Yttrium chromite chromia thermistors
AssigneeKeystone Thermometrics, Inc.
InventorDavid J. Sorg
Life of this patent
Estimating the term…
Abstract
Rare earth elemental thermistors and compositions useful for making such thermistors. In particular, it relates to yttrium and chromium oxide based thermistor systems having at least two phases: YCrO3 and Cr2O3 and their use for measuring temperature.
Claims11
A thermistor capable of accurately measuring a change in temperature over a wide temperature range comprising a ceramic composition including X wherein x is a rare earth metal, and a stoichiometric excess of Cr, said ceramic composition including at least a first phase having the formula XCrO3 and at least a second phase having the formula Cr2O3, and a plurality of electrical contacts suitable for placing said ceramic material in electrical contact with a circuit or device.
A thermistor capable of accurately measuring a change in temperature over a wide temperature range comprising a ceramic composition including X wherein x is a rare earth metal, and a stoichiometric excess of Cr, and further including at least a first phase having the formula XCrO3 and at least a second phase having the formula Cr2O3, Ti provided in an amount of between about 1 and about 8 mole %, based on the total content of metals in the ceramic composition, Si provided in an amount of between about 0.5 and about 6 mole %, based on the total content of metals in the ceramic composition, Ca provided in an amount of between about 0.5 and about 6 mole %, based on the total content of metals in the ceramic composition, and a plurality of electrical contacts suitable for placing said ceramic material in electrical contact with a circuit or device.
A thermistor capable of accurately measuring a change in temperature over a wide temperature range comprising a ceramic composition including X wherein x is a rare earth metal, and a stoichiometric excess of Cr, and further including at least a first phase having the formula XCrO3 and at least a second phase having the formula Cr2O3, and further including Ti provided in an amount of between about 3 and about 5 mole %, based on the total content of metals in the ceramic composition, Si provided in an amount of between about 2 and about 3 mole %, based on the total content of metals in the ceramic composition, Ca provided in an amount of between about 2 and about 3 mole %, based on the total content of metals in the ceramic composition, and a plurality of electrical contacts suitable for placing said ceramic material in electrical contact with a circuit or device.
A thermistor capable of accurately measuring a change in temperature over a wide temperature range comprising a ceramic composition Y and a stoichiometric excess Cr, said ceramic composition including at least a first phase having the formula YCrO3 and at least a second phase having the formula Cr2O3, and a plurality of electrical contacts suitable for placing said ceramic material in electrical contact with a circuit.
Dependencies are inferred from the claim text.