Morphological changes and their thermal conductivities of MgO crystals containing various impurities (B, Ca, Si)

Ishikawa, Toshihiro; Tsujikura, Keiko; Tanaka, Masaki; Nishida, Norimasa; Mitani, Atsuyuki

doi:10.1111/ijac.13616

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…Magnesium oxide (MgO) has an immensely important attractive characteristics: high melting point (~ 2800 o C) [1][2][3][4], good chemical resistance [4][5][6], low dielectric constant [7,8], high electrical resistance [5], low thermal conductivity [6], and nontoxicity [9]. It is used in many application fields [10] such as in cement production [1,4,11,12], refractories elaboration [4,13], water purification [14], as an antibacterial material [7,15], biomaterial [16], in pharmaceuticals and cosmetics [7], in paints [17,18],…”

Section: Introductionmentioning

confidence: 99%

Synthesis of high purity magnesia MgO from Algerian dolomite ore

Bouchekrit

Elkolli

Altıner

et al. 2023

J min metall B Metall

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A nanometric Mg(OH)2 and MgO particles with high purity were successfully synthesized from Algerian dolomite via a leaching-precipitation-calcination process. The effect of leaching parameters such as H2SO4 acid concentration (C), temperature (T), time (t), solid/liquid ratio (S/L), and precipitation parameters: type of precipitating base (KOH, NaOH, NH4OH), OH-/Mg2+ ratio, and temperature on the obtained product properties were investigated using Taguchi approach. The optimal leaching conditions were selected as: C=5M, T=65?C, t=15 min, and S/L ratio=1:5. Whereas, the potassium hydroxide (KOH) was selected as the optimal precipitating base with OH-/Mg2+ = 10.5. The calcination of the precipitates at 800?C during 2 h made it possible to produce a high purity MgO (~99.45 %) with a crystallite size of approximately 16.5 nm and particles in the form of agglomerated porous plates with a high SSA (70.42 m2/g) which may be of interest for some applications such as catalysts or supports.

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Section: Introductionmentioning

confidence: 99%

Synthesis of high purity magnesia MgO from Algerian dolomite ore

Bouchekrit

Elkolli

Altıner

et al. 2023

J min metall B Metall

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“…High thermal conductivity is another significant advantage of MgO ceramic. It was reported that the thermal conductivity of MgO ceramic with 100% relative density was 38 W/(m K) 17 . However, the sintering temperatures of most MgO‐based ceramics were higher than 1000°C, making them unsuitable for the LTCC technology.…”

Section: Introductionmentioning

confidence: 99%

Low‐temperature‐sintered MgO‐based microwave dielectric ceramics with ultralow loss and high thermal conductivity

Zhao

Chen

et al. 2022

J Am Ceram Soc.

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With the development of 5G/6G communication, the requirements of portable devices for miniaturization and multifunction make low‐temperature co‐fired ceramic (LTCC) more and more important. In the area of high‐frequency high‐density passive integration, microwave dielectric ceramics with a low dielectric loss and high thermal conductivity are urgently needed to ensure the effective signals transmission and system reliability. However, most microwave dielectric ceramics with a low dielectric loss were not applicable for the LTCC technology due to the high sintering temperature. In this work, a series of MgO‐based ceramics [(100 − x) wt.% MgO–x wt.% (0.2SrF2–0.8LiF) (x = 5,7,10)] were prepared by solid‐state reaction method. The addition of sintering aid 0.2SrF2–0.8LiF (S2L8) decreased the sintering temperature below 880°C without degrading the microwave dielectric properties of ceramics. Microwave dielectric properties of ceramics, including quality factor Q × f, relative permittivity εr, and temperature coefficient of resonant frequency τf, were investigated to find the optimum composition and sintering temperature. In general, MgO–7 wt.% S2L8 ceramic sintered at 860°C exhibits outstanding properties of Q × f = 180 233 GHz, εr = 9.11, τf = −40.33 ppm/°C, and a high thermal conductivity of 24.02 W/(m K). This series of ceramics are suitable to be co‐fired with Ag electrodes. With all those great properties, this series of MgO‐based ceramics are expected to be the candidates for LTCC applications in 5G/6G technology.

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Recent advances in thermally conductive polymer composites

Huang

Hao

et al. 2022

High Performance Polymers

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Polymer matrix composites (PMCs) with high thermal conductivity (TC) play an important role in improving the heat dissipation capacity of a new generation of electronic devices, particularly for 5G and aviation applications. Over the last few decades, considerable efforts have been made in the fabrication of highly thermally conductive PMCs. Advances in the thermal conduction mechanism of polymer composites are induced to, and then commonly used thermally conductive fillers are presented. In the following, the factors affecting the TC of polymer composites are discussed in detail, including fillers, interfaces, polymer matrices and processing technologies. Special attention is paid to the thermally conductive fillers. Then, some application areas of thermally conductive polymer composites are introduced. Finally, the deficiencies and future development trends in this research field are put forward. It is expected that this review will provide some beneficial inspiration in improving the TC of PMCs.

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Morphological changes and their thermal conductivities of MgO crystals containing various impurities (B, Ca, Si)

Cited by 3 publications

References 13 publications

Synthesis of high purity magnesia MgO from Algerian dolomite ore

Synthesis of high purity magnesia MgO from Algerian dolomite ore

Low‐temperature‐sintered MgO‐based microwave dielectric ceramics with ultralow loss and high thermal conductivity

Recent advances in thermally conductive polymer composites

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