Reference number : GC-2017-Q1-02222, amendment number : , agreement type : G, recipient legal name : Crandles, David (Brock University), recipient country : CA, recipient province : nan, recipient city : Ontario, recipient postal code : nan, program name english : Discovery Grants Program - Individual, program name french : Programme de subventions à la découverte - individuelles, program purpose english : High Permittivity materials are of great interest because of important existing applications in cell phone networks and potential applications in electrostatic energy storage devices (capacitors). To be of potential use in capacitors, a material will require "giant permittivity" that is temperature independent. To be of potential use in a dielectric resonator, which is a common component in cell phone networks, the energy "loss" must be minimized, while maintaining a reasonably high and temperature-independent permittivity. This research proposal will address fundamental questions regarding both of these applications. Since 2013, giant permittivity has been thought to have been observed in two novel materials: "co-doped oxides" in which the permittivity increase is due to &ldquo;defect dipoles&rdquo; and "high entropy oxides" in which the permittivity increase is not understood. Recent tests have suggested that the observation of giant permittivity in co-doped oxides is strongly affected by electrical contacts. The open question as to whether &ldquo;defect dipoles&rdquo; can actually increase permittivity will be studied using a contact-free technique in compensated silicon. If this mechanism is demonstrated, it may lead to the development of co-doped higher band gap materials which may be useful in energy storage. We will also perform tests in the high entropy oxides, to see if previous observations of giant permittivity made by measuring capacitance at low frequency are similarly affected by electrical contacts. Turning to dielectric resonator materials, note that the lowest loss material commonly used, the ordered perovskite BaMg 1/3 Ta 2/3 O 3 , is extremely expensive because it incorporates tantalum. Many researchers have proposed using niobium-based materials to replace expensive tantalum. However, the loss mechanisms in the niobium-based materials are poorly understood. For example, while the loss in BaMg 1/3 Nb 2/3 O 3 has been predicted to be good enough for resonator applications, the losses observed in samples produced up to this point in time have been very large. Funds requested in this proposal will be used to perform a systematic study of dielectric loss in niobium-based dielectric resonator materials using a combination of x-ray diffraction and wide-frequency-range dielectric spectroscopy. The goal is to understand whether chemical composition and processing conditions can be slightly modified to decrease loss. Developing a niobium based material that could compete with tantalum based materials in terms of performance and price would be a significant and useful achievement., program purpose french : High Permittivity materials are of great interest because of important existing applications in cell phone networks and potential applications in electrostatic energy storage devices (capacitors). To be of potential use in capacitors, a material will require "giant permittivity" that is temperature independent. To be of potential use in a dielectric resonator, which is a common component in cell phone networks, the energy "loss" must be minimized, while maintaining a reasonably high and temperature-independent permittivity. This research proposal will address fundamental questions regarding both of these applications. Since 2013, giant permittivity has been thought to have been observed in two novel materials: "co-doped oxides" in which the permittivity increase is due to &ldquo;defect dipoles&rdquo; and "high entropy oxides" in which the permittivity increase is not understood. Recent tests have suggested that the observation of giant permittivity in co-doped oxides is strongly affected by electrical contacts. The open question as to whether &ldquo;defect dipoles&rdquo; can actually increase permittivity will be studied using a contact-free technique in compensated silicon. If this mechanism is demonstrated, it may lead to the development of co-doped higher band gap materials which may be useful in energy storage. We will also perform tests in the high entropy oxides, to see if previous observations of giant permittivity made by measuring capacitance at low frequency are similarly affected by electrical contacts. Turning to dielectric resonator materials, note that the lowest loss material commonly used, the ordered perovskite BaMg 1/3 Ta 2/3 O 3 , is extremely expensive because it incorporates tantalum. Many researchers have proposed using niobium-based materials to replace expensive tantalum. However, the loss mechanisms in the niobium-based materials are poorly understood. For example, while the loss in BaMg 1/3 Nb 2/3 O 3 has been predicted to be good enough for resonator applications, the losses observed in samples produced up to this point in time have been very large. Funds requested in this proposal will be used to perform a systematic study of dielectric loss in niobium-based dielectric resonator materials using a combination of x-ray diffraction and wide-frequency-range dielectric spectroscopy. The goal is to understand whether chemical composition and processing conditions can be slightly modified to decrease loss. Developing a niobium based material that could compete with tantalum based materials in terms of performance and price would be a significant and useful achievement., agreement title english : Spectroscopic Studies of High Permittivity Materials, agreement title french : Spectroscopic Studies of High Permittivity Materials, agreement number : RGPIN, agreement value : 105000.0, agreement start date : 2017-05-10, agreement end date : nan, description english : nan, description french : nan, expected results english : nan, expected results french : nan, additional information english : Grant or Award spanning more than one fiscal year. (2017-2018 to 2022-2023), additional information french : Subvention ou bourse octroyée s'appliquant à plus d'un exercice financier. (2017-2018 à 2022-2023), owner organization : nserc-crsng, owner organization title : Natural Sciences and Engineering Research Council of Canada | Conseil de recherches en sciences naturelles et en génie du Canada