天然無色綠柱石晶體電注入著色及光譜特性.pdf

1、天津大學(xué)碩士學(xué)位論文天然無色綠柱石晶體電注入著色及光譜特性姓名：陳偉偉申請學(xué)位級別：碩士專業(yè)：材料物理與化學(xué)指導(dǎo)教師：顧洪恩20090501ABSTRACTNaturalcolorlessBerylcrystalswerecoloredforthefirsttimeatvarioustemperaturesandvoltagesbyusingelectrolysismethodThecoloredcrystalsexhibitgolde

2、nyellowcolorThecolorofthecoloredberylsisstableatroomtemperatureorunderilluminationofdaylightAbsorptionandreflectionspectraofthecoloredberylcrystalsweremeasuredandanalyzedsystematicallyMechanismofformationandtransformatio

3、nofimpurityionsandcolorcentersisgivenBymeansofcurrenttimecurve，theformationortransformationmechanismofimpurityionsandcolorcentersisexplainedfurtherAbsorptionbandsoftransitionmetalironimpurityionswereobservedintheabsorpti

4、onspectraofnaturalcolorlessberylcrystalbeforeelectrolyticcolorationConcentrationoftheironimpurityionsinthecrystalisestimatedaccordingtOthevaluesofthespectralparametersoftheabsorptionbandandtheSmakulasformulaInthevisiblel

5、ightregion，thereflectionspectrumofthecrystalbeforeelectrolyticcolorationissmootherThereisonlyaweaknarrowspectralbandinthespectrumTherefore，crystalremainscolorlessandtransparentAttheambienceofappropriatetemperaturesandvol

6、tages，thenaturalcolorlessberylcrystalswerecoloredelectrolyticallybyusingapointedcathodeInappropriatetimeoftheelectrolysismoreimpurityFe3ionsinthesitesoftheoctahedralA13十a(chǎn)reformedattheberylcrystalssurfacelayerItmainlyisth

7、esechromophorestomakethecoloredberylcrystaltoexhibitthegoldenyellowcolorInthemeantime，someotherimpurityionsandcolorcentersincludingthefamousMaxixetypecolorcentersareformedBymeansofreflectionspectraofthecoloredcrystal，the

8、formationofthegoldenyellowcolorwiththemetalliclusteroftheberylcrystalswereexplainedfhrtherAttheambienceofappropriatetemperaturesandvoltages，thenaturalcolorlessberylcrystalswerecoloredelectrolyticailybyusingapointedanodeI

9、nappropriatetimeoftheelectrolysismoreimpudtyFe3ionsinthesitesoftheoctahedralA13areformedattheberylcrystalssurfacelayerItisthesechromophorestomakethecoloredberylcrystaltoexhibitthegoldenyellowcolorInthemeantime，someotheri