Relevant bibliographies by topics / Strontium

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Academic literature on the topic 'Strontium'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 July 2024

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Journal articles on the topic "Strontium"

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Tomczyk-Warunek, Agnieszka, Karolina Turżańska, Agnieszka Posturzyńska, Filip Kowal, Tomasz Blicharski, Inés Torné Pano, Anna Winiarska-Mieczan, et al. "Influence of Various Strontium Formulations (Ranelate, Citrate, and Chloride) on Bone Mineral Density, Morphology, and Microarchitecture: A Comparative Study in an Ovariectomized Female Mouse Model of Osteoporosis." International Journal of Molecular Sciences 25, no. 7 (April 6, 2024): 4075. http://dx.doi.org/10.3390/ijms25074075.

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Osteoporosis stands out as a prevalent skeletal ailment, prompting exploration into potential treatments, including dietary strontium ion supplements. This study assessed the efficacy of supplementation of three strontium forms—strontium citrate (SrC), strontium ranelate (SrR), and strontium chloride (SrCl)—for enhancing bone structure in 50 female SWISS mice, aged seven weeks. In total, 40 mice underwent ovariectomy, while 10 underwent sham ovariectomy. Ovariectomized (OVX) mice were randomly assigned to the following groups: OVX (no supplementation), OVX + SrR, OVX + SrC, and OVX + SrCl, at concentrations equivalent to the molar amount of strontium. After 16 weeks, micro-CT examined trabeculae and cortical bones, and whole-bone strontium content was determined. Results confirm strontium administration increased bone tissue mineral density (TMD) and Sr content, with SrC exhibiting the weakest effect. Femur morphometry showed limited Sr impact, especially in the OVX + SrC group. This research highlights strontium’s potential in bone health, emphasizing variations in efficacy among its forms.
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Murray, T. "Elementary Scots the Discovery of Strontium." Scottish Medical Journal 38, no. 6 (December 1993): 188–89. http://dx.doi.org/10.1177/003693309303800611.

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The element Strontium takes its name from the village of Strontian in Argyll. It was in ore samples taken from lead mines near the village that Strontium was first identified as a new element in 1790. A radioactive form of the element has reached medical prominence through its use in the palliation of pain in patients with painful skeletal metastases.
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Christgau, Stephan, Jette Odderhede, Kenny Stahl, and Jens E. T. Andersen. "StrontiumD-glutamate hexahydrate and strontium di(hydrogenL-glutamate) pentahydrate." Acta Crystallographica Section C Crystal Structure Communications 61, no. 6 (May 13, 2005): m259—m262. http://dx.doi.org/10.1107/s0108270105011820.

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MAKHIJANI, ARJUN. "STRONTIUM." Chemical & Engineering News 81, no. 36 (September 8, 2003): 100. http://dx.doi.org/10.1021/cen-v081n036.p100.

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Stahl, Kenny, Jens E. T. Andersen, and Stephan Christgau. "Strontium diibuprofenate dihydrate, strontium malonate sesquihydrate, strontium diascorbate dihydrate and strontium 2-oxidobenzoate hydrate at 120 K." Acta Crystallographica Section C Crystal Structure Communications 62, no. 4 (March 18, 2006): m144—m149. http://dx.doi.org/10.1107/s0108270106005464.

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Li, Duo, Shuang Gan, Junfeng Li, Zihan Dong, Qi Long, Shuwei Qiu, Yahong Zhou, and Changyu Lu. "Hydrochemical Characteristics and Formation Mechanism of Strontium-Rich Groundwater in Shijiazhuang, North China Plain." Journal of Chemistry 2021 (March 24, 2021): 1–10. http://dx.doi.org/10.1155/2021/5547924.

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Strontium is a kind of trace element. Groundwater containing strontium is called mineral water when its content reaches a level that is beneficial for human physiology. Some groundwater resources in Shijiazhuang are rich in strontium. In this study, groundwater samples collected from 103 sites were studied for the hydrochemical characteristics of strontium and its formation mechanism in the groundwater system in Shijiazhuang City. The methods of source provenance analysis, factor correlation analysis, and runoff condition analysis were carried out in the study. The results showed that the content of strontium in eastern Shijiazhuang is higher than 0.229 mg/L, with a maximum content of 1.942 mg/L. The source of strontium is the dissolution of strontium-containing minerals in carbonate rock, sheet hemp rock, clastic rock, and granite in the Taihang Mountain area of the Hutuo River Basin. Strontium is positively correlated with total dissolved solids, bicarbonate, calcium magnesium, and free carbon dioxide. The erosion ability of groundwater strengthens the dissolution of strontium, and the geochemical action is mainly due to the dissolution. The enrichment and distribution of strontium are related to the conditions of groundwater runoff. Areas with good runoff conditions and strong mining are low in strontium, while areas with poor runoff conditions have high strontium content.
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Goblet, C., and Y. Mounier. "Activation of skinned muscle fibers by calcium and strontium ions." Canadian Journal of Physiology and Pharmacology 65, no. 4 (April 1, 1987): 642–47. http://dx.doi.org/10.1139/y87-107.

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Intact and mechanically skinned skeletal muscle fibers of the crab Carcinus maenas have been used. The aim of the experiments was to determine the origin of the mechanical activity recorded in intact crab muscle fibers exhibiting an inward strontium current in strontium solution without calcium. To do so, the effect of strontium ions in inducing activation of contractile proteins and calcium release from the sarcoplasmic reticulum has been studied. The properties of the sarcoplasmic reticulum membrane towards strontium ions, i.e., the efficiency of the calcium ATPase towards strontium ions and the capability to release strontium ions have been investigated. Results show that the contractile proteins have a lower affinity for strontium than for calcium ions. However, the maximum bound strontium is identical to the maximum bound calcium. As for the sarcoplasmic reticulum, strontium ions can induce a calcium release and also can be taken up by the calcium ATPase and be released. We concluded that the mechanical activity in intact fibers bathed in a strontium medium has two origins: first, a direct and partial activation of the contractile proteins by strontium ions flowing through the calcium channel; second, a contractile proteins activation of calcium ions released by the sarcoplasmic reticulum by a "strontium-induced calcium release" mechanism.
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Liu, Chenglun, Longjun Xu, Xueyan Yang, Tiefeng Peng, and Jianjun Ren. "Preparation of strontium ferrite from strontium residue." Chinese Journal of Geochemistry 31, no. 1 (January 5, 2012): 74–77. http://dx.doi.org/10.1007/s11631-012-0551-9.

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Li, Gui Qiang, Shou De Wang, Chao Nan Yin, and Ling Chao Lu. "Influence of Strontium Doping on Sintering and Performance of Alite-Rich Cement Clinker." Advanced Materials Research 168-170 (December 2010): 482–87. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.482.

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The synthesis conditions and mechanical performance of alite-rich cement clinker were investigated by the orthogonal test method. Sintering temperature, sintering time and contents of strontium oxide or strontium sulfate were taken as the influencing factors for the orthogonal test. The experimental results show that the optimal sintering temperature and sintering time are 1450 °C and 60 min, and the best strontium oxide or strontium sulfate content in the clinker is 1.5% and 0.5%, respectively. The doping of strontium oxide or strontium sulfate can promote the formation of alite mineral. That is beneficial to the increase of cement strength. The early strength of cement can be improved by addition of strontium oxide, and the long strength of cement can be increased through adding a little of strontium sulfate.
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Turżańska, Karolina, Agnieszka Tomczyk-Warunek, Maciej Dobrzyński, Maciej Jarzębski, Rafał Patryn, Joanna Niezbecka-Zając, Monika Wojciechowska, Aneta Mela, and Aneta Zarębska-Mróz. "Strontium Ranelate and Strontium Chloride Supplementation Influence on Bone Microarchitecture and Bone Turnover Markers—A Preliminary Study." Nutrients 16, no. 1 (December 27, 2023): 91. http://dx.doi.org/10.3390/nu16010091.

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Despite strontium ranelate use in osteoporosis management being one of the promising concepts in disease treatment, there is no clear evidence that strontium organic compounds are more effective than inorganic ones. The aim of this study was to compare strontium chlorate and strontium ranelate influence on the mice bone microarchitecture. We investigated whether strontium chlorate (7.532 mmol/L) and strontium ranelate (7.78 mmol/L) solutions fed to healthy SWISS growing mice (n = 42) had an influence on the percent of bone volume (BV/TV), trabecular thickness (Tb.Th), number of trabeculae (Tb.N), and separation between each trabecula (Tb.Sp) in the chosen ROI (region of interest) in the distal metaphysis of the left femurs. The cortical bone surface was examined close to the ROI proximal scan. There was an increase in each examined parameter compared with the control group. There were no statistical differences between strontium ranelate and strontium chlorate parameters. Our study indicates that organic and inorganic strontium compounds similarly affect the bone microarchitecture and strength.
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Dissertations / Theses on the topic "Strontium"

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Lehnen, Peer. "Relaxoreigenschaften von Strontium-Barium-Niobat - Relaxor Properties of Strontium-Barium-Niobate." Gerhard-Mercator-Universitaet Duisburg, 2001. http://www.ub.uni-duisburg.de/ETD-db/theses/available/duett-12132001-102821/.

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In the present thesis the relaxor properties of the tungsten-bronze ferroelectric material strontium-barium niobate Sr1-wBawNb2O6 (SBN) are investigated. SBN is a very good experimental realization of the three-dimensional random-field Ising model (3d RFIM). The quenched random fields (RF) originate from charge disorder and can be enhanced by doping with Ce3+. They are responsible for the formation of polar nanoclusters in the paraelectric phase. In order to study the critical behavior of SBN, linear birefringence (LB) and second harmonic generation (SHG) have been measured as a function of temperature. Within an Ornstein-Zernike analysis of the LB data the autocorrelation function, <P2>, was determined, whereas the dipolar correlation length was obtained from the SHG data. They suggest that, due to its intrinsic disorder, pure SBN does not belong to the 3d Ising universality class. Doping with Ce3+ions, which seem to generate RFs, enhances the relaxor properties. The critical exponents v and y of SBN:Ce shift against those of the 3d RFIM. The domain morphology of SBN:Ce has been investigated by piezoelectric force microscopy (PFM). Fractal-like shaped zero-field cooled nanodomains are observed. Their size distribution can be described by a power law with exponential cutoff in accordance with prediction for the RFIM. It was measured for the first time in a RF system. The temperature and field induced evolution of natural and written domains has been studied with PFM, LB and SHG measurements. It reveals a very slow relaxation from a macrodomain into a depolarized multidomain state (and vice versa) even above TC. This hints at strong pinning forces due to quenched RFs. They are also responsible for the observed aging in poled SBN and the field induced cluster percolation above TC measured with SH-hysteresis. The domains can be considered as a "thick" phase grating for SH-diffraction. The Bragg-regime diffraction efficiency reflects the temperature and field induced change of the averaged domain sizes in the system.
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McNicholas, Kyle M. "Characterization of Native Point Defects in Barium Strontium Titanate / Strontium Titanate Heterostructures." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337970955.

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Marshall, Matthew Spiro James. "Nanostructured strontium titanate surfaces." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509992.

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Jia, Jingyi. "Strontium -90 Radiation Detection." Thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-23308.

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The objective of this thesis is to construct a measurement system, measuring Radiation from Strontium with mass number 90 ( 90 Sr). The absorbed beta particle has a kinetic energy of 546 keV. The constructed scanning system makes it possible to sweep over a larger area than the actual Silicon detector. The used detector has an area of 1cm 2 . [1] A Si detector is connected to an electronic read out circuit. The Arduino microcontroller reads the output of the circuit and translates it to digital signals and sends them to a personal computer. After one signal has been read, Arduino will discharge the peak detector in the circuit to read another signal. The Arduino control software Processing will receive and process the digital output from Arduino. There will be three windows showing the number of counts from Arduino, the movement of the steering engine controlled by Thorlabs, and the sum counts of every position where the detector is.
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Singer, David Marc. "Uranium and strontium (bio)geochemistry : limits on uranium and strontium mobility in the environment /." May be available electronically:, 2008. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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Langlais, Joseph. "Strontium extraction by aluminothermic reduction." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22447.

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The Melt-Leach-Evaporation (MLE) process is under development for the extraction of valuable Group IA or IIA metals of the Periodic Table, such as lithium, calcium, magnesium and strontium. The process consists of mixing and contacting the value metal source material, which might be an ore or concentrate, with an excess of molten metal which is acting as a reductant and lixiviant. In the process, the value metal extracted from the source material is dissolved in the excess molten metallic solvent and is subsequently extracted as a vapour by vacuum distillation. The vapour is condensed and recuperated in the metallic state.
An experimental program involving eight experiments was carried out. The experimental procedure consisted in essence of melting the aluminum reductant in a crucible and adding the source material, SrCO$ sb3,$ and other reactant (Mg or Bi). (Abstract shortened by UMI.)
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Millen, James. "A cold strontium Rydberg gas." Thesis, Durham University, 2011. http://etheses.dur.ac.uk/849/.

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Cold gases of Rydberg atoms are an ideal system in which to study the novel effects of strong interatomic interactions. This thesis describes the design and construction of the world's first experiment to study Rydberg states in a cold gas of an alkaline earth metal, in this particular case strontium. We have studied a wide range of Rydberg states, and have developed a sensitive ``step-scan" spectroscopic technique that detects the spontaneous ionization of the Rydberg gas. The step-scan method is used to acquire Stark maps, and these measurements verify a single-electron model for calculating dipole matrix-elements. From the matrix-elements, interaction strengths between strontium Rydberg atoms have been calculated for the first time. The presence of two valence electrons in an alkaline earth metal, such as strontium, offers a new angle on the study of Rydberg atoms. We create doubly excited ``autoionizing" states, the first such study in a cold gas. Autoionization is used as a high yield probe of Rydberg states, and enables a study of excitation dynamics with nanosecond time-resolution. We show that autoionization can quantitatively identify and elucidate state mixing in the Rydberg gas, and probe population transfer at the very onset of ultra-cold plasma formation.
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Scaffidi, Thomas. "Unconventional superconductivity in strontium ruthenate." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:af08bf3f-3934-48f1-89af-a897948172fb.

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In this thesis, a weak coupling formalism is developed to study superconductivity in spin-orbit coupled, multi-orbital systems. This formalism is then applied to Sr2RuO4, one of the few candidates for odd-parity superconductivity. We show that spin-orbit coupling and multi-band effects are crucial to understand the physics of this material. Depending on the interaction parameters, the order parameter can either be chiral or helical. In both cases, the gap is highly anisotropic, and has accidental deep minima along certain directions, in accordance with experiments. Focusing then on the chiral case, we show that the total Chern number is -7 instead of the usually assumed +1. This leads to drastically different predictions for the thermal and charge Hall conductances. In particular, we show that the absence of measurable charge edge currents is not incompatible with a chiral state. Finally, we study the evolution of superconductivity in Sr2RuO4 under ?100? uniaxial strain. We find a good agreement with experiments for our prediction of Tc as a function of strain. Furthermore, we find that (1) the absence of a measurable cusp of Tc at zero strain is not incompatible with a chiral state and that (2) there could be a transition to an even-parity state at larger strain close to a Van Hove singularity. We propose Hc,2/Tc2 c as a measurable quantity to identify this transition.
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Fuentes, López-Doriga Víctor. "Resistive Switching in Strontium Iridates." Doctoral thesis, Universitat Autònoma de Barcelona, 2021. http://hdl.handle.net/10803/671961.

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Aquesta Tesi estudia les propietats de Commutació Resistiva en capes primes de la sèrie de Ruddlensen-Popper de Iridats d’Estronci (Srn+1IrnO3n+1), posant el focus en els efectes de les transicions metall-aïllant d’aquestes fases en les característiques de la commutació resistiva. Amb l’objectiu d’assolir aquest propòsit, la deposició d’iridats mitjançant polvorització catòdica es estudiada. En el transcurs de la investigació, es va trobar que la polvorització catòdica, a diferència de la deposició per polsos de làser, presenta un creixement preferencial per al membre perovskita de la família (SrIrO3 amb desviacions de la estequiometria nominal. Aquest creixement esta controlat principalment per processos cinètics i posseeix un gran efecte de reemissió observat a altes temperatures. Una caracterització microestructural completa ens mostra que les capes obtingudes són planes, estables, homogènies i posseeixen un alt nivell de cristal·linitat. A més a més, les condicions de deposició d’aquestes capes van ser alterades per ajustar la morfologia de les capes des de topografies planes a nanoestructures amb forats, els quals poden ser ordenats d’acord amb el substrat. Amb l’objectiu de tenir un punt de comparació, capes de Sr2IrO4 han estat crescudes mitjançant deposició per polsos de làser. Després d’obtenir capes d’alta qualitat de les fases SrIrO3 i Sr2IrO4, les seves propietats elèctriques son avaluades. Per una banda, les capes de Sr2IrO4 van presentar un comportament aïllant, el qual reflecteix la seva naturalesa d’aïllant de Mott, per l’altre, el de les capes gruixudes de SrIrO3 van mostrar un estat base semimetàl·lic. Reduint el gruix en aquestes últimes una transició Metall-Aïllant pot ser desencadenada a baixes temperatures. Aquest règim, el qual exhibeix magnetoresistència negativa a baixes temperatures, està en consonància amb el mecanisme de localització dèbil en 2D, indicant el desordre com l’origen de la transició. Una reducció a gruixos més baixos porta el sistema a un canvi abrupte cap a un comportament totalment aïllant acompanyat per un increment significatiu de la magnetoresistència negativa i un desplaçament lleu en el balanç de portadors, el qual es mesurat per efecte Hall. Aquest comportament pot ser atribuït a una localització forta de Anderson. Les capes nanoestructurades també van presentar la mateixa transició però amb una evolució més suau de les propietats. Les mesures elèctriques locals realitzades amb Microscòpia de Força Atòmica de Corrent i Microscòpia de Sonda Kelvin van provar que ambdues fases posseeixen propietats robustes de commutació resistiva. Malgrat això, el estat base electrònic de cada capa té un impacte en les característiques de la commutació. Mentre que les capes semimetàl·liques de SrIrO3 van mostrar una transició suau entre estats de resistència, les capes ultraprimes aïllants van presentar un clar voltatge llindar a 2 V. Aquesta commutació més abrupta és replicada també per les capes aïllants de Sr2IrO4, que exhibeixen un llindar a 4,5 V. Un model de mecanisme basat en l’addició o subtracció de vacants d’oxigen en la interfície de les capes es proposat per explicar els resultats observats. Els canvis en el estat de resistència són atribuïts a desplaçaments en el nivell de Fermi dels materials. Per una banda, la continuïtat de estats electrònics en les capes semimetàl·liques causa una commutació suau. Per l’altre, la presencia de estats localitzats de Anderson o una separació energètica de Mott crea una barrera energètica que força el sistema a una commutació mes abrupta modelada per el voltatge llindar.
Esta Tesis estudia las propiedades de conmutación resistiva en capas delgadas de la serie de Ruddlensen-Popper de Iridatos de Estroncio (Srn+1IrnO3n+1), poniendo el foco en los efectos de las transiciones metal-aislante de estas fases en las características de la conmutación resistiva. Con el objetivo de alcanzar este propósito, la deposición de iridatos mediante la pulverización catódica es estudiada. En el transcurso de la investigación se encontró que la pulverización catódica, a diferencia de la deposición por pulsos de láser, presenta un crecimiento preferencial para el miembro perovskita de la familia con desviaciones en la estequiometría nominal. Este crecimiento está controlado principalmente por procesos cinéticos i posee un gran efecto de reemisión observado a altas temperaturas. Una caracterización microstructural completa nos muestra que las capas obtenidas son planas, estables, homogéneas y poseen un alto nivel de cristalinidad. Además, las condiciones de deposición de estas capas fueron alteradas para ajustar la morfología de las capas des de topografías planas a nanoestructuras con agujeros, los cuales pueden ser ordenados de acuerdo con el sustrato. Con el objetivo de tener un punto de comparación, capas de Sr2IrO4 han sido crecidas mediante deposición por pulsos de láser. Una vez obtenidas capas de alta calidad de las fases SrIrO3 y Sr2IrO4, sus propiedades eléctricas son evaluadas. Por una parte, las capas de Sr2IrO4 presentaron un comportamiento aislante, el cual refleja su naturaleza de aislante de Mott, por otra parte, las capas gruesas de SrIrO3 mostraron un estado base semimetálico. Reduciendo el grosor de estas últimas una transición Metal-Aislante puede ser desencadenada a bajas temperaturas. Este régimen, el cual exhibe magnetoresistencia negativa a bajas temperaturas, está en consonancia con el mecanismo de localización débil en 2D, indicando el desorden como el origen de la transición. Una reducción a grosores más bajos lleva el sistema a un cambio abrupto hacia un comportamiento totalmente aislante acompañado por un incremento significativo de la magnetoresistencia negativa i un desplazamiento leve en el balance de los portadores, el cual fue medido por efecto Hall. Este comportamiento puede ser atribuido a una localización fuerte de Anderson. Las capas nanoestructuradas también presentaron la misma transición pero con una evolución más suave de sus propiedades. Las medidas eléctricas locales realizadas con Microscopía de fuerza Atómica de corriente y la microscopía de sonda Kelvin probaron que ambas fases poseen propiedades robustas de conmutación resistiva. Sin embargo, el estado base electrónico de cada capa tiene un impacto en las características de la conmutación. Mientras que las capas semimetálicas de SrIrO3 mostraron una transiciónsuave entre los estados de resistencia, las capa ultradelgadas aislantes presentaron un voltaje umbral a 2 V. esta conmutación más abrupta es replicada también por las capas aislantes de Sr2IrO4, que exhibieron un lindar a 4,5 V. Un modelo de mecanismo basado en la adición y substracción de vacantes de oxígeno en la superficie de las capas es propuesto para explicar los resultados obtenidos. Los cambios de estado de resistencia son atribuidos a desplazamientos en el nivel de Fermi de los materiales. Por una parte, la continuidad de estados electrónicos en capas semimetálicas causa una conmutación suave. Por otra parte, la presencia de estados localizados de Anderson o una separación energética de Mott crea una barrera energética que fuerza al sistema a una conmutación más abrupta modelada por el voltaje umbral.
The present thesis studies the Resistive Switching properties in Ruddlensen-Popper strontium iridates (Srn+1IrnO3n+1) thin films, focusing on the effect of Metal-Insulator Transitions of these phases in the Resistive Switching features. In order to achieve this purpose, the deposition of iridates by sputtering is studied. During the course of the research it was found that the sputtering technique, unlike the more studied PLD, presents a preferential growth for the perovskite member of the family (SrIrO3) with deviations from the nominal stoichiometry. This growth is mainly controlled by kinetic processes with a large resputtering effect observed at high temperatures. A complete microstructural characterization has shown that the obtained films are flat, stable, homogeneous and possess a high level of crystallinity. Additionally, the conditions of deposition in these films were altered to tune the morphology of the film from flat to a nanostructured topography with holes that can be ordered according to the underlying substrate. For the sake of comparison, Sr2IrO4 films were grown by PLD. After obtaining high quality films of the SrIrO3 and Sr2IrO4 phases, their electrical properties are evaluated. While Sr2IrO4 films presented an insulating behavior, which reflects their Mott insulator nature, the thick perovskite SrIrO3 films showed a semimetallic ground state. As the thickness of the SrIrO3 film is reduced a Metal-Insulator Transition is triggered at low temperature. This regime, exhibiting negative magnetoresistance at low temperature, is in well agreement with the Weak localization mechanism in 2D indicating the disorder as the origin of the transition. Further lowering the thickness leads to an abrupt change of behavior to a fully insulating film that is accompanied by a significant increase of the negative magnetoresistance and a slight change in the balance between carriers as measured by Hall Effect. This behavior may be attributed to strong Anderson-like localization. The nanostructured films also presented the same transition but with a softer evolution of the properties. Local electric measurements performed with Conductive Atomic Force Microscopy and Kelvin Probe Force Microscopy proved that both studied phases possess robust bipolar Resistive Switching. Nevertheless, the electronic ground state of each film has a significant impact on the characteristics of this switching. While the thick semimetallic SrIrO3 films showed a smooth transition between resistance states, the insulating thinnest films presented a clear threshold at 2 V. This more abrupt switching is also replicated by the insulating Sr2IrO4 film, which exhibited a 4.5 V threshold. A mechanism model based in the addition or subtraction of oxygen vacancies in the interface of the films is proposed to explain the observed results. The changes in the resistance state are attributed to shifts in the Fermi level of the materials. On one hand, the continuum of electronic states in the semimetallic films causes a soft switching. On the other hand, the presence of Anderson localized states or a Mott band gap create an energy barrier that forces the system into a more abrupt switching shaped by a threshold.
Universitat Autònoma de Barcelona. Programa de Doctorat en Ciència de Materials
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Branfield, Thomas. "Aspects of strontium titanate nanomaterials." Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.682183.

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Strontium titanate (SrTi03) is a perovskite material with diverse physical properties. Many of its properties are associated with its atomic structure, such as quantum paraelectricity, structural phase transitions, and extrinsically induced ferroelectricity. Accordingly, many structural investigations have been performed on bulk and thin film samples of SrTi03 . At the same time, many syntheses of SrTi03 nanoparticles and nanowires have been reported. Despite these factors, however, the structure and properties of SrTi03 nanoparticles and nanowires are not well understood. The aim of this thesis is to better understand such SrTi03 nanoparticles and nanomaterials using a combination of theoretical and experimental methods. Density-functional calculations were performed of bulk SrTi03 and (100) SrTi03 surfaces, with a focus towards nanomaterials applications. The outer layers of both SrO and Ti02 terminated (100) surfaces relaxed inward, and the subsequent layers alternately moved outwards and inwards. Furthermore, surface rumpling was observed. Both the interlayer distances and rumpling were determined as a function of depth. Tests of different exchange-correlation functionals were performed throughout. Next, the first-ever density-functional calculations were performed of the structural and electronic properties of SrTi03 nanowires. No ferroelectric states were found for the nanowires, despite active searching. Compressive axial and lateral strain was observed for all the nanowires, and the extent of this strain varied with diameter and surface termination. Furthermore, surface rumpling was found to occur on and within the nanowires; subsequent plots of the local polarization revealed that every nanowire possessed a radial polarization texture. Finally, electronic band structure calculations revealed that all the SrTi03 nanowires were metallic. Finally, experimental studies were performed on SrTi03 nanoparticles, with the longterm aim of determining and understanding their local atomic structure. Transmission electron microscopy showed that the nanoparticles were polydisperse, and powder x-ray diffraction measurements showed that they were composed of mostly SrTi03.
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Books on the topic "Strontium"

1

Paul, Howe, World Health Organization, Inter-Organization Programme for the Sound Management of Chemicals, and International Labour Organisation, eds. Strontium and strontium compounds. Geneva: World Health Organization, 2010.

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United States. Agency for Toxic Substances and Disease Registry. Division of Toxicology. Strontium. Atlanta, GA: Division of Toxicology, Dept. of Health and Human Services, Public Health Service, Agency for Toxic Substances Disease Registry, 2004.

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Ober, Joyce A. Strontium--uses, supply, and technology. Washington, DC: U.S. Dept. of the Interior, Bureau of Mines, 1989.

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Ferrell, John E. Strontium: A chapter from Mineral facts and problems, 1985 edition. [Washington, D.C.?]: U.S. Dept. of the Interior, Bureau of Mines, 1985.

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Measurements, National Council on Radiation Protection and. Some aspects of strontium radiobiology. Bethesda, MD: The Council, 1991.

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Pathak, Pankaj, and Dharmendra K. Gupta, eds. Strontium Contamination in the Environment. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-15314-4.

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Independent Review Group on Retention of Organs at Post-Mortem. Report on strontium-90 research. [Edinburgh: Stationery Office], 2002.

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Basabe, Jacqueline. Gel-processing of strontium ferrite. Manchester: University of Manchester, 1993.

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Leung, Kon H. The Strontium Molecular Lattice Clock. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-47647-1.

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Monz, Ludwin. Eine neue, optische Methode zum Spurennachweis von Strontium-90 und Strontium-89 in Umweltproben. [s.l.]: [s.n.], 1992.

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Book chapters on the topic "Strontium"

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Nebel, Oliver. "Strontium." In Encyclopedia of Earth Sciences Series, 1–3. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-39193-9_138-1.

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Nebel, Oliver. "Strontium." In Encyclopedia of Earth Sciences Series, 1377–79. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-39312-4_138.

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Meißner, D., and T. Arndt. "Strontium." In Lexikon der Medizinischen Laboratoriumsdiagnostik, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49054-9_2924-1.

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Meißner, D., and T. Arndt. "Strontium." In Springer Reference Medizin, 2229–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-48986-4_2924.

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Brookins, Douglas G. "Strontium." In Eh-pH Diagrams for Geochemistry, 166–67. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73093-1_59.

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Burton, James H. "Strontium isotopes." In Encyclopedia of Geoarchaeology, 916–19. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-1-4020-4409-0_28.

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Nebel, Oliver, and Jessica A. Stammeier. "Strontium Isotopes." In Encyclopedia of Earth Sciences Series, 1–6. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-39193-9_137-1.

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Nebel, Oliver, and Jessica A. Stammeier. "Strontium Isotopes." In Encyclopedia of Earth Sciences Series, 1379–84. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-39312-4_137.

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Bährle-Rapp, Marina. "Strontium Acetate." In Springer Lexikon Kosmetik und Körperpflege, 535. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_10128.

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Bährle-Rapp, Marina. "Strontium Chloride." In Springer Lexikon Kosmetik und Körperpflege, 535. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_10129.

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Conference papers on the topic "Strontium"

1

Vuchkov, N. K., and D. N. Astadjov. "Strontium recombination laser." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/cleo_europe.1994.cthq4.

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The IC-excitation that had been developed in our lab has been applied very successfully in the excitation of CuBr vapor laser.1 The power and efficiency of CuBr vapor lasers have been increased by a factor of 1.5-1.7. In the present work we present the examination of IC-excitation for Sr+ laser.
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Killian, T. C., Y. N. Martinez, P. G. Mickelson, S. B. Nagel, P. Pellegrini, and R. Côté. "Ultracold Collisions in Atomic Strontium." In Laser Science. Washington, D.C.: OSA, 2007. http://dx.doi.org/10.1364/ls.2007.lwh1.

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Yasuda, M., T. Kishimoto, M. Takamoto, and H. Katori. "Photoassociation spectroscopy of ultracold strontium." In International Quantum Electronics Conference, 2005. IEEE, 2005. http://dx.doi.org/10.1109/iqec.2005.1560870.

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Barwood, G. P., P. Gill, H. A. Klein, K. Hosaka, G. Huang, S. N. Lea, H. S. Margolis, K. Szymaniec, and B. R. Walton. "Trapped strontium ion optical clock." In International Conference on Space Optics 2006, edited by Errico Armandillo, Josiane Costeraste, and Nikos Karafolas. SPIE, 2017. http://dx.doi.org/10.1117/12.2308177.

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Mitchell, Lee, Bernard Phlips, Emily G. Jackson, Theodore T. Finne, Richard S. Woolf, and Neil Johnson. "Strontium Iodide Radiation Instrumentation (SIRI)." In UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX, edited by Oswald H. Siegmund. SPIE, 2017. http://dx.doi.org/10.1117/12.2272606.

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Pallecchi, Ilaria, Giuseppe Grassano, Daniele Marre, Luca Pellegrino, Marina Putti, and Antonio S. Siri. "Strontium titanate field effect heterostructures." In AeroSense 2000, edited by Davor Pavuna and Ivan Bozovic. SPIE, 2000. http://dx.doi.org/10.1117/12.397858.

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Wenkun Zhu and Xuegang Luo. "Microbiological precipitation of strontium carbonate." In 2011 International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE). IEEE, 2011. http://dx.doi.org/10.1109/rsete.2011.5965957.

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Lyon, Mary, James L. Archibald, Christopher J. Erickson, and Dallin S. Durfee. "Laser Cooled Strontium Ion Source." In Frontiers in Optics. Washington, D.C.: OSA, 2010. http://dx.doi.org/10.1364/fio.2010.jtua64.

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Bookjans, E., S. Bilicki, G. Vallet, R. Letargat, and J. Lodewyck. "Operational strontium optical lattice clocks." In 2016 Conference on Precision Electromagnetic Measurements (CPEM 2016). IEEE, 2016. http://dx.doi.org/10.1109/cpem.2016.7540549.

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Bober, M., A. Tonoyan, A. Gogyan, M. Witkowski, M. Zawada, P. Ablewski, S. Bilicki, et al. "Strontium Optical Atomic Clocks in KL FAMO Blue Detuned Lattice for Strontium Atoms and Project of a Continuous Active Optical Clock with Cold Strontium Atoms." In 2019 Joint Conference of the IEEE International Frequency Control Symposium anEuropean Frequency and Time Forum (EFTF/IFC). IEEE, 2019. http://dx.doi.org/10.1109/fcs.2019.8856092.

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Reports on the topic "Strontium"

1

Hoeffner, S. L. Strontium Sorption onto SRP Soils. Office of Scientific and Technical Information (OSTI), July 2001. http://dx.doi.org/10.2172/782826.

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Bone, Alexandria N. Optimization of a Strontium Aluminate. Office of Scientific and Technical Information (OSTI), August 2017. http://dx.doi.org/10.2172/1376499.

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T. A. Todd, T. A. Todd, J. D. Law, and R. S. Herbst. Cesium and Strontium Separation Technologies Literature Review. Office of Scientific and Technical Information (OSTI), March 2004. http://dx.doi.org/10.2172/910643.

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Duff, M. C. Characterization of Sorbed Strontium on Monosodium Titanate. Office of Scientific and Technical Information (OSTI), September 2001. http://dx.doi.org/10.2172/786589.

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Quinlan, Kenneth P., Robert M. Hilton, and Joseph A. Adamski. Preparation of the Superconductor Substrate: Strontium Titanate. Fort Belvoir, VA: Defense Technical Information Center, September 1988. http://dx.doi.org/10.21236/ada206800.

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Monetti, M. A. Worldwide deposition of strontium-90 through 1990. Office of Scientific and Technical Information (OSTI), March 1996. http://dx.doi.org/10.2172/243453.

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D. D. Brown A. S. Nagel. Strontium-90 Error Discovered in Subcontract Laboratory Spreadsheet. Office of Scientific and Technical Information (OSTI), July 1999. http://dx.doi.org/10.2172/12185.

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Mei, Renwei. Carbon Dioxide Shuttling Thermochemical Storage Using Strontium Carbonate. Office of Scientific and Technical Information (OSTI), June 2015. http://dx.doi.org/10.2172/1347721.

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Heid, Christy A., Brian P. Ketchel, Gary L. Wood, Richard J. Anderson, and Gregory J. Salamo. 3-D Holographic Display Using Strontium Barium Niobate. Fort Belvoir, VA: Defense Technical Information Center, February 1998. http://dx.doi.org/10.21236/ada338490.

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Weld, David M. Quantum Simulation and Quantum Sensing with Ultracold Strontium. Fort Belvoir, VA: Defense Technical Information Center, September 2015. http://dx.doi.org/10.21236/ada623194.

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