6.
已知等差数列\(\{a_{n}\}\)的前\(n\)项和为\(S_{n}\),首项为\(1\)的等比数列\(\{b_{n}\}\)的公比为\(q\),\(S_{2}=a_{3}=b_{3}\),且\(a_{1}\),\(a_{3}\),\(b_{4}\)成等比数列.
\((1)\)求\(\{a_{n}\}\)和\(\{b_{n}\}\)的通项公式;
\((2)\)设\(c_{n}=k+a_{n}+\log _{3}b_{n}(k∈ N^{ + }),{若} \dfrac {1}{c_{1}}, \dfrac {1}{c_{2}}, \dfrac {1}{c_{t}}(t\geqslant 3)\)成等差数列,求\(k\)和\(t\)的值.