Sapphire Single-Crystal Waveguides and Fibers for Thz Frequency Range

The types and structures of oxide phases produced during the incongruent reduction of sapphire (single-crystal Al2O3) by molten magnesium were examined. Polished faces of sapphire were exposed to molten magnesium at 1000 °C for 100 h. Such exposure resulted in the formation of a continuous, epitaxial layer of spinel (MgAl2O4) on sapphire and a continuous, epitaxial layer of magnesia (MgO) on the spinel. X-ray pole figure analyses indicated that two variants of spinel and magnesia had formed in a manner consistent with the following orientation relationships:

Download Full-text

Pop-In Events and Elastic Deformation of Sapphire Single Crystal during Nanoindentation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.924.275 ◽

2014 ◽

Vol 924 ◽

pp. 275-280

Author(s):

Rui Ke ◽

Yu Min Zhang ◽

Yu Feng Zhou

Keyword(s):

Single Crystal ◽

Elastic Deformation ◽

Loading Rate ◽

Mechanical Test ◽

Maximum Load ◽

Rate Effects ◽

Sapphire Single Crystal

Sapphire single crystal is widely used in many fields because of its excellent properties, as a focus of mechanical test, nanoindentation on sapphire is paid a great deal of attention by researchers. In this manuscript, the maximum load, depth and loading rate effects on the first pop-in event during nanoindentation of sapphire single crystal were discussed, the results indicated that these factors had no effect on the load at which the first pop-in occurred and the extension width of pop-in; the deformation below the first pop-in event was discussed and it could be roughly considered as purely elastic deformation through analyzing.

Download Full-text

Vacuum evaporation of CdTe thin films on Ni, Mo, Ti and TiN-deposited sapphire single-crystal substrates

Current Applied Physics ◽

10.1016/j.cap.2010.02.040 ◽

2010 ◽

Vol 10 (3) ◽

pp. S499-S501 ◽

Cited By ~ 6

Author(s):

Yuichi Sato ◽

Hirotoshi Hatori ◽

Suguru Igarashi ◽

Manabu Arai ◽

Kazuki Ito ◽

...

Keyword(s):

Thin Films ◽

Single Crystal ◽

Vacuum Evaporation ◽

Sapphire Single Crystal ◽

Cdte Thin Films

Download Full-text

Thin Film Depositions of CdTe Semiconductors on Amorphous and Single Crystal Substrates and Comparisons of their Properties

Materials Science Forum ◽

10.4028/www.scientific.net/msf.638-642.2909 ◽

2010 ◽

Vol 638-642 ◽

pp. 2909-2914 ◽

Cited By ~ 2

Author(s):

Yuichi Sato ◽

Tatsushi Kodate ◽

Manabu Arai

Keyword(s):

Thin Film ◽

Thin Films ◽

Substrate Temperature ◽

Single Crystal ◽

Photoluminescence Properties ◽

Glass Substrates ◽

Indium Doping ◽

Sapphire Single Crystal ◽

Cdte Thin Films ◽

The Difference

Thin films of CdTe semiconductors were prepared on sapphire single crystal and quartz glass substrates by a vacuum evaporation method. Crystallinity and photoluminescence properties of the obtained CdTe thin films on the substrates were semi-quantitatively compared concerning the difference of the substrate materials. Dependences of the properties on the substrate temperature in the preparations and indium doping to the thin films were also investigated.

Download Full-text

Electrical Properties of Pb(Mg1/3Nb2/3)-PbTiO3 Ferroelectric Single Crystal

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.421-422.419 ◽

2009 ◽

Vol 421-422 ◽

pp. 419-422

Author(s):

Ghulam Shabbir ◽

Seiji Kojima

Keyword(s):

Phase Transition ◽

Electrical Properties ◽

Single Crystal ◽

Ferroelectric Phase Transition ◽

Ferroelectric Phase ◽

Charge Carriers ◽

Frequency Range ◽

Thermally Activated ◽

Phase Transition Temperatures ◽

Ferroelectric Single Crystal

The electrical properties of [001]-oriented morphotropic phase boundary (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-33%PT) single crystal have investigated as a function of temperature and frequency. The ac-conductivity exhibited continuous dispersion at all temperatures and frequency range examined and was associated to the thermally activated space charge carriers and local off-centering of Ti4+ and Pb2+ ions. The variations in ferroelectric phase transition temperatures observed in the poled state were associated to the polarization fluctuations and phase co-existence.

Download Full-text