Browsing NTNU Open by Author "Blichfeld, Anders Bank"
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Composition and morphology tuning during hydrothermal synthesis of SrxBa1−xNb2O6 tetragonal tungsten bronzes studied by in situ X-ray diffraction
Grendal, Ola Gjønnes; Blichfeld, Anders Bank; Vu, Tuong-Dan; van Beek, Wouter; Selbach, Sverre Magnus; Grande, Tor; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2019)Current interest in 1D ferroelectric materials calls for cheap, controllable, reproducible and environmentally friendly synthesis routes. Hydrothermal synthesis stands out as one of the most promising routes, but a thorough ... -
Controlled growth of SrxBa1-xNb2O6 hopper- and cube-shaped nanostructures by hydrothermal synthesis
Grendal, Ola Gjønnes; Nylund, Inger-Emma; Blichfeld, Anders Bank; Tominaka, Satoshi; Ohara, Koji; Selbach, Sverre Magnus; Grande, Tor; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2020)Controlling the shape and size of nanostructured materials has been a topic of interest in the field of material science for decades. In this work, the ferroelectric material SrxBa1-xNb2O6 (x = 0.32–0.82, SBN) was prepared ... -
Controlled Growth of SrxBa1−xNb2O6 Hopper‐ and Cube‐Shaped Nanostructures by Hydrothermal Synthesis
Grendal, Ola Gjønnes; Nylund, Inger-Emma; Blichfeld, Anders Bank; Tominaka, Satoshi; Ohara, Koji; Selbach, Sverre Magnus; Grande, Tor; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2020)Controlling the shape and size of nanostructured materials has been a topic of interest in the field of material science for decades. In this work, the ferroelectric material SrxBa1−xNb2O6 (x=0.32–0.82, SBN) was prepared ... -
Enhanced thermoelectric performance and high-temperature thermal stability of p-type Ag-doped β-Zn4Sb3
Song, Lirong; Blichfeld, Anders Bank; Zhang, Jaiwai; Kasai, Hidetaka; Iversen, Bo B (Journal article, 2018)Here we report that the thermoelectric properties of bulk β-Zn4Sb3 can be improved in the range 300–575 K by Ag doping at the Zn sites. Proper Ag doping leads to decreased electrical resistivity and increased Seebeck ... -
Enhanced Thermoelectric Performance through Tuning Bonding Energy in Cu2Se1–xSx Liquid-like Materials
Zhao, Kunpeng; Blichfeld, Anders Bank; Chen, Hongyi; Zhang, Tiansong; Zhu, Chenxi; Ren, Dudi; Hanus, Riley; Qiu, Pengfei; Iversen, Bo B; Xu, Fangfang; Snyder, G. Jeffrey; Xun, Shi; Chen, Lidong (Journal article; Peer reviewed, 2017)Thermoelectric materials require an optimal carrier concentration to maximize electrical transport and thus thermoelectric performance. Element doping and composition off-stoichiometry are the two general and effective ... -
Experimental Investigation of Zinc Antimonide Thin Film Thermoelectric Element over Wide Range of Operating Conditions
Mirhosseini, Mojtaba; Rezania, Alireza; Blichfeld, Anders Bank; Iversen, Bo B; Rosendahl, Lasse A. (Journal article, 2017)Zinc antimonide compounds are among the most efficient thermoelectric (TE) materials with exceptional low thermal conductivity at moderate temperatures up to 350 °C. This study aims to evaluate the performance of a zinc ... -
Experimental setup for high-temperature in situ studies of crystallization of thin films with atmosphere control
Blichfeld, Anders Bank; Bakken, Kristine; Chernyshov, Dmitry; Glaum, Julia; Grande, Tor; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2020)Understanding the crystallization process for chemical solution deposition (CSD) processed thin films is key in designing the fabrication strategy for obtaining high-quality devices. Here, an in situ sample environment is ... -
Extremely low thermal conductivity and high thermoelectric performance in liquid-like Cu2Se1-xSx polymorphic materials
Zhao, Kunpeng; Blichfeld, Anders Bank; Eikeland, Espen; Qiu, Pengfei; Ren, Dudi; Iversen, Bo B; Shi, Xun; Chen, Lidong (Journal article, 2017)Recently, copper chalcogenides Cu2−xδ (δ = S, Se, Te) have attracted great attention due to their exceptional thermal and electrical transport properties. Besides these binary Cu2−xδ compounds, the ternary Cu2−xδ solid ... -
Facile Low Temperature Hydrothermal Synthesis of BaTiO3 Nanoparticles Studied by In Situ X-ray Diffraction
Grendal, Ola Gjønnes; Blichfeld, Anders Bank; Skjærvø, Susanne Linn; van Beek, Wouter; Selbach, Sverre Magnus; Grande, Tor; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2018)Ferroelectric materials are crucial for today’s technological society and nanostructured ferroelectric materials are important for the downscaling of devices. Controlled and reproducible synthesis of these materials are, ... -
A fast, low temperature synthesis method for hexagonal YMnO3: Kinetics, purity, size and shape as studied by in situ X-ray diffraction
Marshall, Kenneth; Blichfeld, Anders Bank; Skjærvø, Susanne Linn; Grendal, Ola Gjønnes; Van Beek, Wouter; Selbach, Sverre Magnus; Grande, Tor; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2020)The reaction mechanisms, phase development and kinetics of the hydrothermal synthesis of hexagonal‐YMnO3 from Y2O3 and Mn2O3 using in situ X‐ray diffraction are reported under different reaction conditions with temperatures ... -
High thermoelectric performance and low thermal conductivity in Cu2−yS1/3Se1/3Te1/3 liquid-like materials with nanoscale mosaic structures
Zhao, Kunpeng; Zhu, Chenxi; Qiu, Pengfei; Blichfeld, Anders Bank; Eikeland, Espen; Ren, Dudi; Iversen, Bo B; Xu, Fangfang; Shi, Xun; Chen, Lidong (Journal article, 2017)Mosaic-crystal microstructure is one of the optimal strategies for decoupling and balancing thermal and electrical transport properties in thermoelectric materials. Herein, we successfully achieve the desired nanoscale ... -
Hydrothermal synthesis of SrxBa1–xNb2O6 on nanostructured substrates
Einarsrud, Mari-Ann (Master thesis, 2019)I nyere tid har syntese av bly-frie ferroelektriske materialer tiltrukket seg stadig mer oppmerksomhet og et av de studerte materialene er strontium barium niobat (SBN). SBN har vist gode elektro-optiske egenskaper, samt ... -
In situ X-ray diffraction studies of the crystallization of K0. 5Na0. 5NbO3 powders and thin films from an aqueous synthesis route
Bakken, Kristine; Gaukås, Nikolai Helth; Grendal, Ola Gjønnes; Blichfeld, Anders Bank; Tominaka, Satoshi; Ohara, Koji; Chernyshov, Dmitry; Glaum, Julia; Grande, Tor; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2021)Aqueous chemical solution deposition is a promising route for ferroelectric K0.5Na0.5NbO3 (KNN) thin films, requiring a stable precursor solution with complexed Nb5+. Here, we report on the local structure of Nb-complexes ... -
Mechanisms for texture in BaTiO3 thin films from aqueous chemical solution deposition
Bakken, Kristine; Blichfeld, Anders Bank; Chernyshov, Dmitry; Grande, Tor; Glaum, Julia; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2020)The prototype piezoelectric material BaTiO3 is widely used in e.g., capacitators. Chemical solution deposition (CSD) of BaTiO3 films is a simple and environmentally friendly processing route, but insight in the crystallization ... -
Revealing the Slow Decomposition Kinetics of Type-I clathrate Ba8Ga16Ge30
Reardon, Hazel; Blichfeld, Anders Bank; Kasai, Hidetaka; Yin, Hao; Bøjesen, Espen Drath; Iversen, Bo B (Journal article; Peer reviewed, 2017)Inconsistencies in high temperature thermoelectric property measurements of Ba8Ga16Ge30 have prompted our study on the thermal stability of this heavily studied inorganic clathrate. Using X-ray diffraction, thermal analysis, ... -
Structure and Optical Properties of Titania-PDMS Hybrid Nanocomposites Prepared by In Situ Non-Aqueous Synthesis
Dalod, Antoine Robert Marie; Grendal, Ola Gjønnes; Blichfeld, Anders Bank; Furtula, Vedran; Pérez, Javier; Henriksen, Lars; Grande, Tor; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2017)Organic-inorganic hybrid materials are attractive due to the combination of properties from the two distinct types of materials. In this work, transparent titania-polydimethylsiloxane hybrid materials with up to 15.5 vol. ... -
Structures and Role of the Intermediate Phases on the Crystallization of BaTiO3 from an Aqueous Synthesis Route
Bakken, Kristine; Pedersen, Viviann Hole; Blichfeld, Anders Bank; Nylund, Inger-Emma; Tominaka, Satoshi; Ohara, Koji; Grande, Tor; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2021)Carbonate formation is a prevailing challenge in synthesis of BaTiO3, especially through wet chemical synthesis routes. In this work, we report the phase evolution during thermal annealing of an aqueous BaTiO3 precursor ... -
Tailoring preferential orientation in BaTiO3-based thin films from aqueous chemical solution deposition
Bakken, Kristine; Blichfeld, Anders Bank; Nylund, Inger-Emma; Chernyshov, Dmitry; Glaum, Julia; Grande, Tor; Einarsrud, Mari-Ann (Journal article, 2021)Ferroelectric properties of thin films can be enhanced by crystallographic texture. In this work, we report on how heat treatment of films can be designed to tailor the degree of preferential orientation in BaTiO3-based ... -
Thermal evolution of the crystal structure and phase transitions of KNbO3
Skjærvø, Susanne Linn; Wells, Kristin Høydalsvik; Blichfeld, Anders Bank; Einarsrud, Mari-Ann; Grande, Tor (Journal article; Peer reviewed, 2018)The thermal evolution of the crystal structure and phase transitions of KNbO3 were investigated by high-temperature powder X-ray diffraction and Rietveld refinement of the diffraction data. Two phase transitions from ... -
Thermoelectric properties of Cu2Se1−xTex solid solutions
Zhao, Kunpeng; Guan, Mengjia; Qiu, Pengfei; Blichfeld, Anders Bank; Eikeland, Espen; Zhu, Chenxi; Ren, Dudi; Xu, Fangfang; Iversen, Bo B; Xun, Shi; Chen, Lidong (Journal article, 2018)Binary Cu2Se and Cu2Te have gained great attention recently because of their interesting and abnormal physical properties, such as ultralow thermal conductivity, high carrier mobility, large effective mass of carriers and ...