Quantum‐ferroelectric pressure sensor for use at low temperatures

A small, multilayer capacitance sensor (∼70 mm3) for measuring pressure over a broad range at low temperatures is described. The dielectric material is a quantum ferroelectric in the (Cd, Pb)2(Nb, Ta)2 O7 ceramic system, and the reciprocal capacitance varies linearly with pressure into the kilobar r...

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Veröffentlicht in:	Rev. Sci. Instrum.; (United States) 1985-10, Vol.56 (10), p.1913-1916
Hauptverfasser:	Lawless, W. N., Clark, C. F., Samara, G. A.
Format:	Artikel
Sprache:	eng
Schlagworte:	440300 - Miscellaneous Instruments- (-1989) Analysing. Testing. Standards Applied sciences CADMIUM COMPOUNDS CALIBRATION CAPACITANCE CERAMICS CHALCOGENIDES CRYOGENICS DIELECTRIC MATERIALS ELECTRICAL EQUIPMENT ELECTRICAL PROPERTIES ELECTROMAGNETS Exact sciences and technology FABRICATION FERROELECTRIC MATERIALS Industrial metrology. Testing Instruments, apparatus, components and techniques common to several branches of physics and astronomy LEAD COMPOUNDS MAGNETIC FIELDS MAGNETS MATERIALS Measurement of properties and materials state MEASURING INSTRUMENTS Mechanical engineering. Machine design Mechanical instruments, equipment and techniques Metals. Metallurgy NIOBIUM COMPOUNDS NIOBIUM OXIDES Nondestructive testing OTHER INSTRUMENTATION OXIDES OXYGEN COMPOUNDS PHYSICAL PROPERTIES Physics PRESSURE GAGES PRESSURE MEASUREMENT REFRACTORY METAL COMPOUNDS SENSITIVITY SIZE SUPERCONDUCTING DEVICES SUPERCONDUCTING MAGNETS TANTALUM COMPOUNDS TANTALUM OXIDES TRANSITION ELEMENT COMPOUNDS ULTRALOW TEMPERATURE
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Zusammenfassung:	A small, multilayer capacitance sensor (∼70 mm3) for measuring pressure over a broad range at low temperatures is described. The dielectric material is a quantum ferroelectric in the (Cd, Pb)2(Nb, Ta)2 O7 ceramic system, and the reciprocal capacitance varies linearly with pressure into the kilobar region. The average sensitivity of the devices studied is 151 pF/kbar, and the sensor is essentially independent of both intense magnetic fields and temperature below 10 K. A calibration for the slight magnetic field effect is given, and the sensor is dielectrically stable at helium temperatures. A one‐point pressure calibration is estimated to be reliable to
ISSN:	0034-6748 1089-7623
DOI:	10.1063/1.1138444