We have been measuring the bulk electrical and thermal properties of t
he quantum ferroelectric KTa0.992Nb0.008O3 (KTN) in the interest of ma
king a thermal sensor for a pyroelectric microcatorimeter. The pyroele
ctric coefficient and specific heat of KTN as a function of temperatur
e and electric field are given. The measurements indicate that a thin
film detector with the same pyroelectric coefficient as that found in
our sample would in principle be able to operate in a phonon noise lim
ited regime over a wide bandwidth.