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000046092 0247_ $$2DOI$$a10.1016/j.jcrysgro.2005.03.038
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000046092 084__ $$2WoS$$aCrystallography
000046092 084__ $$2WoS$$aMaterials Science, Multidisciplinary
000046092 084__ $$2WoS$$aPhysics, Applied
000046092 1001_ $$0P:(DE-Juel1)130894$$aPithan, C.$$b0$$uFZJ
000046092 245__ $$aMicroemulsion mediated synthesis of nanocrystalline (Kx,Na1-x)NbO3 powders
000046092 260__ $$aAmsterdam [u.a.]$$bElsevier$$c2005
000046092 300__ $$a191 - 200
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000046092 440_0 $$03235$$aJournal of Crystal Growth$$v280$$x0022-0248
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000046092 520__ $$aThe present study reports on the synthesis of nanocrystalline (K-x,Na1-x)NbO3 powders prepared via microemulsion mediated hydrolytic decomposition of mixed alkoxide solutions. Compositions with different K/Na ratios ranging between the two end members KNbO3 and NaNbO3 have been synthesized and characterized with respect to stoichiometry, purity, crystalline structure, particle size and powder morphology using X-ray diffraction, Raman spectroscopy and inductively coupled plasma with optical emission spectroscopy. Both raw as well as calcined powders were investigated. For the technically relevant and piezoelectric most active composition (K-0.50,Na-0.50)NbO3 the results are presented and discussed in comparison to micron-sized and submicron-sized powders, that have been prepared by solid state reaction for reference. The study of the crystallographic structure of these reference powders by XRD and Raman spectroscopy confirms the size induced phase transition between the thermodynamically stable monoclinic modification for large particles towards a new triclinic polymorph, which has been reported for nano-powders of this composition by us previously. As possible origin for this phenomenon, internal OH- groups, variations in K-/Na-site occupancy and mechanical stresses arising from the large surface curvature of the nanocrystalline powders are addressed. (c) 2005 Elsevier B.V. All rights reserved.
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000046092 65320 $$2Author$$ananostructures
000046092 65320 $$2Author$$aniobates
000046092 65320 $$2Author$$apiezoelectric materials
000046092 7001_ $$0P:(DE-Juel1)VDB32996$$aShiratori, Y.$$b1$$uFZJ
000046092 7001_ $$0P:(DE-Juel1)129189$$aDornseiffer, J.$$b2$$uFZJ
000046092 7001_ $$0P:(DE-HGF)0$$aHaegel, F.-H.$$b3
000046092 7001_ $$0P:(DE-HGF)0$$aMagrez, A.$$b4
000046092 7001_ $$0P:(DE-Juel1)131022$$aWaser, R.$$b5$$uFZJ
000046092 773__ $$0PERI:(DE-600)1466514-1$$a10.1016/j.jcrysgro.2005.03.038$$gVol. 280, p. 191 - 200$$p191 - 200$$q280<191 - 200$$tJournal of crystal growth$$v280$$x0022-0248$$y2005
000046092 8567_ $$uhttp://dx.doi.org/10.1016/j.jcrysgro.2005.03.038
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