{"title":"Birefringence study of the irreversible behavior of the incommensurate phase of quartz: effects of chemical impurities","authors":"F. Mogeon, G. Dolino","doi":"10.1051/JPHYS:0199000510170193900","DOIUrl":null,"url":null,"abstract":"A systematic study of the variations of the irreversible properties of the incommensurate phase of quartz has been performed by birefringence measurements in 9 samples (either synthetic or natural) of various compositions determined by chemical analysis and infrared spectroscopy. The shift of the α-β transition temperature for large impurity concentrations has been verified. The properties of the incommensurate phase are very sensitive to small changes of impurity contents: a global hysteresis going from 10 to 220 mK has been correlated to the OH infrared absorption. Time dependent pinning steps and memory effects have been observed showing the importance of mobile impurities. Finally a regime of discontinuous variation of physical properties appears for slow rate of temperature variations. Thes Une etude systematique des proprietes irreversibles de la phase incommensurable du quartz a ete faite par des mesures de birefringence sur 9 echantillons (synthetiques ou naturels) de differentes compositions, determinees par analyse chimique et spectroscopie infrarouge. Les decalages de la temperature de la transition α-β, produits par des concentrations importantes d'impuretes ont ete mesures. Les proprietes de la phase incommensurable sont tres sensibles a la presence de faibles taux d'impuretes: des hysteresis globales variant de 10 a 220 mK, ont ete mesurees et une correlation avec l'absorption infrarouge due aux liaisons OH a ete trouvee. Des effets dependant du temps tels que des marches d'accrochages et des effets memoires ont ete observes, montrant l'importance des defauts mobiles. Enfin, un regime de variations discontinues des proprietes physiques apparait pour les petites vitesses de variation de la temperature. Les resultats de ces experiences ont ete compares a diverses predictions theoriques, telles que celles de la theorie des Ondes de Densite des Defauts dues a la diffusion des impuretes mobiles","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"34 1","pages":"1939-1960"},"PeriodicalIF":0.0000,"publicationDate":"1990-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"8","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal De Physique","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1051/JPHYS:0199000510170193900","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 8
Abstract
A systematic study of the variations of the irreversible properties of the incommensurate phase of quartz has been performed by birefringence measurements in 9 samples (either synthetic or natural) of various compositions determined by chemical analysis and infrared spectroscopy. The shift of the α-β transition temperature for large impurity concentrations has been verified. The properties of the incommensurate phase are very sensitive to small changes of impurity contents: a global hysteresis going from 10 to 220 mK has been correlated to the OH infrared absorption. Time dependent pinning steps and memory effects have been observed showing the importance of mobile impurities. Finally a regime of discontinuous variation of physical properties appears for slow rate of temperature variations. Thes Une etude systematique des proprietes irreversibles de la phase incommensurable du quartz a ete faite par des mesures de birefringence sur 9 echantillons (synthetiques ou naturels) de differentes compositions, determinees par analyse chimique et spectroscopie infrarouge. Les decalages de la temperature de la transition α-β, produits par des concentrations importantes d'impuretes ont ete mesures. Les proprietes de la phase incommensurable sont tres sensibles a la presence de faibles taux d'impuretes: des hysteresis globales variant de 10 a 220 mK, ont ete mesurees et une correlation avec l'absorption infrarouge due aux liaisons OH a ete trouvee. Des effets dependant du temps tels que des marches d'accrochages et des effets memoires ont ete observes, montrant l'importance des defauts mobiles. Enfin, un regime de variations discontinues des proprietes physiques apparait pour les petites vitesses de variation de la temperature. Les resultats de ces experiences ont ete compares a diverses predictions theoriques, telles que celles de la theorie des Ondes de Densite des Defauts dues a la diffusion des impuretes mobiles
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