Premium
Humidity‐sensitive characteristic of Ba 0.99 La 0.01 SnO 3
Author(s) -
Upadhyay Shail
Publication year - 2008
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200723006
Subject(s) - analytical chemistry (journal) , scanning electron microscope , porosity , relative humidity , materials science , thermogravimetric analysis , fourier transform infrared spectroscopy , conductivity , capacitance , conductance , humidity , mineralogy , chemistry , chemical engineering , composite material , chromatography , physics , mathematics , organic chemistry , electrode , combinatorics , engineering , thermodynamics
Samples of Ba 0.99 La 0.01 SnO 3 (abbreviated name BSL01) have been synthesized by a solid‐state ceramic route at 1200 °C for 4 h. Synthesized powders have been characterized using techniques such as X‐ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X‐ray analysis (EDXA). From XRD data, single‐phase solid‐solution formation has been confirmed. SEM of the sample exhibited a porous nature with small grain size in the range 0.2–0.4 μm. EDXA showed that the surface of the sample is barium deficient and oxygen rich. The distribution in pore size, average pore diameter and% porosity were obtained from the mercury‐intrusion method. The average pore diameter and% porosity are 0.34 μm and 26, respectively. At room temperature the effect of humidity on conductance and capacitance in the frequency range 20 Hz – 1 MHz and relative humidity (RH) range 10–95% have been measured. It is observed that frequency has more influence on capacitance as compared to resistance. The variation of conductivity with RH is linear whereas of the capacitance is nonlinear. The response and recovery times are 44 s and 56 s, respectively. The hygroscopic nature of the sample has been supported by Fourier transforms infrared (FTIR) and thermogravimetric analysis (TGA) data. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)