The thermal conductivity of BaTiO3 in the neighbourhood of its ferroelectric transition temperatures

Mante, A.J.H.; Volger, J.

doi:10.1016/0375-9601(67)90729-3

Cited by 57 publications

(31 citation statements)

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“…In order to compare it with the experiments, we make use of the following values which are about PbTiO 3 crystal: ρ =7.1g/cm 3 [16], l =900cal/mol [17], k fer =8.8 × 10 5 erg/cm s K [18]. The value of the velocity of the interface's fast motion, which has been measured in the experiments, is 0.5mm/s [11].…”

Section: Description Of Phase Transitions and Verification Of Interfamentioning

confidence: 99%

Advances in Thermodynamics of Ferroelectric Phase Transitions

Ai¹

2012

Advances in Ferroelectrics

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Section: Description Of Phase Transitions and Verification Of Interfamentioning

confidence: 99%

Advances in Thermodynamics of Ferroelectric Phase Transitions

Ai¹

2012

Advances in Ferroelectrics

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“…In order to compare it with experiments, we make use of the following values which are about PbTiO 3 crystal: ρ =7.1g/cm 3 (Chewasatn & Milne, 1994), l =900cal/mol (Nomura & Sawada, 1955), fer k =8.8 × 10 5 erg/cm﹒s﹒K (Mante & Volger, 1967). The value of the velocity of the interface's fast motion, which has been measured by the experiments, is 0.5mm/s (Dec, 1988).…”

Section: Verification Of Interface Dynamicsmentioning

confidence: 99%

Non-Equilibrium Thermodynamics of Ferroelectric Phase Transitions

Ai¹

2010

Ferroelectrics

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“…A clear reduction in the thermal conductivity of the ng-BaTiO 3 compared to the epitaxial film is observed even for grain sizes as large as 63 nm. As expected, the epitaxial thin film sample shows a higher thermal conductivity than any nano-grained samples, but is a factor of two lower than the reported bulk values [69,71], which is attributed mainly to film size effects.…”

Section: Thermal Measurements and Phonon-grain Boundary Interactionsmentioning

confidence: 69%

“…In the mid 1900's, bulk single crystal thermal properties were determined by Mante and Volger using steady state heat flow techniques [71]. More recent measurements of the thermal conductivity of bulk, single crystalline BaTiO 3 have reported values slightly lower than the original measurements [69].…”

Section: Literature Thermal Conductivity Of Batiomentioning

confidence: 99%

“…Historically, the underlying physics of thermal transport in oxides was observed experimentally using bulk techniques involving a variety of macroscale heaters and temperature sensors [15,61,62,70,71]. This method has been somewhat standardized with tooling such as Quantum Design's Physical Property Measurement System (PPMS), which is the system used in the Tachibana et al…”

Section: Thermal Transport In Functional Oxidesmentioning

confidence: 99%

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Understanding Phonon Interactions with Defects in Functional Oxide Materials

Donovan¹

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Understanding of nano-scale thermal transport has enabled significant advances in a wide variety of fields including microelectronics, alternative energy, optics, and many more [1][2][3][4]. Utilized in many of these applications are a class of materials known as functional oxides. These materials are oxygen compounds with specific functional properties of interest (e.g., dielectrics [5][6][7][8], piezoelectrics [9][10][11], photovoltaics [12][13][14], thermoelectrics [15][16][17][18][19]). Often it is the defects in these materials that enable functionality and, depending on the processing and operating conditions, the concentration and types of defects that are present in these materials can vary widely [20]. In this dissertation, I aim to identify the role that defects play in functional oxide materials with respect to thermal transport.The major thermal carriers in most functional oxide crystals are collective lattice vibrations, or phonons [21]. Phonon-dominated thermal conductivity is dictated by the scattering of these thermal carriers with a variety of other components or the material system, including defects in the crystal [22,23]. I concentrate on three types of defects that are common in functional oxides: boundaries, extrinsic point defects, and intrinsic point defects.Boundaries such as film boundaries and grain boundaries with nano-scale dimensions can be detrimental to the thermal conductivity of a material. As the length of the uninterrupted crystal reduces to the phonon mean free paths in the crystal, phonons will scatter readily off of nano-scale boundaries and will not be able to propagate as they would in a bulk environment. This becomes particularly relevant in technologies such as the microelectronics industry, where device size scales are well below common phonon mean free paths in the constituent materials. To study this, I turn to one of the more common functional oxides used in the microelectronics industry, BaTiO 3 .I study the effects of nano-scale grains on thin films of BaTiO 3 grown via chemical solution deposition. The films studied are 150 nm and range in grain size from 36 nm -63 nm. I show that the thermal conductivity of these nano-grained films scales with the grain size and film thickness and demonstrate agreement of this trend with analytical models. This result demonstrates that despite a complex crystal structure, there is a mean free path spectrum of phonons in BaTiO 3 that significantly exceeds the dimensions of the grains and film (contrary to the common "gray" mean 2 free path assumption seen in literature).To address the role of extrinsic point defects, or dopants, on the thermal conductivity of functional oxides, I study the effects of dysprosium doping in thin films of cadmium oxide deposited by molecular beam epitaxy. In this experiment, the addition of Dy dopants in CdO actually increases the thermal conductivity initially, owing to a reduction in the equilibrium concentration of oxygen vacancies (a type of defect that is intrinsic to all oxides). The de...

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The thermal conductivity of BaTiO3 in the neighbourhood of its ferroelectric transition temperatures

Cited by 57 publications

References 13 publications

Advances in Thermodynamics of Ferroelectric Phase Transitions

Advances in Thermodynamics of Ferroelectric Phase Transitions

Non-Equilibrium Thermodynamics of Ferroelectric Phase Transitions

Understanding Phonon Interactions with Defects in Functional Oxide Materials

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