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Electrical dc conductivity and laser damage threshold of pure and urea doped KH2PO4 crystals are investigated. It is found that the crystals with a low electrical conductivity have a high laser damage threshold. It is shown that increase of the resistivity and the laser damage threshold of the crystals realizes by the crystal growth from urea-containing aqueous solutions. The optimum molar value of...
Crystals of K3WO3F3 in low temperature ferroelectric modification, space group Cm, have been created by chemical synthesis. Crystal structure of this modification has been found by Reitveld method. Electronic parameters of the constituent element core levels have been measured with X-ray photoelectron spectroscopy. Chemical bonding in WO3F3 groups have been discussed.
Hexagonal gallium orthophosphate crystals have been obtained by spontaneous nucleation using the slow cooling method from X2Mo3O10 fluxes with X=Li, K. Infrared transmission measurements have revealed samples without significant hydroxyl groups and thermal analyses have pointed out the total reversibility state of the phase transition α-quartz GaPO4 harr β-cristobalite GaPO4. The first measurement...
Recently, lead free materials are being extensively investigated to replace the PZT ceramics. Potassium niobate (KNbO3) single crystals were successfylly grown by the TSSG technique. However, potassium niobate has problems of three phase transition temperatures (cubic to tetragonal, tetragonal to orthorhombic and orthorhombic-rhombohedoral), the orthorhombic structure at room temperature and complicated...
0.5 mm thick flux grown KTiOPO/sub 4/ has been poled with 800 nm domain period by employing electron-beam lithography and electric field poling. The structures can be used as an electrically amplitude adjustable Bragg reflector.
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