Article
Materials Science, Ceramics
Yangming Hu, Xiansheng Liu, Wei Wei, Huanli Yuan, Gaojie Zeng, Qilong Gao, Juan Guo, Mingju Chao, Erjun Liang
Summary: The solid solutions of Zr1+xMn1-xMo3-2xV2xO12 have been developed by introducing V5+ into ZrMnMo3O12, which shows reduced phase transition temperature and negative thermal expansion (NTE) property. The NTE property is induced by low-frequency phonons and makes it a material with great potential for applications.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Yige Du, Qilong Gao, Andrea Sanson, Hengli Xie, Yangming Hu, Gaojie Zeng, Juan Guo, Xiao Ren, Erjun Liang
Summary: This study demonstrates the expansion of the NTE temperature zone in Mg2P2O7-based bulk material by doping Cu atom on the Mg site. The NTE in Mg1.9Cu0.1P2O7 bulk material is found to be derived from the phase transition of alpha- and beta-phase. This work provides a way to optimize the negative thermal expansion property in phase transition typed materials.
RESULTS IN PHYSICS
(2022)
Article
Materials Science, Ceramics
Ryosuke Uehara, Ryo Kaneda, Takahiro Takei, Nobuhiro Kumada, Sachiko Matsushita, Akira Nakajima, Toshihiro Isobe
Summary: We evaluated the thermal expansion of Zr2-xMxSyP2O12-delta and found that it had negative thermal expansion, similar to Zr2SP2O12. The substitution of ions could control the volumetric coefficient of thermal expansion. The lowest alpha v value was approximately -117 ppm/K for Zr1.7Y0.3SP2O12-delta at 373-453 K.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Xiangkai Hao, Mengyue Wang, Xiansheng Liu, Yumeng Xiang, Jianjun Tian, Weifeng Zhang, Yu Jia, Erjun Liang
Summary: In this study, researchers successfully prepared AFCMW with low thermal expansion coefficient and low phase-transition temperature, and combined it with CNMW to create an AFCMW-CNMW composite with low thermal expansion. They found that the phase-transition temperature reduction in A2Mo3O12 is mainly attributed to the high-entropy effect resulting from the introduction of different ions. Furthermore, they discovered that the low thermal expansion of the AFCMW-CNMW composite is due to the opposite thermal expansion behaviors of AFCMW and CNMW.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Hui Wei, Jing Li, Feng Hu, Yang Han, Bensong Chen, Honglin Li, Yang Zhang, Xiaodong Wang, Xiaoyong Xu
Summary: This study analyzed the characteristics and crystal structure of ZrW2-xMoxO8 (0≤x≤1). The materials exhibited a systematic change in the coefficient of thermal expansion, from negative values to zero thermal expansion, with increasing x. The study also investigated the mechanism of the ordered-disordered phase transition and the impact of Mo substitution on the electronic structure using in-situ X-ray diffraction and in-situ Raman spectroscopy.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
X. L. Wang, P. Tong, J. C. Lin, X. K. Zhang, C. Yang, Z. C. Wang, M. Wang, Y. Wu, L. Zhang, W. Tong, W. H. Song, Y. P. Sun
Summary: This study reports the negative thermal expansion behavior in hexagonal Fe1-xCoxS alloys and suggests that the NTE of alloys with anisotropic lattice thermal expansion can be effectively adjusted by controlling the microstructure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Naike Shi, Yuzhu Song, Chang Zhou, Longlong Fan, Jun Chen
Summary: Negative thermal expansion (NTE) has been studied in various materials, but only a few materials exhibit giant NTE and there is a lack of methods to improve it. This study achieved a giant NTE in Zn(2-x)CuxP(2)O(7) ceramics through microstructure effect. Dilatometry measurements showed a linear contraction of 0.9% (3.L/L = 2.7%) when heated from 30°C to 125°C, while X-ray diffraction revealed an intrinsic crystallographic volume contraction of only 1.68%. The enhancement of NTE in the ceramic sample was attributed to the shrinkage of voids observed through in-situ atomic force microscope (AFM). This is the first experimental evidence of the microstructure effect on NTE observed by AFM. Microstructure effect is an effective method to achieve giant NTE.
CERAMICS INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Ran Chen, Qilong Gao, Yongqiang Qiao, Juan Guo, Erjun Liang
Summary: Control of thermal expansion is crucial for functional materials. In this study, the thermal expansion of Ni2P2O7-based materials was controllable from negative to zero to positive by doping Mn. XRD and Raman analysis revealed that the negative thermal expansion originated from a change in phase proportion. This work provides new insight into improving the negative thermal expansion in phase transition materials.
SCRIPTA MATERIALIA
(2022)
Review
Materials Science, Multidisciplinary
Yuzhu Song, Naike Shi, Shiqing Deng, Xianran Xing, Jun Chen
Summary: The review summarizes the progress in magnetic NTE materials from Invar alloys to newly discovered materials like Mn-based antiperovskites, Laves phases, La(Fe, Si)13, Mn3Ge, R2Fe17, R(Fe,V)12, and R2Fe14B (R = rare earth elements). The NTE properties of magnetic materials can be controlled by adjusting magnetic exchange interaction through methods like chemical substitution, nanocrystallization, external field, and interstitial atoms. The main mechanisms of NTE of magnetic materials, including order-to-disorder transition, change of local moment, metamagnetic transition, short-range magnetic ordering, structural phase transition, and coexistence of magnetic phases, are summarized.
PROGRESS IN MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Si-Yuan Ge, Rui-Kang Huang, Jia-bing Wu, Kiyonori Takahashi, Chi-Sing Lee, Takayoshi Nakamura
Summary: In this study, a novel organic crystalline supramolecular rotor, [(3-chloro-1-adamantylammonium)-(18-crown-6)]-ClO4, was reported, exhibiting planar positive-zero-negative thermal expansion along the a- and c-axes, with zero thermal expansion behavior in the range of 250-317K. X-ray single-crystal structures, differential scanning calorimetry (DSC) measurements, and molecular dynamics simulations revealed that this unique transition in thermal expansion is a result of the static-swing-rotation transition of 18-crown-6 in the crystal structure.
CHEMISTRY OF MATERIALS
(2023)
Article
Physics, Applied
Y. Kadowaki, R. Kasugai, Y. Yokoyama, N. Katayama, Y. Okamoto, K. Takenaka
Summary: This study reports the discovery of giant negative thermal expansion (NTE) in Ti2O3, with potential for enhanced NTE through partial substitution of Ti with Nb. The anisotropic thermal deformation of the crystallographic unit cell in Ti2O3 induces large bulk NTE, despite diffraction experiments indicating positive thermal expansion in the temperature range studied. The findings suggest promising developments in NTE materials tailored to address microstructural effects.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
L. Lu Xie, T. Fei Shi, J. Chao Lin, X. Kai Zhang, X. Kang Zhong, K. Ke Liu, B. Ke Dong, Cheng Yang, X. Lian Wang, T. Jiao Xiong, W. Sheng Yan, J. Ping Xu, H. Can Chen, Wen Yin, Ming Li, Peng Tong, W. Hai Song, Y. Ping Sun
Summary: Controlling the concentration of oxygen vacancy is a useful approach for optimizing the functional properties of oxides. However, little attention has been paid to the effect of oxygen vacancy on negative thermal expansion (NTE), despite oxide-typed NTE materials accounting for over 40% of the total NTE materials. This study demonstrates that the synthesis temperature significantly impacts the linear coefficient of thermal expansion of copper pyrophosphate, with an improvement from -13.88 to -36.60 ppm/K when the temperature is increased. The study also confirms the presence of selective vacancies in the O1 site, which suppresses both phase-transition and framework-structure driven NTE.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Qi Shen, Ivan Batashev, Fengqi Zhang, Hamutu Ojiyed, Iulian Dugulan, Niels van Dijk, Ekkes Bruck
Summary: In this study, we investigated the negative thermal expansion and magnetocaloric effect in Fe2Hf1-xTix (x = 0.15, 0.27, 0.30, 0.33, 0.36, 0.40) alloys prepared by arc melting and rapid solidification. We found that two hexagonal phases with slightly different compositions exhibited the same lattice symmetry but different lattice parameters. The saturation magnetization and Curie temperature showed a decreasing trend with the average unit-cell volume. Melt spinning improved the saturation magnetization and magnetic entropy change, attributed to improved homogeneity due to suppression of phase segregation during rapid solidification. Neutron powder diffraction and Mössbauer spectroscopy illustrated the correlation between magnetic order and negative thermal expansion in Fe2Hf0.85Ti0.15.
Article
Physics, Multidisciplinary
Chenjun Zhang, Xiaoke He, Zhiyu Min, Baozhong Li
Summary: The addition of P in ZrW2-x PxO8-0.5x can affect the crystal structure and thermal expansion properties. Substituting W with P reduces the sintering temperature and phase transition temperature, and enhances the negative thermal expansion property.
Article
Nanoscience & Nanotechnology
Zhao Pan, Xingxing Jiang, Runze Yu, Yang Ren, Zheshuai Lin, Jun Chen, Masaki Azuma, Xianran Xing
Summary: This study proposes a promising method to control thermal expansion by adjusting the proportion of cations with different ferroelectric activities, which enables the transformation from large volume contraction to nonlinear strong negative thermal expansion.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Applied
Yasunori Yokoyama, Shunsuke Yano, Riku Kurita, Morise Karasawa, Hikaru Tanaka, Hiroshi Takahashi, Takashi Kikukawa, Masashi Sonoyama, Koshi Takenaka
Summary: This study discusses the effects of a gel network structure on the spontaneous stacking of purple membrane (PM), finding that a porous gel network is necessary for PM stacking in immobilized samples. The interplay between the PM periodic pre-structures and the type of gel network for PM stacking is proposed based on the results.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Tomoya Kanematsu, Yoshihiko Okamoto, Koshi Takenaka
Summary: The study found that AgCrS2 exhibits a significant strain under a magnetic field, with a volume change of over 700ppm, one of the largest measured for antiferromagnets to date. This phenomenon only occurs at the Neel temperature of 42K and can be initialized by cooling the sample to well below the Neel temperature.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Koshi Takenaka, Takuto Sugiura, Yoshifumi Kadowaki, Masaki Ozeki, Yoshihiko Okamoto, Asaya Fujita
Summary: This study systematically investigated the volumetric and caloric effects associated with magnetic transition in a series of manganese nitrides based on Mn3GaN. It was found that the nitrogen deficiency can influence the antiferromagnetic transition temperature and the volume and entropy changes with increasing pressure. The anomalous magnetic properties observed in high pressure may be attributed to the complex bond length dependence of the magnetic interaction.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2021)
Article
Materials Science, Multidisciplinary
Koshi Takenaka, Kentaro Otsuka, Yoshihiko Okamoto, Yuji Kume, Makoto Kobashi
Summary: The study demonstrates that the composite of antiperovskite manganese nitride with aluminum formed by compressive torsion processing can effectively suppress chemical erosion at a lower temperature, reduce thermal expansion, and electrical resistivity, making it a promising candidate for metal matrix composites containing giant negative thermal expansion fillers.
MATERIALS TRANSACTIONS
(2021)
Article
Physics, Applied
Koshi Takenaka, Masato Kano, Ryota Kasugai, Kohei Takada, Koki Eto, Yoshifumi Kadowaki, Yasunori Yokoyama, Naoyuki Katayama, Yoshihiko Okamoto
Summary: Cu1.8Zn0.2V2-xPxO7 exhibits negative thermal expansion (NTE) and NTE enhancement can be achieved through microstructural effects. Preliminary measurements also show higher resistivity and lower dielectric constant, making it suitable for electronic devices.
APPLIED PHYSICS EXPRESS
(2022)
Article
Chemistry, Physical
Lei Hu, Yingcai Zhu, Yue-Wen Fang, Masayuki Fukuda, Takumi Nishikubo, Zhao Pan, Yuki Sakai, Shogo Kawaguchi, Hena Das, Akihiko Machida, Tetsu Watanuki, Shigeo Mori, Koshi Takenaka, Masaki Azuma
Summary: Negative thermal expansion (NTE) in layered Ca2RuO4 exhibits intriguing physical properties, but the exact mechanisms behind this phenomenon are not yet fully understood. Recent research has revealed the structural characteristics of Ca2RuO4 and the electronic and orbital states that lead to both NTE and positive thermal expansion (PTE) phenomena.
CHEMISTRY OF MATERIALS
(2021)
Article
Physics, Multidisciplinary
Morise Karasawa, Yasunori Yokoyama, Kingo Takiguchi, Hiroshi Takahashi, Takashi Kikukawa, Masashi Sonoyama, Koshi Takenaka
Summary: The study investigated the relationship between pore size distributions in hydrogels immobilizing purple membrane (PM) and PM stacking. Results from optical microscopic observations showed that PM stacking occurred in porous gels with a larger pore size than PM long axis length, suggesting an appropriate pore size for PM stacking.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2021)
Article
Physics, Multidisciplinary
Yoshihiko Okamoto, Tomoya Kanematsu, Yuki Kubota, Takeshi Yajima, Koshi Takenaka
Summary: Localized moments of Cr3+ and Fe3+ ions in the spinel oxide LiFeCr4O8 lead to a significant volume increase when a magnetic field of 9T is applied, specifically at around 30K. The spin-reorientation transition from a ferrimagnetic order to a conical order is crucial for this large volume increase. This study suggests that such phenomenon can be realized at different magnetic transitions in localized magnets with strong spin lattice coupling.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Physics, Applied
K. Kishida, J. Shibutani, T. Hatano, Y. Yokoyama, N. Katayama, Y. Okamoto, Y. Nakamura, H. Kishida, H. S. Suzuki, K. Takehana, Y. Imanaka, K. Takenaka
Summary: This study systematically investigates the electrical-field-induced insulator-to-metal transition of samarium monosulfides. The experiment results show that the I-to-M transition occurs at liquid-nitrogen temperatures under a small electric field. However, the simultaneous measurement of I-V characteristics and strain did not detect the expected strain caused by the volume contraction. Reflectivity spectroscopy analysis revealed no spectral change during the field-induced transition, except for the temperature change due to Joule heat.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Yuki Kubota, Yoshihiko Okamoto, Tomoya Kanematsu, Takeshi Yajima, Daigorou Hirai, Koshi Takenaka
Summary: Sintered samples of Cr3Te4 and Cr2Te3 show large strains and volume changes under a magnetic field. The volume of Cr3Te4 increases by delta V/V = 500-1170 ppm when a magnetic field of 9 T is applied below 350 K. At room temperature, the delta V/V value exceeds 1000 ppm, which is larger than previously reported values for Cr-based magnets and comparable to forced-volume magnetostriction in invar alloys. Cr2Te3 exhibits a large delta V/V of 680 ppm when a magnetic field of 9 T is applied at 200 K. Both samples show significant volume increases around the Curie temperature, along with negative thermal expansion due to microstructural effects, suggesting the importance of the interaction between anisotropic lattice deformation and microstructural effects for the large magnetic-field-induced volume changes.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Yuki Nakayama, Yoshihiko Okamoto, Daigorou Hirai, Koshi Takenaka
Summary: The electrical resistivity, magnetic susceptibility, and heat capacity of sintered Ca2Ir2O7 samples were studied. The experimental data suggest that Ca2Ir2O7 is metallic at temperatures below room temperature and does not exhibit electronic or magnetic phase transitions above 0.12 K.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Materials Science, Multidisciplinary
Ryota Kasugai, Yoshifumi Kadowaki, Yasunori Yokoyama, Naoyuki Katayama, Yoshihiko Okamoto, Koshi Takenaka
Summary: This systematic investigation examines the specific effects of co-doping onto Zn sites in Mg-doped Zn2P2O7, shedding light on negative thermal expansion (NTE). The low-cost and low-environmental-impact NTE material Zn2_xMgxP2O7 exhibits significant NTE at x=0.4 in a temperature range that includes room temperature. Although Mg doping expands the operating-temperature window, it remains several dozen degrees wide. Additionally, the total volume change related to NTE decreases compared to the Zn2P2O7 parent material. Co-doping of Mg and another element onto the Zn site effectively achieves simultaneous expansion of the operating-temperature window and maintenance of the volume change related to NTE, as demonstrated by the example of Zn1.64Mg0.30Al0.06P2O7. This material exhibits a large negative coefficient of linear thermal expansion of approximately -65 ppm/K at temperatures of 300-375 K and shows better thermal expansion compensation capability than the composition without Al at temperatures higher than room temperature. The Al-doped phosphates are expected to have broad practical applications due to their performance, cost, and environmental load characteristics.
MATERIALS TRANSACTIONS
(2023)
Article
Physics, Multidisciplinary
Koki Eto, Yoshihiko Okamoto, Naoyuki Katayama, Hajime Ishikawa, Koichi Kindo, Koshi Takenaka
Summary: NaPrTe2, NaNdTe2, and NaTbTe2 are triangular lattice magnets with the alpha-NaFeO2 structure, where lanthanoid atoms with 4f electrons form a triangular lattice. The alpha-NaFeO2 structure is a new polymorph of NaPrTe2, which was previously thought to have a cubic LiTiO2 structure. NaPrTe2 is suggested to be of interest for dimensional control of geometrically frustrated lattices. Magnetic susceptibility and heat capacity data show that NaPrTe2 does not exhibit long-range magnetic order or spin-glass transition above 2 K.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Multidisciplinary Sciences
Rikizo Yano, Shota Nagasaka, Naoki Matsubara, Kazushige Saigusa, Tsuyoshi Tanda, Seiichiro Ito, Ai Yamakage, Yoshihiko Okamoto, Koshi Takenaka, Satoshi Kashiwaya
Summary: In CaAg1-xPdxP, Pd doping raises the Fermi level, increasing the critical temperature and resulting in unconventional superconductivity in the surface states. Ultrahigh mobility carriers derived from the surface generate a new class of unconventional superconductivity.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
M. Gen, H. Ishikawa, A. Ikeda, A. Miyake, Z. Yang, Y. Okamoto, M. Mori, K. Takenaka, H. Sagayama, T. Kurumaji, Y. Tokunaga, T. Arima, M. Tokunaga, K. Kindo, Y. H. Matsuda, Y. Kohama
Summary: This study reveals a complex magnetic phase diagram of CuInCr4S8 and discovers a small phase pocket (A phase) accompanied by anomalous magnetostrictive and magnetocapacitive responses, which may be related to the emergence of helimagnetism.
PHYSICAL REVIEW RESEARCH
(2022)
