Nd2Ti2O7 (NTO) with high curie temperature (TC) for high temperature sensor applications

Sivagnanapalani, P.; Ansari, Naveed Iqbal; Panda, P. K.

doi:10.1016/j.sintl.2021.100093

Cited by 12 publications

(4 citation statements)

References 23 publications

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“…From the theory the LTO possess to 132 (3n) normal modes of vibrations and 129 (3n-3) optical modes. Raman active modes the optic modes obey to Γoptic =65A+64B and acoustic modes Γacoustic = A + 2B (Sivagnanapalani et al, 2021). The spectrum divided sections for detailed analysis.…”

Section: Raman Spectroscopymentioning

confidence: 99%

“…Here Ln 3+ is A site cation and Ti 4+ is B site cation and these structures are complex (Gao et al, 2017;2013;Wang et al, 2010;2022;López-Pérez & Íñiguez, 2011;Hwang et al, 2003;Yamamoto et al, 1980;Nanamatsu et al, 1974). As a member of AnBnO3n+2 (n=4) family Ln-Ti-O (Ln =La, Nd, Pr) ternary systems are possess only PL structure (Sivagnanapalani et al, 2021). Some perovskite compounds are characterized by their non-centrosymmetric crystal symmetry and monoclinic structure, where their respective space group is P21.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of a noncentrosymmetric crystal symmetry is a prerequisite for the ferroelectricity of these compounds, with transition temperatures of 1461, 1482 and 1750 0 C for La2Ti2O7, Nd2Ti2O7 and Pr2Ti2O7, respectively (Patwe et al, 2015). PL structure is characterized with corner shared BO6 octahedrons and 12-coordinated A cations thus perovskite like layers separated by oxygen rich gaps which are linked by A cations at their boundaries and this structure considered as a cutting the cubic perovskite ABO3 structure along [110] direction followed by an insertion of additional oxygen (Gao et al, 2017;Nanamatsu et al, 1974;Sivagnanapalani et al, 2021). The La2Ti2O7 is translucent.…”

Section: Introductionmentioning

confidence: 99%

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VIBRATIONAL AND X-RAY MEASUREMENTS OF La2Ti2O7 UNDER HIGH PRESSURE CONDITION

Asadov

2024

APR

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The present study focuses on investigating the impact of high-pressure conditions on the crystal structure and vibration spectra of the perovskite-like layered compound La2Ti2O7. To this end, X-ray diffraction and Raman spectroscopy techniques were employed to observe the behavior of the compound under pressure levels up to 30 GPa. The neutron diffraction at ambient pressure confirms that the structure of La2Ti2O7 is monoclinic P21. The results indicate that when the pressure attains 17.3 GPa, the original monoclinic phase of P21 symmetry undergoes a phase transition to the monoclinic phase of P2 symmetry. The observed pressure-induced phase transitions in La2Ti2O7 are associated with anomalous changes in both the unit cell parameters and the vibrational modes. Additionally, the study obtained the baric dependences of lattice parameters, unit cell volume and vibration frequencies, which were used to calculate the bulk modules for the initial and pressure-induced phases of La2Ti2O7.

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Section: Raman Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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VIBRATIONAL AND X-RAY MEASUREMENTS OF La2Ti2O7 UNDER HIGH PRESSURE CONDITION

Asadov

2024

APR

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“…[ 22 ] Once again the same resistive principle was exploited by Sivagnanapalani et al, who were successful in obtaining powder precursor material Nd 2 Ti 2 O 7 (NTO) and its processing technique, with the characteristic to be utilized in high‐temperature sensors based on perovskite‐like layered structured, illustrating a resistance drop from 10 14 to 10 6 Ω cm with an increase in temperature from 100 to 900 °C. [ 23 ] In contrast to the abovementioned sensor specification, Alpert et al showed rigid solid‐state sensors manufactured using InAlN/GaN and AlGaN/GaN heterostructures, where the increase of temperature from room temperature to 576 °C was detected by the decreasing voltage‐scaled magnetic field, as an electronic effect arising from the decreasing electron mobility due to the scattering effect. [ 24 ] Some of the above mentioned works cannot be compared directly to our research focus in this manuscript, as we concentrate on a broad range of temperature, represent printed sensors, and intend to follow the principle of electrical capacitance for our measurements.…”

Section: Introductionmentioning

confidence: 99%

Inkjet‐Printed Flexible Thin‐Film Thermal Sensors for Detecting Elevated Temperature Range

Mitra,

Thalheim

et al. 2023

Physica Status Solidi (a)

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All inkjet‐printed thermal sensors are manufactured based on a metal–insulator–metal (MIM) interface or capacitor architecture, for the adapted device size ranging from 16 to 36 mm2 active area. Two different material inks, namely a nanoparticle conductive silver ink and an inorganic‐polymer‐based hybrid insulator ink, are applied layer by layer on a thin flexible polyimide substrate, for developing the printed MIM devices. To ensure the desired electronic conductivity and insulation from the layers, the manufacturing process steps and parameters are tuned, accordingly. The results show that the inkjet‐printed MIM devices could constitute up to 15 μm thickness and demonstrate average detection of a change in electrical capacitance ranging from 20 to 100 pF, when the temperature is varied between 100 and 300 °C. The investigations also summarize that the change in the electrical response is enough to detect an increment of 50 °C. The printed sensors also display high operational stability and repeatability, when subjected to thermal cycling.

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