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Tarini Prasad Mishra - One of the best experts on this subject based on the ideXlab platform.

  • current rate Flash sintering of gadolinium doped ceria microstructure and defect generation
    Acta Materialia, 2020
    Co-Authors: Tarini Prasad Mishra, Rubens Roberto Ingraci Neto, Rishi Raj, Olivier Guillon, Martin Bram
    Abstract:

    Abstract In current-rate Flash-sintering experiments the current is injected into the specimen from the very start and then increased at a constant rate, while the furnace is held at a constant temperature. The power supply remains under current control. The Flash is induced at low current densities which reduces local heating at the electrodes. It leads to a uniform grain size across the entire gage length of the dog-bone specimen. This work pertains to 10 mol.% gadolinium-doped ceria Flash sintered at current-rates ranging from 50 mA min−1 to 1000 mA min−1 at a furnace temperature of 680 °C. Full densities are obtained at a current density limit of 200 mA mm–2. Densification is shown to depend only on the instantaneous value of the current density, and not on the current-rate. The grain size, however, is shown to become finer at higher current-rates. A preliminary analysis of the “energy deficit”, that is, the estimated power input corresponding to the temperature as measured with a pyrometer, and the actual power consumption, estimates that huge concentrations of Frenkel defects may be introduced in the Flash Process.

  • current rate Flash sintering of doped ceria microstructure and defect generation
    2019
    Co-Authors: Tarini Prasad Mishra, Rubens Roberto Ingraci Neto, Rishi Raj, Olivier Guillon, Martin Bram
    Abstract:

    In current-rate Flash sintering the current is injected into the specimen and then increased at constant rate, while the furnace is held at a constant temperature. The Flash is induced at low current densities which to some extent obviates the reduction of the ceramic at the cathode. It leads to uniform density and microstructure across the entire gage length of the dog-bone specimen. This work pertains to 10 mol.% gadolinium-doped ceria Flash sintered at current-rates ranging from 50 mA min-1 to 1000 mA min-1 at a furnace temperature of 680 °C. Densification is shown to depend on the instantaneous value of the current density, regardless of the current-rate. The grain size, however, is shown to become finer at higher current-rates. A preliminary analysis of the "energy deficit", that is, the difference between the temperature predicted by the black body radiation model and the temperature measured with the pyrometer, estimates that huge concentrations of defects may be introduced in the Flash Process.

Martin Bram - One of the best experts on this subject based on the ideXlab platform.

  • current rate Flash sintering of gadolinium doped ceria microstructure and defect generation
    Acta Materialia, 2020
    Co-Authors: Tarini Prasad Mishra, Rubens Roberto Ingraci Neto, Rishi Raj, Olivier Guillon, Martin Bram
    Abstract:

    Abstract In current-rate Flash-sintering experiments the current is injected into the specimen from the very start and then increased at a constant rate, while the furnace is held at a constant temperature. The power supply remains under current control. The Flash is induced at low current densities which reduces local heating at the electrodes. It leads to a uniform grain size across the entire gage length of the dog-bone specimen. This work pertains to 10 mol.% gadolinium-doped ceria Flash sintered at current-rates ranging from 50 mA min−1 to 1000 mA min−1 at a furnace temperature of 680 °C. Full densities are obtained at a current density limit of 200 mA mm–2. Densification is shown to depend only on the instantaneous value of the current density, and not on the current-rate. The grain size, however, is shown to become finer at higher current-rates. A preliminary analysis of the “energy deficit”, that is, the estimated power input corresponding to the temperature as measured with a pyrometer, and the actual power consumption, estimates that huge concentrations of Frenkel defects may be introduced in the Flash Process.

  • current rate Flash sintering of doped ceria microstructure and defect generation
    2019
    Co-Authors: Tarini Prasad Mishra, Rubens Roberto Ingraci Neto, Rishi Raj, Olivier Guillon, Martin Bram
    Abstract:

    In current-rate Flash sintering the current is injected into the specimen and then increased at constant rate, while the furnace is held at a constant temperature. The Flash is induced at low current densities which to some extent obviates the reduction of the ceramic at the cathode. It leads to uniform density and microstructure across the entire gage length of the dog-bone specimen. This work pertains to 10 mol.% gadolinium-doped ceria Flash sintered at current-rates ranging from 50 mA min-1 to 1000 mA min-1 at a furnace temperature of 680 °C. Densification is shown to depend on the instantaneous value of the current density, regardless of the current-rate. The grain size, however, is shown to become finer at higher current-rates. A preliminary analysis of the "energy deficit", that is, the difference between the temperature predicted by the black body radiation model and the temperature measured with the pyrometer, estimates that huge concentrations of defects may be introduced in the Flash Process.

Juncheng Lai - One of the best experts on this subject based on the ideXlab platform.

  • full area pattern decomposition of self aligned double patterning for 30nm node nand Flash Process
    Proceedings of SPIE, 2010
    Co-Authors: Yi-shiang Chang, Jason Sweis, Juncheng Lai, Chia-chi Lin
    Abstract:

    Self Aligned Double Patterning (SADP) has the advantage of dense array definition with good pitch control and is hence useful for memory devices; but its feasibility of two-dimensional circuit patterns definition is restricted on the other hand. In SPIE 2009, we had proposed the ideas of 30nm node NAND Flash cell circuit critical feature (pickup, gate, contact array) decomposition by SADP, based on manual design. The concerns of Process integration as well as SADP alignment algorithm for each mask step were investigated and countermeasures were presented. In this paper, the previous works on manual-based pattern decomposition are extended to a more sophisticated use on full-area NAND Flash critical layer layout decomposition by utilizing an automated electronic design (EDA) tool. The decomposition tool together with OPC and simulation tools are integrated to optimize the lithographic performance of local critical patterns in each decomposed mask step, and comparisons have been made as well to investigate the differences in layout splitting algorithm between EDA-based and manual-based decomposition. Finally, the full-area (9350×12800um) layout decomposition has been successfully demonstrated on NAND Flash Gate and Metal critical layers by using the EDA tool with improved 2D structure handling algorithms.

  • pattern decomposition and Process integration of self aligned double patterning for 30nm node nand Flash Process and beyond
    Proceedings of SPIE, 2009
    Co-Authors: Yi-shiang Chang, Chia-chi Lin, Juncheng Lai, Mengfeng Tsai
    Abstract:

    As IC manufacturing goes from 45nm to 30nm node half-pitch, the lithography Process k1 factor will fall below 0.25 by using water-based ArF-immersion scanner. To bridge the gap between ArF-immersion and next generation lithography, which is not ready yet for production, Double Patterning Technology (DPT) has been evaluated and identified as a promising solution as it utilizes existing equipment and Processes. Self Aligned Double Patterning (SADP) has the advantage of dense array definition without overlay issue and is hence useful for memory device; but its characteristic restricts the feasibility of two-dimensional circuit pattern definition on the other hand. This paper describes the ideas of 30nm node NAND Flash cell circuit critical feature (pickup, gate, contact array) definition by decomposing the target patterns to SADP defined dense array in conjunction with cropping and/or periphery masks steps. The concerns and issues of cropping/periphery mask step Process integration as well as SADP alignment algorithm are investigated, and the countermeasures with alternative Process schemes and novel frame designs are presented. Finally, simulation prediction has shown that the capability of 30nm NAND Flash critical features patterning with depth of focus equal to or above 0.15um is expected at each mask step by ArF-dry lithography.

Hikari Fujii - One of the best experts on this subject based on the ideXlab platform.

  • exergoeconomic analysis and optimization of single and double Flash cycles for sabalan geothermal power plant
    Geothermics, 2018
    Co-Authors: Saeid Mohammadzadeh Bina, Saeid Jalilinasrabady, Hikari Fujii
    Abstract:

    Abstract In this study single and double Flash systems were designed to utilize the Sabalan geothermal fluid as a heat source. An Exergoeconomic model was applied on plant’ equipment in order to calculate the thermodynamic and economic performances of the cycles. Parametric analysis was done to examine the effect of important key parameters including Flash pressures and steam quality at turbine outlet on plant performance. Optimization Process for maximum net power output was carried out on the plant using direct searching method in EES (Engineering Equation Solver). This Process aimed to find the optimum Flashing pressures corresponding to the maximum potential power output as an objective function. Additionally, the major exergy destruction locations were shown graphically and side by side for both systems to observe the effect of secondary Flash Process on exergy destruction at each component. Afterward, an environmental study was done in order to calculate the amount of fossil fuel saving and pollutants emission reduction compared to conventional fossil fuel power plants. The result showed that in double Flash energy and exergy efficiency were increased from 16.26% and 40.06% to 17.73% and 50.89%, respectively. Moreover, double Flash resulted in higher net power output compared to that of single Flash (28,838 kW vs. 36,055 kW) while both cycles were using the same geofluid. Optimization results revealed that thermodynamically optimum cycle could not result the best and lower energy production cost and vice versa. Therefore, the single Flash generates electricity within lower price compared to double Flash system. Moreover, double Flash considerably reduces the required fossil fuel and various pollutants emission more than single Flash if they were replaced by fossil fuel power plants with same amount of production.

Rishi Raj - One of the best experts on this subject based on the ideXlab platform.

  • current rate Flash sintering of gadolinium doped ceria microstructure and defect generation
    Acta Materialia, 2020
    Co-Authors: Tarini Prasad Mishra, Rubens Roberto Ingraci Neto, Rishi Raj, Olivier Guillon, Martin Bram
    Abstract:

    Abstract In current-rate Flash-sintering experiments the current is injected into the specimen from the very start and then increased at a constant rate, while the furnace is held at a constant temperature. The power supply remains under current control. The Flash is induced at low current densities which reduces local heating at the electrodes. It leads to a uniform grain size across the entire gage length of the dog-bone specimen. This work pertains to 10 mol.% gadolinium-doped ceria Flash sintered at current-rates ranging from 50 mA min−1 to 1000 mA min−1 at a furnace temperature of 680 °C. Full densities are obtained at a current density limit of 200 mA mm–2. Densification is shown to depend only on the instantaneous value of the current density, and not on the current-rate. The grain size, however, is shown to become finer at higher current-rates. A preliminary analysis of the “energy deficit”, that is, the estimated power input corresponding to the temperature as measured with a pyrometer, and the actual power consumption, estimates that huge concentrations of Frenkel defects may be introduced in the Flash Process.

  • current rate Flash sintering of doped ceria microstructure and defect generation
    2019
    Co-Authors: Tarini Prasad Mishra, Rubens Roberto Ingraci Neto, Rishi Raj, Olivier Guillon, Martin Bram
    Abstract:

    In current-rate Flash sintering the current is injected into the specimen and then increased at constant rate, while the furnace is held at a constant temperature. The Flash is induced at low current densities which to some extent obviates the reduction of the ceramic at the cathode. It leads to uniform density and microstructure across the entire gage length of the dog-bone specimen. This work pertains to 10 mol.% gadolinium-doped ceria Flash sintered at current-rates ranging from 50 mA min-1 to 1000 mA min-1 at a furnace temperature of 680 °C. Densification is shown to depend on the instantaneous value of the current density, regardless of the current-rate. The grain size, however, is shown to become finer at higher current-rates. A preliminary analysis of the "energy deficit", that is, the difference between the temperature predicted by the black body radiation model and the temperature measured with the pyrometer, estimates that huge concentrations of defects may be introduced in the Flash Process.