunction with SEMATECH and the SRC, represents a significant technological advancement in realizing 45 and sub-45 nm MOSFET device nodes. Advisors/Committee Members: Angus Kingon, Committee Chair (advisor), Gregory Parsons, Committee Member (advisor), Jon-Paul Maria, Committee Member (advisor), Mark Johnson, Committee Member (advisor).

Subjects/Keywords: dc magnetron sputtering; physical vapor deposition; tungsten oxide; tungsten; W; tantalum nitride; TaN; lanthanum; lanthanum oxide; La; La2O3; La2SiO5; lanthanum silicate; La2Si2O7; Ho; holmium; holmium oxide; cation diffusion; back-side SIMS; secondary ion mass spectroscopy; SIMS; XRD; x-ray diffraction; molecular beam deposition; PMA; XPS; x-ray photoemission spectroscopy; post metallization anneal; RCA; chemical oxide; metal oxide semiconductor field effect transistor; MBE; silica; SiO2; interfacial layer; gate dielectric; dielectric; silicate; oxide; high-kappa; EOT; equivalent oxide thickness; high-k; band diagram; valance band offset; conduction band offset; band gap energy; effective work function; work function; voltage shift; threshold voltage; flat band voltage; leakage current; capacitance; mobility; electronic materials; scaling; Moore?s Law; MIS; MOS; MOSFET; high resolution transmission electron microscopy; HRTEM; RTA; rapid thermal anneal; PVD; tantalum; Ta; gate electrode; metal electrode; hafnium silicate; hafnium oxide; hafnium; ytterbium; ytterbium oxide; Yb; dysprosium oxide; dysprosium; Dy; E-beam evaporation; thermal evaporation; forming gas anneal; ozone; ammonia anneal; FGA

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Jur, J. S. (2007). Lanthanide-based Oxides and Silicates for High-K Gate Dielectric Applications. (Doctoral Dissertation). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/5447

Chicago Manual of Style (16th Edition):

Jur, Jesse Stephen. “Lanthanide-based Oxides and Silicates for High-K Gate Dielectric Applications.” 2007. Doctoral Dissertation, North Carolina State University. Accessed August 09, 2020. http://www.lib.ncsu.edu/resolver/1840.16/5447.

MLA Handbook (7th Edition):

Jur, Jesse Stephen. “Lanthanide-based Oxides and Silicates for High-K Gate Dielectric Applications.” 2007. Web. 09 Aug 2020.

Vancouver:

Jur JS. Lanthanide-based Oxides and Silicates for High-K Gate Dielectric Applications. [Internet] [Doctoral dissertation]. North Carolina State University; 2007. [cited 2020 Aug 09]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/5447.

Council of Science Editors:

Jur JS. Lanthanide-based Oxides and Silicates for High-K Gate Dielectric Applications. [Doctoral Dissertation]. North Carolina State University; 2007. Available from: http://www.lib.ncsu.edu/resolver/1840.16/5447

.