0000000000041571

AUTHOR

R. G. Mitarov

showing 3 related works from this author

Heat capacity and thermal conductivity of multiferroics Bi1-xPrxFeO3

2019

The heat capacity and thermal conductivity of multiferroics Bi1–xPrxFeO3 (0 ≤ x ≤ 0.50) has been studied in the temperature range of 130–800 K. A slight substitution of praseodymium for bismuth is found to lead to a noticeable shift of the antiferromagnetic phase transition temperature whilst the heat capacity increases. The temperature dependences of the heat capacity and thermal conductivity exhibit additional anomalies during phase transitions. The experimental results suggest that the excess heat capacity can be attributed to the Schottky effect for three-level states. The basic mechanisms of the heat transfer of phonons are highlighted and the dependence of the mean free path on temper…

heat capacityMaterials sciencePraseodymiumMultiferroicschemistry.chemical_elementThermodynamics02 engineering and technology01 natural sciencesHeat capacityBismuthThermal conductivity0103 physical sciencesMaterials Chemistry:NATURAL SCIENCES:Physics [Research Subject Categories]Multiferroicsthermal conductivityElectrical and Electronic Engineering010302 applied physicsAtmospheric temperature range021001 nanoscience & nanotechnologyCondensed Matter PhysicsElectronic Optical and Magnetic MaterialschemistryControl and Systems EngineeringCeramics and Composites0210 nano-technology
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Thermal properties of multiferroic Bi1−xEuxFeO3 (х = 0–0.40) ceramics

2017

Abstract A study of thermal diffusion, heat capacity and thermal conductivity of multiferroic Bi 1−x Eu x FeO 3 (x = 0–0.4) within the range of 130–1200 K is reported. Modifying by admixture of Eu is found to change substantially the thermal anomalies of diffusion and thermal conductivity of the antiferromagnetic phase transition, to increase heat capacity over a wide range of temperatures and to shift the antiferromagnetic transition temperature. The excess heat capacity is shown being related to Schottky effect of three-level states. The mechanisms dominating thermal transfer of phonons at the phase transition and dependence of the mean free path of phonons on the temperature are determin…

Thermal effective massPhase transitionMaterials scienceCondensed matter physicsMechanical EngineeringTransition temperatureMetals and Alloys02 engineering and technologyThermal transfer021001 nanoscience & nanotechnologyThermal conductionThermal diffusivity01 natural sciencesHeat capacityThermal conductivityMechanics of Materials0103 physical sciencesMaterials Chemistry010306 general physics0210 nano-technologyJournal of Alloys and Compounds
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Thermal properties of ferroelectric 0.7PbNi1/3Nb2/3O3–0.3PbTiO3ceramics

2013

A study of heat capacity as function of temperature of the 0.7PbNi1/3Nb2/3O3–0.3PbTiO3 solid solution within the 120–800 K range is reported. Broad anomalies on the curve of heat capacity are revealed in the 250–450 K and 450–650 K intervals peaking at 520 K and a λ-anomaly at T ≈ 225 K. Results are discussed with account for dielectric and structural data.

Range (particle radiation)Phase transitionMaterials scienceCondensed matter physicsThermodynamicsDielectricHeat capacityFerroelectricityvisual_artThermalvisual_art.visual_art_mediumGeneral Materials ScienceCeramicInstrumentationSolid solutionPhase Transitions
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