Physical and Chemical Properties of Rare Earth Oxides

Imanaka, Nobuhito

doi:10.1007/1-4020-2569-6_5

Cited by 10 publications

(12 citation statements)

References 55 publications

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“…Rare-earth oxides are known to be good ionic conductors [13]. Ionic conductance takes place via the oxygen vacancies, and although it is usually observed at high temperatures, we can not rule out this mechanism of carrier transport.…”

Section: Methodsmentioning

confidence: 77%

“…(2) we determine the density of states at the Fermi level N(E F ). The values of bulk density of states N(E F ) and of hopping activation energy W for three measured samples are presented in Table. The physical origin of the states being the hopping sites inside the dielectric layer is still discussed, but most often the deep levels in the high k  materials are associated with oxygen vacancies and interstitials randomly distributed in the dielectric film [1,13,19]. The role of oxygen related defects as carrier traps in high k  dielectrics HfO 2 and ZrO 2 is discussed in [20][21][22].…”

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confidence: 99%

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Current transport mechanisms in metal – high-k dielectric – silicon structures

Gomeniuk¹

2012

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. The mechanism of current transport in several high k  -dielectric, including rare earth metal oxides (Gd 2 O 3 , Nd 2 O 3 ), ternary compounds (LaLuO 3 ) and rare earth metal silicate (LaSiO x ) thin films on silicon was studied using current-voltage ( V I  ) and conductance-frequency (   G  ) measurements at temperatures 100-300 K. It was shown that the current through the dielectric layer is controlled either by Pool-Frenkel mechanism of trap-assisted tunneling or by Mott's variable range hopping conductance through the localized states near the Fermi level. From the results of measurements, the dynamic dielectric constant k of the material, energy positions and bulk concentrations of traps inside the dielectric layers were determined.

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Section: Methodsmentioning

confidence: 77%

mentioning

confidence: 99%

Current transport mechanisms in metal – high-k dielectric – silicon structures

Gomeniuk¹

2012

Semicond. Phys. Quantum Electron. Optoelectron.

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“…The endothermic and exothermic peaks specifically appear on the DSC curve at 125.49 and 749.37 °C, respectively. Herein, the weight loss after annealing is attributed to the water removal from the surface, resulting from the crystallization and dehydration of Fe2O3.xH2O (x = 1-5) [21] and HoO(OH).yH2O [22]. Hence, the temperatures of 650, 750, 850 and 950 °C, were chosen for investigating structure and morphology of HoFeO3 na- The endothermic and exothermic peaks specifically appear on the DSC curve at 125.49 and 749.37 • C, respectively.…”

Section: Resultsmentioning

confidence: 99%

Low-Temperature Co-Precipitation Synthesis of HoFeO3 Nanoparticles

Mai

Tiến

2021

Crystals

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In this research, we investigate and discuss the characteristics of HoFeO3 nanoparticles synthesized by the co-precipitation method at low temperature (t° ≤ 4 °C). The single-phase HoFeO3 samples with the orthorhombic structure formed after annealing of the precipitates at different temperatures up to 950 °C. The annealed HoFeO3 nanoparticles have an average crystal size of 10–20 nm (SEM, TEM). UV-Vis spectrum of HoFeO3 sample annealed at 750 °C showed strong UV and Vis absorption with small optical energy gap (Eg = 1.56 eV). In the range temperature of 100–300 K, the HoFeO3 samples showed superparamagnetic behaviour at 5 kOe with high magnetization (Ms = 1.3–2.4 emu/g) and very low susceptibility (χ << 1).

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“…Accordingly, the initial weight loss (∼7.6%) starts at 60°C, yields a maximum value at 107°C and finishes at ∼240°C. An endothermic peak arises on the DSC curve at 107°C, which can be attributed to the loss of surface [25,26]. In addition, in the temperature interval from 600 to 650°C there is an exothermic peak with maximum at 619°C indicating formation of perovskite phase.…”

Section: Thermal Analysismentioning

confidence: 99%

“…For the pure Pr-based sample, the stable Pr 6 O 11 phase was generated after annealing the hydroxide praseodymium precipitate instead of the unstable Pr 2 O 3 phase. This is clearly explained by the following equation [25]:…”

Section: Structure and Morphologymentioning

confidence: 99%

Crystal structure, optical and magnetic properties of PrFeO3 nanoparticles prepared by modified co-precipitation method

Tiến

Tram

Yakovlevna

et al. 2020

PAC

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In this work, PrFeO3 nanoparticles were synthesized by modified co-precipitation method and annealed at different temperatures up to 850?C. The annealed PrFeO3 nanoparticles have single phase orthorhombic structure and the average particle size of 25-30 nm. Due to the very small particle size the prepared PrFeO3 nanoparticles are capable of being used as photocatalyst materials thanks to their strong adsorption bands at 230-400 nm and 400-800 nm observed from the UV-Vis spectra. Additionally, the PrFeO3 nanoparticles are paramagnetic materials with Hc ~ 10Oe and Mr ~ 0. These findings demonstrate their potential use not only as photocatalysts, but also as magnetic materials.

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Physical and Chemical Properties of Rare Earth Oxides

Cited by 10 publications

References 55 publications

Current transport mechanisms in metal – high-k dielectric – silicon structures

Current transport mechanisms in metal – high-k dielectric – silicon structures

Low-Temperature Co-Precipitation Synthesis of HoFeO3 Nanoparticles

Crystal structure, optical and magnetic properties of PrFeO3 nanoparticles prepared by modified co-precipitation method

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