Perovskite layered materials with A2B2O7 structure such as Ca2Nb2O7, Sr2Nb2O7, Nd2Ti2O7, La2Ti2O7, Sm2Ti2O7 and Pr2Ti2O7 possess very high Curie temperature (Tc > 1000°C). The above materials in powder form were synthesised using mixed oxide method by calcining well-mixed constituent powders between 1000°C and 1300°C for 2 h. Circular disc samples of 12 mm diameter were prepared and sintered at 1200–1450°C, with a soaking duration of 2 h. The sintered density, X-ray diffractometer, scanning electron microscope and electrical resistivity were measured for all samples. The samples experience a linear decrease in electrical resistivity from 1013 to 105 Ω.cm as temperature increases between 100 and 900°C. In this paper, a comparative study on electrical resistivity for the above materials was carried out to determine their suitability for sensing applications at high temperatures.
BoyceMP. Gas turbine engineering handbook. 3rd ed.Texas, USA: Gulf Professional Publishing, 2006.
2.
GongXAnLXuC. Wireless passive sensor development for harsh environment applications. In: IEEE International Workshop on Antenna Technology, Tucson, AZ, 2012.
3.
TregayGWCalabresePRKaplinPL,et al.Optical fiber sensor for temperature measurement from 600 to 1900 °C in gas turbine engines. In: Proceedings of SPIE: The International Society for Optical Engineering, 1991, vol. 1589, pp.38–47.
4.
TomokiTKojiSYoshihikoO,et al.Temperature measurement of high speed rotating turbine blades using a pyrometer. In: Proceedings of ASME Turbo Expo: Power Land, Sea, Air, 2006, vol. 2, pp.521–529.
5.
LutzSSTurleyWDBorellaHM, et al.Remote temperature measurement instrumentation for a heated rotating turbine disk. In: Proceedings of the International Instrumentation Symposium, vol. 34, 988, pp.217–229.
6.
BhattacharyaASrinivasa RaoRGhanashyam KrishnaM. Characterization of Yb2O3 based optical temperature sensor for high temperature applications. Sens Actuators A2007; 134: 348–356.
7.
ZhangSYuF. Piezoelectric materials for high temperature sensors. J Am Ceram Soc2011; 94: 3153–3170.
8.
NanamatsuSKimuraMKawamuraT. Crystallographic and dielectric properties of ferroelectric A2B2O7 (A=Sr, B=Ta, Nb) crystals and solid solutions. J Phys Soc Jpn1975; 38: 817–824.
9.
NingHYanHReeceMJ. Piezoelectric strontium niobate and calcium niobate ceramics with super-high curie points. J Am Ceram Soc2010; 93: 1409–1413.
10.
SivagnanapalaniPSahooBPandaPK. Calcium niobate based piezo-resistive materials for high temperature sensor application. Ceram Int2018; 44: 20348–20353.
11.
YanHReeceMJLiuJ, et al.Effect of texture on dielectric properties and thermal depoling of Bi4Ti3O12 ferroelectric ceramics. J Appl Phys2006; 100: 076103–3.
12.
SivagnanapalaniPAnsariNIPandaPK. Nd2Ti2O7 (NTO) with high Curie temperature (TC) for high temperature sensor applications. Sensor Int2021; 2: 100093.
13.
YanHNingHKanY, et al.Piezoelectric ceramics with super-high curie points. J Am Ceram Soc2009; 92: 2270–2275.
14.
ScheunemannKMuller-BuschbaumHK. Zur kristallstruktur von Sr2Nb2O7. J Inorg Nucl Chem1975; 37: 1679–1680.
15.
IshizawaNMarumoFIwaiS, et al.Compounds with perovskite-type slabs. V. A high-temperature modification of La2Ti2O7. Acta Crystallogr B1982; 38: 368–372.
16.
MarzulloSBuntingEN. Dielectric properties of titania or tin oxide containing varying proportions of rare-earth oxides. J Am Ceram Soc1958; 41: 40–41.
LichtenbergFHerrnbergerAWiedenmannK. Synthesis, structural, magnetic and transport properties of layered perovskite-related titanates, niobates and tantalates of the type AnBnO3n+2, A′Ak−1BkO3k+1 and AmBm−1O3m. Prog Solid State Chem2008; 36: 253–387.
19.
LichtenbergFHerrnbergerAWiedenmannK,et al.Synthesis of perovskite-related layered AnBnO3n+2 = ABOX type niobates and titanates and study of their structural, electric and magnetic properties. Prog Solid State Chem2001; 29: 1–70.
20.
IsupovVA. Crystal chemical aspects of the layered perovskite-like oxide ferroelectrics of the AnMnO3n 2 type. Ferroelectrics1999; 220: 79–103.
21.
SivagnanapalaniPAnsariNIPandaPK. Calcium bismuth titanate with high Curie temperature (Tc) for high temperature sensor applications. J Electron Mater2021; 50: 4806–4811.
22.
GaoZYanHNingH,et al.Ferroelectricity of Pr2Ti2O7 ceramics with super-high curie point. Adv Appl Ceram2013; 112: 69–74.
23.
AnsariNISivagnanapalaniPSureshkumarV, et al.Synthesis of lanthanum titanate (La2Ti2O7) for high temperature sensor applications. J Mater Sci Mater Electr2021; 32: 27422–27428.
24.
SivagnanapalaniPPandaPK. Synthesis of samarium titanate (Sm2Ti2O7) for high temperature sensor applications. Sens Int2022; 3: 100200.
25.
SivagnanapalaniPSahooBPandaPK. Study on strontium niobate based piezo-resistive materials for high temperature and high pressure sensor applications. ISSS J Micro Smart Syst2019; 8: 25–30.
26.
AngCGuoRBhallaAS,et al.Dielectric relaxation behavior and high tunability in Cd2Nb2O7. Integr Ferroelectr2002; 42: 419–431.
27.
PandaPKJaleelVAUsha DeviS. Hydrothermal synthesis of boehmite and α-alumina from Bayer’s alumina trihydrate. J Mater Sci2006; 41: 8386–8389.
