Preparation and properties of hard crystalline materials for optical applications — a review

Savage, J. A.

doi:10.1016/0022-0248(91)90107-g

Cited by 28 publications

(16 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(11)) with the measured E value (according to Eqs. (3) and (7)) shows that there is a difference of ∼2% (see Table VIII). Therefore, use of the longitudinal soundwave velocity alonewithout the density, shear velocity, or Poisson's ratio measurements-enables the evaluation of E for samples 111A, 123C, 123D, and 109A to within 2%.…”

Section: (4) Use Of Longitudinal Soundwave Velocity As a Predictor Ofmentioning

confidence: 83%

Elastic Moduli of Transparent Yttria

Yeheskel¹,

Tevet²

1999

Journal of the American Ceramic Society

109

View full text Add to dashboard Cite

The elastic moduli of yttria (Y 2 O 3 ) samples that were made from powders with various particle morphologies were studied by means of ultrasonic measurements. The soundwave velocities in the longitudinal and transverse modes were measured. The elastic moduli were calculated from the sound velocities and density. For the high-purity, highdensity (>5000 kg/m 3 ) Y 2 O 3 that was prepared in the present study, the average density and elastic moduli (and their standard deviations) were as follows: density () of 5020 ± 18 kg/m 3 , Young's modulus (E) of 179.8 ± 4.8 GPa, shear modulus (G) of 69.2 ± 2.0 GPa, bulk modulus (B) of 148.9 ± 3.0 GPa, and Poisson's ratio () of 0.299 ± 0.004. The average longitudinal and transverse soundwave velocities (V l and V t , respectively) were 6931 ± 65 and 3712 ± 49 m/s, respectively. The elastic moduli of lanthana-strengthened yttria (LSY) were ∼6% lower than those of high-purity Y 2 O 3 , and the value for LSY was ∼0.304. It has been argued that soundwave velocity is better than density, in regard to predicting the elastic moduli of fully dense and slightly porous materials. A linear equation that describes the change of the elastic moduli with soundwave velocity alone has been suggested. This equation was applicable to a relative elastic moduli range of 0.75-1.02.

show abstract

Section: (4) Use Of Longitudinal Soundwave Velocity As a Predictor Ofmentioning

confidence: 83%

Elastic Moduli of Transparent Yttria

Yeheskel¹,

Tevet²

1999

Journal of the American Ceramic Society

109

View full text Add to dashboard Cite

show abstract

“…However, it decreases obviously with increasing temperature and that the phenomenon is pronounced near the long wavelength cutoff as well as high temperature. It is well known that this behavior is caused by the increased lattice absorption and anharmonically induced broadening in the phonon density of states [12][13][14][15].…”

Section: Resultsmentioning

confidence: 97%

High‐temperature infrared and dielectric properties of large sapphire crystal for seeker dome application

Wang

Zhang²,

Han

et al. 2008

Cryst. Res. Technol.

View full text Add to dashboard Cite

In this paper, large-sized (Ø230 mm × 210 mm, 27.5 kg) sapphire was successfully grown by SAPMAC (sapphire growth technique with micro-pulling and shoulder-expanding at cooled center) method; and hemisphere dome (140 mm diameter, 5 mm thickness) was fabricated from as-grown boule. Also, its high temperature infrared transmission (2~7 µm, 20-800°C) and microwave dielectric properties (8-16.5 GHz, 30-1300°C) were investigated. The experimental results show that sapphire crystal exhibits high infrared transmittance (3 µm, 80-86 %), essentially negligible dielectric loss (4.9×10 ), but fairly high dielectric constants (ε=9.4-12.5) in the temperature range of 30-1300°C.

show abstract

“…Their excellent optical, mechanical, thermal and chemical characteristics make large sapphires the preferred dome material from which to make the outer windows of IR air-to-air missiles [1]. Large columnar sapphire crystals can be grown by various techniques.…”

Section: Introductionmentioning

confidence: 99%

Influence of the crucible geometry on the shape of the melt–crystal interface during growth of sapphire crystal using a heat exchanger method

Chen

2004

Journal of Crystal Growth

View full text Add to dashboard Cite

Preparation and properties of hard crystalline materials for optical applications — a review

Cited by 28 publications

References 41 publications

Elastic Moduli of Transparent Yttria

Elastic Moduli of Transparent Yttria

High‐temperature infrared and dielectric properties of large sapphire crystal for seeker dome application

Influence of the crucible geometry on the shape of the melt–crystal interface during growth of sapphire crystal using a heat exchanger method

Contact Info

Product

Resources

About