lanthanum hafnium us20070037415

Lanthanum-Doped Hafnium Oxide: A Robust …

Abstract. Recently simulation groups have reported the lanthanide series elements as the dopants that have the strongest effect on the stabilization of the ferroelectric non …

Lanthanum-Doped Hafnium Oxide: A Robust Ferroelectric Material.

Lanthanum doping induced structural changes and their implications on ferroelectric properties of Hf1−xZrxO2 thin film. Multiple polymorphs coexist in doped HfO2 ferroelectric material, and their relative fraction depends on the dopant concentration. The ferroelectric properties originate only from the polar….

Determination of ultra-trace amounts of arsenic(III) by …

It was shown that As(III) is more effectively collected by lanthanum hydroxide than by hafnium hydroxide, the sensitivity achieved by the former being approximately 25% better. With optimal experimental conditions and with a sample consumption of 6.7 ml per assay, an enrichment factor of 32 was obtained at a sample frequency of 33 samples h(-1

Lanthanum-Doped Hafnium Oxide: A Robust Ferroelectric …

Lanthanum-Doped Hafnium Oxide: A Robust Ferroelectric Material. Schroeder U 1, Richter C 1, Park MH 1, Schenk T 1, Pešić M 1, Hoffmann M 1, Fengler FPG ... This finding confirms experimental results for lanthanum and gadolinium showing the highest remanent polarization values of all hafnia-based ferroelectric films until now. …

Mineral Resource of the Month: Hafnium

Wednesday, June 13, 2018. George Bedinger, a mineral commodity specialist for the U.S. Geological Survey, compiled this information on hafnium, a metal used in super­alloys and the nuclear industry. Hafnium …

Characteristics of high-k dielectric ECR-ALD lanthanum hafnium …

Section snippets Experimental details. LHO films were deposited on p-Si substrates by using ECR-ALD with La(iPrCp) 3 and TEMAHf as the lanthanum and hafnium precursors, respectively, and O 2 plasma as an oxygen source. The temperatures of the La(iPrCp) 3 and the TEMAHf were maintained at 150 °C and 60 °C, respectively. …

Thermal stability of lanthanum in hafnium-based gate …

Hafnium aluminate (HfAlO) and nitrided hafnium aluminate (HfAlON) dielectrics were sputter deposited on Si (100) substrate. The N2/(N2+Ar) flow ratio was varied between 0 and 66.6% in order to ...

The Ir-La (Iridium-Lanthanum) system | Journal of Phase …

The Ir-La (Iridium-Lanthanum) system. Published: 01 October 1991. Volume 12, pages 565–567, ( 1991 ) Cite this article. Download PDF. Journal of Phase Equilibria. H Okamoto. 94 Accesses. 4 Citations.

Ferroelectric and Antiferroelectric Phenomenon in Lanthanum …

Hafnium lanthanum oxide (HLO) thin film, known for their excellent ferroelectric properties, have emerged as a promising strategy for future non-volatile memory (NVM) applications. In this letter, we systematically investigate the impact of Zr doping on the ferroelectric behavior and endurance of HLO thin films for the first time. …

Phase transitions in ferroelectric silicon doped hafnium oxide

We investigated phase transitions in ferroelectric silicon doped hafnium oxide (FE-Si:HfO2) by temperature dependent polarization and x-ray diffraction measurements. If heated under mechanical confinement, the orthorhombic ferroelectric phase reversibly transforms into a phase with antiferroelectric behavior. Without …

Molten-Salt Synthesis of Complex Metal Oxide …

2. Add the diluted ammonia solution in the burette into the stirring solution of lanthanum nitrate and hafnium dichloride oxide dropwise. 3. Adjust the dropping speed of the ammonia solution accordingly so that it will be added over a period of 2 h. 4. After several mL of ammonia solution have been delivered, ensure that the solution becomes ...

How do you account the larger size of lanthanum than hafnium …

Solution. Verified by Toppr. Lanthanum is the first element of 3rd series of transition elements. The differentiating electron goes into '5d' subshell. Though hafnium is present next to lanthanum, its atomic number is 72. That means, there is a large difference in nuclear charge. Though 14 electrons are added to the inner shell, the poor ...

Periodic Table Element Comparison | Compare Lanthanum …

Lanthanum: Yttrium: History: The element : Lanthanum was discovered by G. Mosander in year 1838 in Sweden. Lanthanum derived its name from the Greek lanthanein, meaning 'to lie hidden'.The element : Yttrium was discovered by J. Gadolin in year 1794 in Finland. Yttrium derived its name from Ytterby, Sweden.Discovery: G. Mosander (1838)J. Gadolin ...

Wake-Up Mechanisms in Ferroelectric Lanthanum …

The lanthanum-doped hafnium/zirconium mixed oxide system is of broad interest due to its high endurance stability and low crystallization …

Vaporization and thermodynamic properties of …

The superfine lanthanum hafnate powder was synthesized by the glycol-citrate method. The phase transitions and the changes of microstructure of the La 2 Hf 2 …

Impact of oxygen vacancy on the ferroelectric properties of lanthanum

The discovery of ferroelectric properties in hafnium oxide has brought back the interest in the ferroelectric non-volatile memory as a possible alternative for low power consumption electronic memories. As far as real hafnium oxide-based materials have defects like oxygen vacancies, their presence might affect the ferroelectric properties due to oxygen …

Synthesis of nanoparticles of barium lanthanum hafnium …

Abstract. Barium lanthanum hafnium oxide, a complex perovskite ceramic, has been synthesized as nanoparticles by a modified combustion process for the first time. The Ba, La, and Hf ions required for the formation of Ba2LaHfO5.5 were obtained in solution by dissolving in boiling nitric acid a stoichiometric mixture of BaCO3, La2O3, and HfO2 ...

Synthesis of Nanoparticles of Barium Lanthanum Hafnium …

Barium lanthanum hafnium oxide, a complex perovskite ceramic, has been synthesized as nanoparticles by a modified combustion process for the first time. The Ba, La, and Hf ions required for the ...

Lanthanum-Doped Hafnium Oxide: A Robust Ferroelectric Material

Here, by structure evolution between fluorite HfO 2 and perovskite hafnate who have similar metal sublattices, we create an amorphous hafnium-based oxide that exhibits a giant U rec of ~155 J/cm ...

Lanthanides: Properties and Reactions

Elements Lanthanum (57) through Lutetium (71) on the periodic table are considered to be Lanthanides. Lanthanides tend to react with oxygen to form oxides. The …

Atomic Layer Deposition of Lanthanum Stabilized Amorphous Hafnium Oxide

Abstract. Hafnium dioxide deposited on n-Si (100) by atomic layer deposition (ALD) was incorporated with La2O3 to stabilize the amorphous phase during high-temperature annealing. The incorporation ...

Lanthanum-Doped Hafnium Oxide: A Robust Ferroelectric Material

Abstract. Recently simulation groups have reported the lanthanide series elements as the dopants that have the strongest effect on the stabilization of the ferroelectric non-centrosymmetric orthorhombic phase in hafnium oxide. This finding confirms experimental results for lanthanum and gadolinium showing the highest …

Lanthanum, Chemical Element

Lanthanum is the third element in Row 6 of the periodic table. The periodic table is a chart that shows how chemical elements are related to each other. Lanthanum is a transition element in Group 3 (IIIB) of the periodic table. Lanthanum's position makes it one of the transition metals. The transition metals are found in the center of the ...

Impact of oxygen vacancy on the ferroelectric properties of lanthanum …

The discovery of ferroelectric properties in hafnium oxide has brought back the interest in the ferroelectric non-volatile memory as a possible alternative. Skip to Main Content. Close. Publishers . ... concentration during the endurance and to determine the optimal defect density for a higher residual polarization in lanthanum-doped hafnium …

Hafnium

Hafnium is a good absorber of neutrons and is used to make control rods, such as those found in nuclear submarines. It also has a very high melting point and because of this is used in plasma welding torches. Hafnium has been successfully alloyed with several metals including iron, titanium and niobium.

Wake-Up Mechanisms in Ferroelectric Lanthanum-Doped Hf

The lanthanum-doped hafnium/zirconium mixed oxide system is of broad interest due to its high endurance stability and low crystallization temperature which is necessary for low thermal budget, back-end of line devices. Herein, a detailed temperature-dependent field-cycling study is performed in a wide temperature range from liquid nitrogen to ...

High-k Gate Dielectric

Lanthanum Doped Hf-Based High-k Oxides 16 5. Conclusion 18 6. References 19 . 3 Hafnium-based High-k Gate Dielectric 1. Introduction Among the three main components of the transistor – gate stack, source/drain, and channel length; gate stack has been the most sophisticated and sensitive part for it performance, yield and reliability. ...

Thermodynamic properties of lanthanum, …

The starting reagents were hafnium oxide-dichloride octahydrate and lanthanum (or gadolinium) nitrate octahydrate dissolved in the stoichiometric …

Effect of Annealing Temperature on the Microstructure and …

Optical Properties of Lanthanum-Doped Hafnium Oxide. Xiangduo Cui 1,2, Kamale T uokedaerhan 1,2, *, Haotian Cai 1,2 and Zhenchuan Lu 1,2. 1 Xinjiang Key Laboratory of Solid State Physics and ...

Effect of Annealing Temperature on the Microstructure …

Abstract: Lanthanum-doped HfO2 films were deposited on Si by sol–gel technology. The effects of annealing temperature on the optical properties, interface chemistry, and energy band structure of Lanthanum-doped HfO2 films have been investigated. The crystallinity and surface morphologies

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