Transmittance and cathodoluminescence of AlN ceramics sintered with Ca3Al2O6 as sintering additive

Honma, Takayuki; Kuroki, Yoshio; Okamoto, Takuya; Takata, Masasuke; Kanechika, Yukihiro; Azuma, Masashi; Taniguchi, Hitofumi

doi:10.1016/j.ceramint.2007.09.062

Cited by 17 publications

(17 citation statements)

References 15 publications

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“…The observed data was consistent with the bandgap (6.2 eV = 200 nm) of AlN. Compared with the recent research about the transmittance of AlN, 17) overall transmittance was not so good.…”

Section: Methodssupporting

confidence: 78%

“…Unlike PL spectrum, intense emission band at 340 nm appeared and a sharp peak around 600 nm would be diffraction light of the main emission peak around 340 nm because no other work reported such a long wavelength emission. This intense UV emission was observed in the cathode luminescence spectrum 17) and the origin of this peak was still under discussion. 20)22) When compared with other famous scintillating materials evaluated in the same manner, scintillation of AlN was not so high due to a low X-ray absorption probability and a low emissivity.…”

Section: Resultsmentioning

confidence: 99%

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Dosimeter properties of AlN

Yanagida

Fujimoto

Kawaguchi³

et al. 2013

J. Ceram. Soc. Japan

188

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Optical, scintillation, and dosimeter properties of AlN ceramic were reported. AlN sample was SHAPAL, a commercial product of Tokuyama Corp. for mainly a heat sink application. From ultra violet to near infrared wavelengths, it showed 0.021% transmittance with visibly translucent appearance. In photoluminescence (PL), it exhibited mainly two emission bands around 340 and 550 nm with primary decay times of 0.92 and 0.24 ns, respectively. X-ray induced radioluminescence spectrum was investigated and 340 nm peak showed high emission intensity. As a dosimeter property, thermally stimulated luminescence (TSL) was studied and glow peaks appeared at 80 and 320°C. The linearity between the irradiated dose and TSL intensity was studied and AlN ceramic exhibited a good linear response from 0.002 to 0.1 Gy.

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“…The observed data was consistent with the bandgap (6.2 eV = 200 nm) of AlN. Compared with the recent research about the transmittance of AlN, 17) overall transmittance was not so good.…”

Section: Methodssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Dosimeter properties of AlN

Yanagida

Fujimoto

Kawaguchi³

et al. 2013

J. Ceram. Soc. Japan

188

View full text Add to dashboard Cite

show abstract

“…Honma et al . investigated the effect of the Ca 3 Al 2 O 6 (C 3 A) sintering additive on the transmittance of AlN ceramics . The transmission is significantly increased from 43% (no additive) to 77% (3 mass% C 3 A) at 800 nm, which is possible due to the reduction in the oxygen‐induced defect density by using C 3 A as the sintering additive.…”

Section: Transmittance Of (Oxy)nitride Ceramicsmentioning

confidence: 99%

Optical Properties of (Oxy)Nitride Materials: A Review

2013

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(Oxy)nitride materials, consisting mainly of transition metal and ionic‐covalent (oxy)nitrides, show a vast number of interesting physical and chemical properties due to their substantial structural diversity. The optical properties of these (oxy)nitrides, in combination with their excellent mechanical strength, thermal properties, and chemical stability, enable (oxy)nitrides to be used in a variety of industrial fields, such as photovoltaic, photothermal, photocatalytic, pigment, lighting and display, optoelectronic, and defense industries. The optical properties are extremely related to the electronic band structure of (oxy)nitrides, and can be varied significantly by changing the chemical composition (e.g., the oxygen to nitrogen ratio) and preparation/processing conditions. This article overviews the optical properties (including refractive index, reflectance, absorbance, band gap, photoluminescence, and transmittance) of (oxy)nitride materials that are in the form of thin films, powders, or bulk ceramics, and highlights their applications as antireflection coatings, solar spectral selectivity coatings, visible‐light‐driven photocatalysts, ecological pigments, phosphors for light‐emitting diodes, and transparent window materials.

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“…In most cases, however, it is difficult to attain full densification without sintering additives due to a property of high covalent bonding . In order to attain full densification and accordingly translucent AlN ceramics, the sintering with various additives has been studied …”

Section: Introductionmentioning

confidence: 99%

Fabrication of translucent AlN ceramics with MgF₂ additive by spark plasma sintering

et al. 2018

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Translucent AlN ceramics with 0‐2 wt.% MgF2 additive were prepared by spark plasma sintering. AlN powder was heated temporarily up to 2000°C, before holding at 1850°C for 20 minutes in N2 gas. The sintered ceramics consisted of a single phase of hexagonal AlN, and showed a transgranular fracture mode. The total transmittance was improved remarkably by the additive, to reach 74% at a wavelength of 800 nm for 1 wt.% MgF2. For 2 wt.% MgF2, the transmittance was slightly lower than that for 1 wt.% MgF2, and an absorption band was observed apparently at around 400 nm. The addition of MgF2 along with the temporary heating at higher temperatures than the sintering temperature contributed to improve the transmittance remarkably.

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Transmittance and cathodoluminescence of AlN ceramics sintered with Ca3Al2O6 as sintering additive

Cited by 17 publications

References 15 publications

Dosimeter properties of AlN

Dosimeter properties of AlN

Optical Properties of (Oxy)Nitride Materials: A Review

Fabrication of translucent AlN ceramics with MgF₂ additive by spark plasma sintering

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Transmittance and cathodoluminescence of AlN ceramics sintered with Ca3Al2O6 as sintering additive

Cited by 17 publications

References 15 publications

Dosimeter properties of AlN

Dosimeter properties of AlN

Optical Properties of (Oxy)Nitride Materials: A Review

Fabrication of translucent AlN ceramics with MgF2 additive by spark plasma sintering

Contact Info

Product

Resources

About

Fabrication of translucent AlN ceramics with MgF₂ additive by spark plasma sintering