Elastic, Piezoelectric, and Dielectric Properties of Lithium Tantalate

Smith, R. T.

doi:10.1063/1.1755072

Cited by 43 publications

(7 citation statements)

References 9 publications

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“…Tantalum oxide was of interest in this work because lithium tantalate, LiTaO 3 , is not only a possible lithium-ion conducting material when in a proper form , but also a well-known optical, ferroelectric, and piezoelectric material , with potential uses in, for example, optical waveguides . Ta 2 O 5 films were deposited using tantalum ethoxide and water and were amorphous as-deposited .…”

Section: Resultsmentioning

confidence: 99%

Preparation of Lithium Containing Oxides by the Solid State Reaction of Atomic Layer Deposited Thin Films

et al. 2017

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Lithium containing multicomponent oxides are important materials for both lithium-ion batteries and optical applications. In most cases thin films of these materials are desired. Atomic layer deposition (ALD) is a thin film deposition method that is known to deposit high quality films by sequential self-limiting surface reactions. However, the reactivity of lithium ions during the deposition process can pose challenges for the control of the film growth and even destroy the selflimiting nature of ALD completely. In this paper, we have studied the combination of atomic layer deposition and solid state reactions for the generation of lithium containing multicomponent oxide films. Atomic layer deposited transition metal oxide thin films were covered with ALD-grown lithium carbonate, and the films were annealed to produce lithium tantalate, titanate, and niobate. Lithium carbonate was chosen as the source of lithium because it is easy to deposit by ALD and can be handled in air. The films were analyzed as-deposited and after annealing using grazing incidence X-ray diffraction (GIXRD), field emission scanning electron microscopy (FESEM), and time-of-flight elastic recoil detection analysis (ToF-ERDA). By this method we were able to produce crystalline and very close to stoichiometric films of LiTaO 3 , Li 2 TiO 3 , and LiNbO 3 . The films showed only small amounts of carbon and hydrogen impurities after annealing. After prolonged annealing at high temperatures, lithium silicates began to form as a result of lithium ions reacting with the silicon substrates.

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Section: Resultsmentioning

confidence: 99%

Preparation of Lithium Containing Oxides by the Solid State Reaction of Atomic Layer Deposited Thin Films

et al. 2017

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“…Dielectric constant values obtained from the dehydrated material were estimated to be of the order 20-30 (although no correction for sample porosity was made) and exhibited little temperature dependence. Other ferroelectric materials, however, also have low dielectric constants (e.g., ε′ < 100 in PbTiO 3 29 and ε′ < 50 in LiTaO 3 30 ) and exhibit little temperature dependence when not in the vicinity of a structural phase transition.…”

Section: Discussionmentioning

confidence: 99%

Leakage and Proton Conductivity in the Predicted Ferroelectric CsBiNb₂O₇

et al. 2009

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The layered perovskite CsBiNb 2 O 7 has been reinvestigated in the light of recent predictions of ferroelectric behavior. Variable temperature powder neutron diffraction experiments show that this material retains polar symmetry (space group P2 1 am) up to at least 900 °C, with only a slight decrease in net polarization up to this temperature, calculated using a simple ionic model. However, ac impedance measurements show only a modest dielectric constant (19-27) throughout the temperature range studied. Moreover, convincing evidence for ferroelectric behavior in polarizationselectric field loops could not be obtained because of overriding electrical conductivity. Further measurements of electrical behavior, at different temperatures and under both "wet" and "dry" atmospheres, provide clear evidence that CsBiNb 2 O 7 is hygroscopic, with water uptake resulting in significant protonic conductivity. Even in the "dehydrated" state the material is a semiconductor with a modest conductivity of 3.8 µS cm -1 at 250 °C. Although ferroelectric behavior is not observed in the samples studied here, we cannot rule out the possibility that ferroelectricity might be obtained in samples processed under appropriate conditions.

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“…Lithium tantalate, similarly to lithium niobate, is an interesting ferroelectric material [132,133]. Its amorphous form has also been suggested as a possible solid electrolyte material for lithium ions [117,134,135].…”

Section: Methodsmentioning

confidence: 99%

Metal Fluorides as Lithium-Ion Battery Materials: An Atomic Layer Deposition Perspective

2018

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Lithium-ion batteries are the enabling technology for a variety of modern day devices, including cell phones, laptops and electric vehicles. To answer the energy and voltage demands of future applications, further materials engineering of the battery components is necessary. To that end, metal fluorides could provide interesting new conversion cathode and solid electrolyte materials for future batteries. To be applicable in thin film batteries, metal fluorides should be deposited with a method providing a high level of control over uniformity and conformality on various substrate materials and geometries. Atomic layer deposition (ALD), a method widely used in microelectronics, offers unrivalled film uniformity and conformality, in conjunction with strict control of film composition. In this review, the basics of lithium-ion batteries are shortly introduced, followed by a discussion of metal fluorides as potential lithium-ion battery materials. The basics of ALD are then covered, followed by a review of some conventional lithium-ion battery materials that have been deposited by ALD. Finally, metal fluoride ALD processes reported in the literature are comprehensively reviewed. It is clear that more research on the ALD of fluorides is needed, especially transition metal fluorides, to expand the number of potential battery materials available.

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Elastic, Piezoelectric, and Dielectric Properties of Lithium Tantalate

Cited by 43 publications

References 9 publications

Preparation of Lithium Containing Oxides by the Solid State Reaction of Atomic Layer Deposited Thin Films

Preparation of Lithium Containing Oxides by the Solid State Reaction of Atomic Layer Deposited Thin Films

Leakage and Proton Conductivity in the Predicted Ferroelectric CsBiNb₂O₇

Metal Fluorides as Lithium-Ion Battery Materials: An Atomic Layer Deposition Perspective

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Elastic, Piezoelectric, and Dielectric Properties of Lithium Tantalate

Cited by 43 publications

References 9 publications

Preparation of Lithium Containing Oxides by the Solid State Reaction of Atomic Layer Deposited Thin Films

Preparation of Lithium Containing Oxides by the Solid State Reaction of Atomic Layer Deposited Thin Films

Leakage and Proton Conductivity in the Predicted Ferroelectric CsBiNb2O7

Metal Fluorides as Lithium-Ion Battery Materials: An Atomic Layer Deposition Perspective

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Leakage and Proton Conductivity in the Predicted Ferroelectric CsBiNb₂O₇